M05 Q&A

MODULE 5 Digital Techniques / Electronic Instrument Systems

1. provides

An FMS system, besides controlling navigation, thrust and auto-nav, also a) b) c)

take-off and landing warnings dedicated status and warnings GPWS warnings

The correct answer is b The FMS is not used for Take Off or Landing The GPWS warnings come from the GPWS Computer 2.

EADI sky and ground display is provided by a) synthetic TV signals b) raster scan c) stroke pulse

The correct answer is b Pallett - Aircraft Instruments Page 302 Fig. 12.5 3.

HSI heading is valid if the heading flag is a) in view b) green c) out of view

The correct answer is c Warning flags 'in view' indicate failure. Normally the only coloured flag used is RED, indicating failure 4.

A NOR gate with both inputs inverted becomes a a) NAND gate b) AND gate c) OR gate

The correct answer is b Read up on logic gates - you need to know much more than you needed for Module 4 5.

An ARINC 429 binary coded decimal data word occupies bits a) 11 to 28 b) 11 to 29 c) 1 to 8

The correct answer is b Pallett - Aircraft Instruments Page 159 6.

A fibre optic cable consists of a) a plastic core with a cladding having a higher refractive index b) a silica glass core with a cladding having a higher refractive index c) a silica glass core with a cladding having a lower refractive index

The correct answer is c See www.commspecial.com/fiberguide 7.

The command bars on an ADI relate to a) path required b) path being followed c) roll indications

The correct answer is a Pallett - Aircraft Instruments Page 212 8.

The recording medium in an FDR is a) a high density floppy disc b) magnetic tape coated with ferrite c) copper foil coated with ferrite

The correct answer is b See www.l-ar.com/html/history.html 9.

Convert 0111012 to octal a) 25 b) 33 c) 35 The correct answer is c The OCTAL code has 8 digits, 0 - 7. To convert binary to octal divide the binary number into groups of three starting from the right. You've got to know your binary, octal, hex and bcd conversions!

10.

What does the CADC feed a) Altimeter / FMS / secondary radar b) standby altimeter / machmeter c) cabin pressure controller sensor / machmeter / altimeter

The correct answer is c Pallett - Aircraft Instruments Page 179 Fig. 7.12

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1.

ARINC 629 databus is a) one cable, bi-directional b) two cables, bi directional c) two cables, uni-directional


Requirements for software control can be found in a) AWN 45 b) JAR OPS c) JAR AWO

The correct answer is a AWN 45 has been deleted at issue 133, but the examiners may not know that! (Sinicism, surely not!) 3.

Software can be modified by a) licensed avionics engineers b) the manufacturer c) The same rules apply as to modifications to hardware

The correct answer is c Read up on software control - get a copy of AWNs 4. called

Two connected fibre optic cable ends are parallel but not quite touching. This is a)

lens connector

b) c)

end to end coupling end fire coupling

The correct answer is b There are several websites on fibre optics 5.

A disadvantage of a fibre optic cable is a) shallow bend radius allowed b) couplings susceptible to ingress of fluid c) end terminals are susceptible to environmental contamination

The correct answer is c www.commspecial.com/fiberguide.htm 6.

The inside of a CRT consists of a) an oxide coating and rare mercury gas b) a phosphor coating and rare mercury gas c) iodine and rare mercury gas


What kind of light is used in a fibre optic systems? a) Infrared b) Visible c) Ultraviolet

The correct answer is a www.floti.bell.ac.uk/MathsPhysics/light.htm 8.

Typical displays on an EHSI are a) VOR, Map, Plan and weather radar b) VOR, Plan, Map and Attitude c) Engine indications

The correct answer is a Pallett - Aircraft Instruments Pages 302 & 304 9. An EADI display showing a moving runway moves down during the final stages of an approach. The aircraft must a) fly up b) fly down c) hold descent path The correct answer is b At 200ft, during Approach, the Rising Runway starts to move up the EHSI display until, at touch down, it touches the bottom of the aircraft symbol. If the Rising Runway start to move down again it means that the aircraft is climbing and should FLY DOWN 10.

An ARINC 573 data bus is used a) to input into a Digital Flight Data Recorder b) to input into a FDR Digital Acquisition Unit c) to supply digital inputs from a Symbol Generator to the EADI and EHSI The correct answer is a The FDR can have different inputs depending upon the age of the system, modern systems use ARINC 573. The inputs to FDR DAU are only analogue, discreet and ARINC 429. The interface between SGUs, EADI and EHSI is only ARINC 429

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1.

A flight data recorder can obtain information from aircraft instruments a) provided there is adequate isolation b) by direct connection to the instruments c) provided there is adequate damping The correct answer is a Read up on Flight Data recording 2.

Adding invertors to the two inputs of an AND gate makes a a) NAND gate b) OR gate c) NOR gate

The correct answer is c Read up on logic gates - you need to know much more than you needed for Module 4! 3.

An ARINC 429 bus uses a) a twisted shielded pair of wires b) two bi-directional twin sheathed and earthed wires c) a single twin wire cable for each transmitter

The correct answer is a Pallett - Aircraft Instruments Page 157 4.

CRT horizontal beam control is achieved by a a) square wave b) sawtooth wave c) sinusoidal wave

The correct answer is b Northrop Institute of Technology - Electricity & Electronics for Aerospace Vehicles Page 284 5.

The ARINC 429 data bus word systems use a) decimal numbering b) hexadecimal numbering c) binary coded decimal

The correct answer is c Pallett - Aircraft Instruments Page 156 6.

The binary number 11010111 expressed as a decimal is a) 207 b) 223 c) 215

The correct answer is c Learn binary, octal, hex and BCD conversions 7.

The octal number 1001 expressed as a decimal is a) 65 b) 513 c) 9

The correct answer is b Learn binary, octal, hex and BCD conversions

8. A 0 1

This truth table is for a B 0 0

C 0 0

0 1

1 1

0 1 a) b) c)

NAND gate AND gate OR gate

The correct answer is b Read up on logic gates - you need to know much more than you needed for Module 4! 9.

The inputs and outputs of a CADC are a) pitot and static in; altitude, attitude, CAS and VS out b) pitot and static in; altitude, CAS, mach and VS out c) pitot in; static, altitude, mach, CAS and VS out

The correct answer is b Pallett - Aircraft Instruments Page 179 Fig. 7.12 10.

EICAS provides the following a) engine parameters only b) engine parameters and system warnings only c) engine parameters and engine warnings only

The correct answer is b Pallett - Aircraft Instruments Page 377

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1. During an instrument approach, the glideslope pointer deflects below the glideslope centre mark. This means the aircraft is positioned a) above the glideslope b) below the glideslope c) to the left of the localiser The correct answer is a Consider the centre of the G/S scale as the aircraft position and the pointer as the centre of the G/S beam 2.

Engine parameters are displayed on a) ECAM b) EHSI c) FMSCDU

The correct answer is a Engine parameters can be displayed on ECAM by selecting the Engine Page. See Pallett - Aircraft Instrumnets and Integrated Systems Page 391 3.

A central maintenance computer provides a) ground and flight monitoring and testing on an on-board computer b) ground and BITE testing using a portable control panel c) display of system warnings and cautions

The correct answer is a Read up on BITE systems 4.

ARINC 573 is related to what system? a) INS b) FDR c) Weather Radar

The correct answer is b Boeing Maintenance Training notes for B757 5.

The rising runway is positioned from information derived from a) barometric height b) vertical speed c) radio altimeter

The correct answer is c Boeing Maintenance Training notes for B757 6.

Where are the Digital Flight Data Recorder outputs supplied to? a) The recording unit b) Flight instruments c) There are no outputs

The correct answer is c Information recorded in the DFDR is only accessable in the shop 7.

FMS failure and warnings are a) displayed on EICAS b) engine warnings only c) EFIS warnings only

The correct answer is a FMS warnings are displayed on EICAS and EFIS, but the answers given are 'EICAS' or 'EFIS only' so for the purposes of this question the correct answer is EICAS 8.

Who is responsible for the operational program of the FMS? a) The pilot b) The engineer c) The manufacturer

The correct answer is a Ambiguous question. Do they mean who is responsible for following the program, if so the answer is 'Pilot' or producing the program, then the answer is 'Manufacturer' 9.

Flight director command bars are moved to the correct position by a) position feedback b) amplifier gain c) calibration

The correct answer is a Read up on the flight director indication system 10.

If a signal has quantity in volts and physical position it is a) digital b) synchronous c) analogue The correct answer is c This is the definition of an analogue signal

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1. In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement? a) Vertical b) No movement c) Horizontal

The correct answer is a The Y plates lie horizontal. Use the right hand rule to work out the direction of electron beam movement. Aircraft Instruments & Integrated Systems, Pallett, page 287 2.

What is the fixed feature of an ADI? a) The glideslope pointer b) The lateral deviation bar c) The aircraft symbol

The correct answer is c The little aeroplane pianted in the middle of the instrument 3.

Primary colours of a CRT are a) red, green and blue b) red, green and yellow c) red, blue and yellow

The correct answer is a Rotor Gear Box 4. What information is required before completion of the alignment of an Inertial Navigation System? a) Aircraft present position b) Aircraft present position and heading c) Heading and attitude The correct answer is a Read up on INS 5.

IRS accelerometers are mounted a) 60o to each other b) 45o to each other c) 90o to each other The correct answer is c Read up on IRS

6.

An FMS navigation database is updated a) at the operators request b) once a month c) every 28 days The correct answer is c Read up on FMS navigation data management

7.

A single failure of a fly-by-wire system a) has no effect on aircraft operation b) will limit the flight profile c) will reduce operational heights and speeds

The correct answer is a Redundant FBW systems will continue to fly the aircraft 8.

Fly-by-wire load alleviation function in turbulent conditions will result in a) ailerons moving symmetrically upwards b) ailerons and spoilers moving symmetrically upwards c) spoilers moving symmetrically upwards

The correct answer is b Read up on Load Alleviation system Ailerons move symmetrically upwards and No 4 and 5 spoilers move symmetrically upwards in a gust. 9.

Fly-by-wire roll control is achieved by

a) b) c)

ailerons spoilers spoilers and ailerons

The correct answer is c Automatic Flight Control, Pallett and Coyle Page 296 10.

The movement of fly-by-wire control surfaces are a) hydraulically controlled and electrically actuated b) both electrically controlled and electrically actuated c) electrically controlled and hydraulically actuated

The correct answer is c Read up on FBW systems

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1.

ARINC 629 current mode couplers are a) capacitive b) resistive c) inductive

The correct answer is c Read up on ARINC 629 and 429 2.

On an EADI, the Flight Director command bars show a) the actual path with respect to the required path b) the required path with respect to the actual path c) the path with respect to the horizon

The correct answer is b Read up on ILS system indication 3.

What instrument includes a display of a rising runway? a) EADI b) EHSI c) ECAM

The correct answer is a Read up on ILS system indication 4.

What are the effects of the X and Y plates on a CRT? a) X plates move the beam vertically, Y plates move the beam horizontal b) Y plates move the beam vertically, X plates move the beam horizontal c) X and Y plates can move the beam in either direction

The correct answer is b Read up on CRTs 5.

ARINC 629 data bus is a) two buses, unidirectional b) two buses, bi-directional data flow c) one bus, bi-directional data flow

The correct answer is c Read up on ARINC 629 and 429 6. provides

An FMS system, besides controlling navigation, thrust and auto-nav, also a) b)

take-off and landing warnings dedicated status warnings

c) GPWS warnings The correct answer is b Read up on FMS

7. In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed a) 1 megohm b) 1 ohm c) 0.05 ohm The correct answer is b CAAIPs Leaflet 9-1 8. protected by

Ribbon cables effected by mutual impedance and current loop leakage should be a) b) c)

shielding each individual conductor connecting all conductors to a common earth earthing each alternative conductor to separate point

The correct answer is c Read up on cable protection methods 9.

EADI sky and ground display is provided by a) synthetic TV signals b) raster scan c) stroke pulse

The correct answer is b Read up on CRTs and see what a raster scan is 10.

Normal transmission order of ARINC 629 LRUs in periodic mode is in order of a) power up b) shortest to largest TG c) shortest to largest TI

The correct answer is b Aircraft Electricity and Electronics Eismin Page 149

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1.

What frequency creates the raster effect on a CRT? a) 50/60 Hz b) 400 Hz c) 250Hz

The correct answer is a Read up on CRTs 2. generator?

If an EFIS has 3 symbol generators, what is the purpose of the 3rd symbol a) b) c)

Comparison with No.1 symbol generator Standby Parity function

The correct answer is b Read up on EFIS 3.

The sweep waveform used on a electromagnetic CRT is a) trapezoidal

b) c)

sinusoidal sawtooth

The correct answer is a Do not get confused with an electrostatic CRT. Electromagnetic CRT uses trapezoidal waveform to overcome the impedence of the coil 4.

FMS operational program is updated every a) 7 days b) 28 days c) 90 days

The correct answer is b Read up on FMS 5.

Fibre optic data is sent by a) modulating the frequency of a laser beam b) modulating the frequency of a filament beam c) a strobe light

The correct answer is a Read up on fibre optics 6.

What is 345 in binary? a) 100111001 b) 110011001 c) 101011001

The correct answer is c You've got to know your binary, octal, hex and bcd conversions! 7.

Which logic gate can be represented as a parallel circuit? a) OR gate b) Exclusive OR gate c) NAND gate The correct answer is a Read up on logic gates - you need to know much more than you needed for Module 4!

8.

Software documentation procedures are laid down in a) AWN 45 b) JAA Ops c) MOE

The correct answer is a AWN 45 has been deleted at issue 133, but the examiners may not know that! (Sinicism, surely not!) 9.

HIRF is prevented from entering a fibre optic cable by a) enclosing it in a metal braid b) grounding the fibre at both ends c) using an opto-isolator coupling

The correct answer is c Although a fiber optic cable is 'immune' from collecting HIRF, it can still transmit HIRF which has been picked up by the source circuitry. An optoelectronic isolator will filter out the HIRF prior to transmission. 10.

In an ARINC 429 wordstring, bits 1 to 8 represent the a) source of message b) monitored parameter c) destination LRU address

The correct answer is b Both a and b are correct. Aircraft Instruments and Integrated Systems Pallett Page 158 says 'source of the message', whereas ARINCs own tutorial (See FORUM Mod.5) says 'bits 8-1 contain parameter' (which Pallett's book also infers on Page 159).

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1.

ARINC 629 terminal transmit interval is a) unique to each terminal b) common to each terminal c) when all terminals are quiet

The correct answer is b The ARINC 629 TI is common to all LRUs. 2.

Continuity of a fibre optic cable is checked by a) a light source and an opto-power meter b) a calibrated light source c) a calibrated light source and an optometer

The correct answer is c See http://www.tpub.com/neets/tm/109-13.htm 3.

To shield a fibre optic from EMI you must a) earth both transducer and couplings b) shield it with a braided shield c) use an opto-isolator

The correct answer is c Read up on fibre optics 4.

A simbol generator displays ESDs warning. During replacement a) you must wear a wrist strap connected to an approved earth point b) make sure the pins are not touched and covers fitted c) you must earth the unit to the airframe structure

The correct answer is b See Pallett's Micro Electronics In Aircraft Systsems or CAAIPs 9-4 para.7.1.3. 5.

Magnetic deflection on a CRT is achieved by a a) sawtooth waveform b) trapezoidal waveform c) sinusoidal waveform

The correct answer is b Read up on CRTs - do not get confused with electrostatic deflection types - which are more common on aircraft 6.

An FDR fitted to a helicopter begins recording a) on take-off b) on engine start-up c) when power is applied to the aircraft

The correct answer is b See ANO Art 53 para.1 7.

MIL-ST-1533 is a data bus for a) Flight Data Recorders b) Inertial Reference System c) Digital Information Transfer System

The correct answer is c Read up on MIL-ST-1533 - a military version of ARINC 429 8.

Making an invertor from a NAND or NOR gate is achieved by a) inverting the input b) connecting two in series c) connecting the inputs

The correct answer is c Read up on logic gates 9.

Parallel to series conversion is achieved by a) a parallel to series converter b) a shift register c) a multiplexer / demultiplexer

The correct answer is b Read up on parallel to series converion 10.

The FMS databases consist of a) one navigation and one performance database b) two performance and one navigation database c) one performance and two navigation databases The correct answer is c Normally we consider the FMS as having 2 databases (1 navigational and 1 performance). (Jeppesen Avionics Fundamentals Page 385). However, the Navigational database is split in two. 1 is for Jeppesen data, uploaded on the ground, the other is for pilot input data (additional waypoints etc.). See http://www.b737.org.uk/fmc.htm for more

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1.

The FMS can update the IRS position outputs by using information from either a) VOR and DME only b) DME and GPS only c) GPS, DME, LOC and VOR

The correct answer is c Read up on INS/IRS 2.

The accepted error from INS/IRS is a) 1 mile/hour + 3 miles b) 2 miles per hour + 3 miles c) 3 miles / hour + 3 miles

The correct answer is c Read up on INS/IRS 3.

Before a) b) c)

an IRS can complete the alignment sequence the shutdown present position must be entered the current present position must be entered either the last or current position must be entered

The correct answer is b Read up on INS/IRS 4.

Within a computer controlled flight system, position feedback is converted from a) analogue to digital b) digital to analogue c) position feedback to rate feedback

The correct answer is a Read up on computer controlled flight 5. What shape does the waveform take to counter the impedance effect of the coils in an electromagnetic controlled CRT? a) Trapezoid b) Sawtooth c) Rectangular The correct answer is a Read up on CRTs - do not get confused with an electrostatic CRT

6.

What warnings can an FMS provide? a) Discrete warnings b) Spurious faults c) Ground faults only

The correct answer is a This means it can warn of inoperative equipment, but not when equipment is providing incorrect data 7.

Centralised Aircraft Monitoring System a) performs in-flight and ground tests of aircraft systems by carrying out a BITE interrogation b) give red warnings and amber cautions to display system status c) performs in-flight BITE interrogation only The correct answer is b Read up on ECAM 8. The control of the speed or rate that the flight director command bars move can be controlled by a) position feedback b) rate or velocity feedback c) amplifier gain The correct answer is b Read up on ILS indication

9. operation

The Centralised Aircraft Monitoring System uses the maintenance mode of

a) in the air only b) on the ground only c) either in the air or on the ground The correct answer is b Aircraft Electricity and Electronics, Eismin, 5th Edition Page 359

10.

The third EFIS Symbol Generator is operated a) with EICAS b) in an emergency c) as a standby to the No1 and No2 system The correct answer is c Read up on EFIS

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1.

What functions are available on the EHSI? a) Full arc and Wx only b) Full arc, Wx and Map Mode c) Full Arc only

The correct answer is b Read up on EFIS 2. EFIS displays of the right hand and left hand displays are compared by comparators in the a) FMS b) EICAS c) Symbol Generators The correct answer is c Read up on EFIS 3.

What is the approximate earth rate? a) 5o/hour b) 10o/hour c) 15o/hour

The correct answer is c Aircraft Instruments and Integrated Systems. Pallett Page 102 4.

An IRS platform has a) two accelerometers b) three accelerometers c) two or three accelerometers depending on the system

The correct answer is b Jeppesen Avionics Fundamentals Page 137 5.

IRS Laser Ring Gyros provide a) rate movement about an axis b) displacement about an axis c) both rate and displacement about an axis

The correct answer is a Jeppesen Avionics Fundamentals Page 137 6.

What are the outputs of a Digital ADC a) TAS, MACH, Altitude, TAT and SAT b) TAS, MACH and Altitude c) TAS, MACH, Altitude and TAT The correct answer is a Both Static and Total Air Temperatures are outputs of a digital ADC

7.

ARINC 629 periodic mode is used for a) normal operation b) transferring data only on events important to aircraft operation c) database loads

The correct answer is a Read up ARINC 429 and 629 8.

A fibre optic data bus used on an aircraft a) connects non-essential systems only b) can transmit on several channels at the same time c) can send only one message at a time

The correct answer is b Read up on fibre optics 9.

Light travels along a fibre optic by a) reflection b) refraction

c)

dispersion

The correct answer is a Read up on fibre optics 10.

Manufacturers of aircraft can ensure HIRF protection by a) designing specific avionic areas that are shielded against HIRF b) ensuring all single wires are shielded with metal conduit c) advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc. The correct answer is a Understanding HIRF By Gerald L. Fuller ----------------------------------------------------------

1.

How is data coupled to an ARINC data bus? a) By a capacitive pickup b) By an inductive pickup c) By a resistive pickup

The correct answer is b Read up on ARINC 429 and 629 data bus systems 2.

An AND gate output is 1 when inputs are a) both 0 b) 1 and 0 c) both 1


What is hex 110 in decimal a) 272 b) 282 c) 32

The correct answer is a Read up on hexadecimal numbering system 4.

Convert the binary word 1100 to decimal a) 16 b) 12 c) 11

The correct answer is b Read up on binary to decimal converion 5.

How does MIL-STD-1533 put data onto the data bus? a) Through the bus controller b) R1 (remote terminal) c) SSIFU (sub-system interface unit)

The correct answer is a Read up on MIL-STD-1533 data bus systems 6.

If a data message is made up of 1 and 0 it is a) analogue b) digital c) logic

The correct answer is b Digital is 1s and 0s

7.

Convert the binary word 1110 to decimal a) 12 b) 14 c) 15

The correct answer is b Read up on binary to decimal converion 8.

What sort of gate requires two positive voltages to operate a) NOT b) OR c) AND


What is the main disadvantage of a fibre optic data bus? a) Bend radius and moisture ingress at connections b) Less strong and durable when compared to twisted pair and coaxial

cable c)

Expensive to install

The correct answer is a Read up on fibre optics 10. When 4 binary serial counters are connected in cascade for frequency division, what division factor is required a) 4 b) 8 c) 16 The correct answer is c Each serial counter changes its state once every 2 clock pulses. So 4 serial counters devides by 2x2x2x2 = 16

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1.

Magnetic deflection in a CRT is achieved by a) a sawtooth waveform b) a trapezoidal waveform c) a sinusoidal voltage The correct answer is b Do not get confused with electrostatic deflection (plates), which would be sawtooth

2.

Fly By Wire systems in the fully active mode, the actuators will a) both be active b) one in active mode, one in damping mode c) both be in damping mode, awaiting control inputs

The correct answer is b Read up on Fly by Wire 3.

The parity bit in digital information is used a) for BITE programs b) to check the validity of data information c) to check the status of the system

The correct answer is b Read up on the purpose and use of parity bit

4.

On a Fly By Wire system, what controls the stab trim a) ELAC b) ELAC and SEC c) SEC

The correct answer is b ELAC = Elevator Aileron Computer, SEC = Spoilers Elevator Computer and FAC = Flight Augmentation Computers (rudder) 5.

A disadvantage of a fibre optic cable is a) shallow bend radius b) couplings susceptible to ingress of fluid c) liable to environmental contamination of end terminals


ARINC 429 SDI word format is at bits a) 1-8 b) 9 - 10 c) 32 The correct answer is b SDI = Source Destination Ident

7.

Convert the binary number 110010 to decimal a) 80 b) 50 c) 34

The correct answer is b Read up on decimal conversions 8.

What is serial to parallel and vice-versa called a) Encoder/Decoder b) Multiplex/Demultiplex c) Switching

The correct answer is b Read up on multiplexing 9.

What is the parity bit for on an ARINC 429 bus a) To check for corruption during transmission of a word b) To act as a terminal gap in an emergency c) To delay the signal

The correct answer is a Read up on purpose and use of parity bit 10.

3 binary counters in cascade. What is the division? a) 8 b) 16 c) 32 The correct answer is a Each serial counter changes its state once every 2 clock pulses. So 3 serial counters devides by 2x2x2 = 8

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1.

Control of software is by

a) b) c)

the National Aviation Authority engineers the aircraft manufacturers

The correct answer is a See AWN 45. 2.

A typical fibre optic connector is a) F-type connector b) coupling type, with lens fitted c) push-pull connector

The correct answer is b Read up on fibre optics. 3.

An ARINC 429 word label format is a) binary b) octal c) hexadecimal

The correct answer is b Read up on ARINC 429 word format. 4.

Which of the following is an optelectronic device? a) Triac b) Thyristor c) Laser Diode

The correct answer is c Read up on optoelectronic devices (from Module 4). 5.

What is the advantage of a single mode fibre optic over ordinary wire? a) Large bandwidth b) Small bend radius c) Not prone to damage

6.

How many LRUs can be connected to an ARINC 429 data bus a) 120 b) 20 c) 60

The correct answer is b Read up on ARINC 429 and 629. 7.

Convert the hexidecimal number D into decimal a) 13 b) 14 c) 14

The correct answer is a Read up on hexidecimal numbering system. 8.

Convert decimal 15 into binary a) 1101 b) 1111 c) 1110

The correct answer is b Read up on decimal to binary conversion. 9.

Convert 448 to hex a) 3616

b) c)

2416 2216

The correct answer is b read up on octal to hex conversion. 10.

When will a NAND gate give logic 0 at the output? a) When both inputs are at 0 b) When both inputs are at 1 c) When the inputs are different The correct answer is b Read up on logic gates.

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This is exam number 14. You've been here 1 times. 1. How many LRUs can be connected to an ARINC 629 data bus a) 120 b) 20 c) 60 The correct answer is a Read up on ARINC 429 and 629 data bus systems 2.

Convert decimal 15 into hexadecimal a) E b) G c) F

The correct answer is c Read up on hexadecimal numbering system 3. A 0 0 1 1

B 0 1 0 1

Which logic gate has this truth table C 0 1 1 0 a) NOT b) Exclusive OR c) NAND

The correct answer is b Read up on logic gates 4.

Which logic gate can be represented as a parallel circuit? a) OR b) Exclusive OR c) NAND

The correct answer is a Read up on logic gates 5.

What is the definition of level one software? a) Critical b) Essential c) Non-essential

The correct answer is a Read up on software classification

6.

ESDS bags are sealed by a) zip locks b) ESDS labels c) twine (100% cotton)

The correct answer is c Boeing manual says 100% cotton twine. Other manuals say ESDS label. However, it could be considered that ESDS labels do not 'seal'. 7.

What is 345 in binary? a) 101011001 b) 110011001 c) 100111001 The correct answer is a Read up on decimal to binary conversion

8.

What are the values of an ESDS wrist strap? a) 250 kilohms to 1.5 megohms b) 2 megohms to 5 megohms c) 2 gigohms to 4 gigohms

The correct answer is a CAAIPs Leaflet 9-4 5.3.1 - closest answer 9.

Convert 1D to binary a) 29 b) 11101 c) 101001

The correct answer is b Read up on hex to binary conversion 10.

ARINC 629 terminal transmit interval is a) unique to each terminal b) common to each terminal c) is when all transmissions are quiet The correct answer is b The TI is common to all LRUs on ARINC 629

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1.

Convert 2C hex to octal a) 54 b) 44 c) 35

The correct answer is a Read up on hex to octal conversions 2.

A fibre optic light source is normally a) a filament lamp b) a laser or LED c) a strobe light


What precautions are required when removing ESDS equipment a) Wear a wrist strap connected to an approved ground point b) Keep one hand on the airframe

c)

No special precautions are required

The correct answer is a Read up on anti-static precautions 4.

An ARINC 429 bus uses a) two bi-directional twin, sheathed and earthed wires b) a twisted shielded pair of wires c) a single twin cable for each transmitter


The minimum requirement for a cockpit voice recorder to begin operating is a) on engine startup b) on commencing the takeoff roll c) once established in the en-route climb

The correct answer is b See ANO Art 53 para.1. Although JAR Ops states that the CVR must begin when the aircraft is capable of moving under its own power. 6.

ARINC Communications Addressing and Reporting Systems is used to a) download aircraft status reports b) connect the aircraft to base c) make telephone calls

The correct answer is b Read up on ACARS 7.

ARINC 429 data bus systems uses a) decimal numbering b) hexadecimal numbering c) binary coded decimal

The correct answer is c Read up on ARINC 429 and 629 data bus systems (429 uses either BCD or binary) 8.

With radio coupled autopilot, what are the inputs a) ADF and ILS b) ADF and VOR c) ILS and VOR

The correct answer is c Read up on autopilot 9.

B-RNAV system must be capable of a) holding six waypoints b) displaying distance and bearing to waypoint c) reversing the waypoints for "fly-me-home"

The correct answer is b Read up on B-RNAV 10.

The basic principle of radar is based upon a) the amount of power in the signal returned b) the time delay between outward and returning pulse c) ultrasonic wave propagation The correct answer is b Read up on basic radar theory

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1.

An ARINC 429 Binary Coded Decimal word occupies word bits a) 11 - 28 b) 11 - 29 c) 1-8

The correct answer is b Two versions of ARINC 429. BCD uses 11 - 29, Binary uses 11 - 28. 2.

Engine parameters are displayed on a) ECAM b) EHSI c) CDU

The correct answer is a Read up on ECAM/EICAS systems 3.

A flight deck CRT LRU is being replaced. What does the ESDS label indicate? a) Wrist straps should be worn b) Do not touch plug pins or leave them exposed c) Remove power before connecting

The correct answer is b See Pallett's Micro Electronics In Aircraft Systsems or CAAIPs 9-4 para.7.1.3. 4.

What systems does the ADC feed? a) Altimeter / FMS / secondary radar b) Standby altimeter/machmeter c) Cabin pressure controller sensor / machmeter / Altimeter

The correct answer is c Read up on Air DAta Computers 5.

A hexadecimal is a number to base a) 8 b) 2 c) 16

The correct answer is c Read up on hexadecimal numering system 6.

An ARINC 429 system uses a a) 16 bit word over a twisted pair of wires b) 32 bit word over a twisted pair of wires c) 20 bit word over a bi-directional bus


A thyristor is a device which has a) a positive temperature coefficient b) a negative temperature coefficient c) a temperature coefficient of zero

The correct answer is b Read up on thyristos 8. When using a wrist strap, before touching the LRU the resistance should be measured from your skin to the end of the earth probe. This should be a) more than 10 kilohms b) less than 10 kilohms

c)

less than 1 ohm

The correct answer is a Read up on anti-static precautions 9.

1012 converted to decimal is a) 52 b) 510 c) 210

The correct answer is b Read up on binary to decimal converions 10. shaft are

Physical variables in quantitative forms, such as voltage or angular rotation of a

a) analogue b) digital c) binary The correct answer is a Read up on analogue/digital definitions

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1.

Within a 3 bit frequency cascade, division is to a) 8 b) 4 c) 2

The correct answer is a Read up on counters 2.

When is a radio altimeter active? a) Up to 10,000 ft b) Up to 2,500 ft c) Up to 100 ft

The correct answer is b Read up on radio altimeters and ILS 3.

Which of the following could be a primary cause of HIRF protection failure? a) Unserviceable radio filters b) Broken or missing static wicks c) Corrosion on bonding leads

The correct answer is a The exact definition of HIRF does not include electrostatc discharge (ESD). But only interference from outside sources. Understanding HIRF By Gerald L. Fuller 4.

The binary coded decimal number 10011000 expressed as a decimal number is a) 98 b10 b) 152 10 c) 152 2

The correct answer is a Read up on BCD to decimal conversions (BCD is not the same a s binary) 5.

The decimal number 7 expressed as a binary number is a) 111 2 b) 7 2 c) 101 2

The correct answer is a Read up on decimal to binary conversions 6.

Convert 011101 binary to octal a) 25 b) 33 c) 35

The correct answer is c Read up on binary to octal conversions 7.

Manufacturers of aircraft can ensure HIRF protection a) by designing specific avionic areas that are shielded against HIRF b) by ensuring all single wires are shielded with metal conduit c) by advising the operator of parts of the aircraft susceptible to degradation due to corrosion, moisture ingress, flexing etc. The correct answer is a Understanding HIRF By Gerald L. Fuller 8.

An ARINC 629 characteristic is a) all LRUs can transmit at the same time b) all LRUs can transmit and receive at the same time c) data can transmit in both directions down the data bus

The correct answer is c Read up on ARINC 429 and 629 data bus systems 9.

In an ARINC 429 word string, bits 1 - 8 represent a) the source of the message b) the monitored parameter c) the destination LRU


What limits the number of ARINC 429 receivers on a bus a) The speed and size b) The parallel input impedance c) The weight

The correct answer is b Read up on ARINC 429 and 629 data bus systems

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1.

The 'fan-in' in a gate is the a) number of outputs from a gate b) number of inputs to a gate c) number of inputs and outputs of a gate

The correct answer is b Read up on logic gate systems 2.

Very Large Scale Integrated (VLSI) means the number of gates in a single IC is a) up to 1000 b) up to 10,000 c) over 10,000

The correct answer is c Read up on logic gate systems

3.

The advantage of DRAM over SRAM is a) they operate slower b) has a larger storage capacity per chip area c) are cheaper to manufacture

The correct answer is c Read up on memory (RAM) types 4.

A BYTE is usually a) a 12 bit word b) an 8 bit word c) a six bit word

The correct answer is b Read up on computer terminology 5.

Data is transferred on the MIL-STD-1553B by a) bi-polar return to zero b) manchester bi-phase c) non return to zero

The correct answer is b Read up on MIL-STD-1553 data bus system 6.

The fibre optic cable can be identified on aircraft by its jacket colour which is a) purple b) red c) yellow

The correct answer is a Read up on fibre optics 7. the

For a fibre optic cable connector that is not regularly disconnected you would use a) b) c)

ceramic lens type ball lens type butt type


The timebase in a CRT consists of a) an amplifier and an oscillator b) an oscillator only c) an amplifier only

The correct answer is a Read up on CRTs 9.

HIRF protection of LRUs is provided by a) built in filters and overvoltage circuits b) internally shielded cables c) built in filters only

The correct answer is a Understanding HIRF By Gerald L. Fuller 10.

An EADI display of flight director commands are coloured a) cyan b) red c) magenta

The correct answer is c Aircraft instruments and integrated systems,(pallet) page 302 fig 12.5 eadi flight director command bars are magenta

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1.

Which systems does a modern ADC give information to? a) Flight control computer, Air Data Instrument, Engine systems b) EFIS c) EICAS

The correct answer is a Read up on Air Data Computer 2.

Binary Number: 110010 a) 80 b) 50 c) 34

The correct answer is b Read up on binary to decimal conversion 3.

How are engine indications sent to the FDR? a) Via ARINC 573 b) Via ARINC 629 c) Source isolated

The correct answer is a Read up on Flight Data Recorder 4.

What is this truth table? A B A.B 000 100 010 111 a) AND gate b) NOR gate c) NOT gate

The correct answer is a Read up on logic gates 5.

Where do the outputs from a DADC go? a) EADI b) EHSI c) IRMP: Inertial Reference Mode Panel The correct answer is c Read up on Digital AIr Data Computer (IRMP is the control for the Inertial Referencing Unit)

6.

During an EFIS screen fit a) use bonding strap b) don’t touch terminals c) no tooling is required

The correct answer is b Microelectronics in Aircraft Systems - Pallet. pg 219 7.

To stop earth loops forming, you would

a) b) c)

leave both ends of the cable screen open circuit earth both ends of the cable screen earth only one end of the cable screen

The correct answer is c Read up on anti-static precautions 8.

How many satellite signals are required to achieve precise 3D positioning? a) 4 b) 5 c) 6

The correct answer is a Read up on satallite navigation (or GPS) 9.

Binary addition of 1101 + 101101 is a) 58 b) 61 c) 70

The correct answer is a Read up on binary addition and binary to decimal conversions 10.

What system uses base 8? a) ARINC 429, in dataword labels only b) ARINC 629 c) ARINC 573

The correct answer is a Read up on ARINC 429 data bus word format

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1.

What maintenance problems are associated fibre optics? a) Corrosion b) Earthing faults c) Kinking and contamination of connectors


Who can sign for a software update? a) Design organization or the aircraft manufacturer b) Engineer c) Chief pilot

The correct answer is b AWN 43 3.

What sort of gate is this?

a) b) c)

Or gate NOR gate NOT gate


What creates the raster effect on a CRT? a) Sawtooth frequency b) Sinusoidal frequency c) Trapezoidal

The correct answer is a Read up on Cathode Ray Tubes 5.

Common fibre optic use is a) modulating intensity on direct read b) modulating frequency on direct read c) HIRF


An aircraft may have been HIRF affected. a) A static wick check is required b) A bonding load check is required c) Test all radio frequencies for interference

The correct answer is a Read up on HIRF protection 7.

The binary number 11010111 is expressed as a decimal is: a) 215 b) 107 c) 53

The correct answer is a Read up on binary to decimal converion 8.

The octal number 1001 expressed as a decimal is: a) 513 b) 613 c) 713

The correct answer is a Read up on octal to decimal conversion 9. With a relative humidity of 10% to 20%, if you walked over a carpet what electrostatic voltage value would you expect to see? a) 6,000 volts b) 12,000 volts c) 35,000 volts The correct answer is c Read up on static electricity 10.

Before fitting a Printed Circuit Board you should check the a) resistance between skin and strap end plug is less than 10 megohms b) resistance between skin and strap end plug is more than 1 megohms c) resistance between strap and strap end plug is less than 1 megohms The correct answer is c CAAIP Leaflet 9-4 5.3.1

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1.

A fibre optic data bus

a) b) c)

can only transmit 1 message at a time can transmit several messages simultaneously is only used for non essential messages


The minimum requirement for an aeroplane CVR is a) from power on b) from engine start c) from beginning of take off roll

The correct answer is b JAR OPS Para 1.700 (c) OR answer c by CAP 393 Section I Para 53 3. data bus is

On an ARINC 629 data bus, the maximum amount of current-mode couplers per a) b) c)

46 120 64

The correct answer is b 120 LRUs maximum (but the B777 uses 46) 4.

To connect a LRU to the data bus a) a current mode coupler, serial interface module and terminal controller is

required b)

current mode coupler, terminal controller and a production break is

c)

a terminal controller and interface module only is required

required

The correct answer is a Read up on ARINC 429 and 629 data bus systems 5. Core is to

A current-mode coupler contains an E-Core assembly. The purpose of the Ea) b)

couple the signal to the data bus provide effective screening of the signal through the current-mode

c)

enable easy access for monitoring of the signal

coupler

The correct answer is a Read up on ARINC 429 and 629 data bus systems 6.

The ARINC 429 low rate of transmission is a) 12-14 Kbits/second with high of 100 kBits/second b) 12-14 Mbits/second with high of 100 Mbits/secon c) 100 kbits/second with high of 12-14 Mbits/second

The correct answer is a Read up on ARINC 429 and 629 data bus systems 7. A D to A converter is required to produce an output range of 0 to –10V. This can be achieved by a) a non inverting op amp connected in series with output b) an inverting op amp connected in series with output c) a differentiator with a 100 Kilohm feedback resistor The correct answer is b Read up on DACs and ADCs 8.

A D to A converter would use a precision amplifier to a) ensure that the output voltages remain accurate

b) ensure that the input voltage remains accurate c) compensate for the variation of the feedback resistor with temperature The correct answer is a Read up on DACs and ADCs

9. A given transducer provides a voltage which corresponds to true heading. This voltage can be converted to 'bits' by using a a) commutator b) digital to analogue converter c) analogue to digital converter The correct answer is c Read up on DACs and ADCs 10.

The output of a NOT gate is logic 1. The input is a) logic 1 b) logic 0 c) both logic 1

The correct answer is b Read up on logic gates

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1.

An ARINC 629 bus cable is a twisted pair of wires with a) a 130 ohm resistor at one end b) a 230 ohm resistor at one end c) a 130 ohm resistor at both ends

The correct answer is c Read up on ARINC 429 and 629 data bus systems 2.

An ARINC 629 stub cable a) connects bi-directional data between the LRU and current mode coupler b) connects single directional data between the LRU and current mode

coupler c)

connects bi-directional data between two LRUs

The correct answer is a Read up on ARINC 429 and 629 data bus systems 3. Care must be taken when installing ARINC 629 cables into bus panels, damage to cables can cause a) arcing of high voltage signals b) standing waves. c) corrosion of the conductor The correct answer is c Read up on ARINC 429 and 629 data bus systems 4.

An aircraft data bus system a) cannot use both ARINC 629 and ARINC 429 data buses. b) can use both ARINC 629 and ARINC 429 as they are compatible. c) can use both systems, ARINC 629 and ARINC 429 via system card files and signal gateways The correct answer is c Read up on ARINC 429 and 629 data bus systems 5.

An Inertial Navigation System (INS/IRS) computes distance from acceleration by

a) b) c)

a simple integration a differentiation followed by an integration two successive integrations

The correct answer is c Read up on acceleration - velocity - distance computations 6.

Before the aircraft is moved from the loading pier the pilot must a) insert the latitude and longitude of the pier into the IRS b) set the altitude to be fed into the INS c) insert the longitude and latitude of the first waypoint into the INS

The correct answer is a Read up on Inertial Reference Systems 7.

A 12 bit 16 Channel encoder will use a multiplexer with a) 2 wire series address line b) 3 bit parallel address line c) 4 bit parallel address line

The correct answer is a Read up on multiplexing 8.

An A to D converter uses successive approximation to a) increase resolution b) increase speed c) increase accuracy

The correct answer is b Read up on ADCs and DACs 9.

An R-2R D to A converter uses a) two values of resistors whose precision is not important b) two values of precision resistors c) resistors whose values are logarithmic

The correct answer is b Read up on ADCs and DACs 10.

A fiber optic cable to LRU connector should be connected a) using torque-loaded pliers b) hand tight only c) very carefully to ensure alignment and reduce light loss The correct answer is c Read up on fibre optics

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1.

An IRS has a) accelerometers fixed to the airframe and gyros on a stable platform b) accelerometers and gyros fixed to a the airframe c) accelerometers on a stable platform and gyros fixed to the airframe

The correct answer is b Read up on IRS 2.

An IRS system requires data for wind computation from a) central Air Data Computer b) satellites c) Doppler System

The correct answer is a Read up on IRS 3.

The FMS carries out a Rho/Theta navigation function, the purpose of this is to a) update the IRS system with an accurate position fix of latitude and

longitude b) c)

to update the EMS with the new lateral flight profile for the flight plan to update the VOR and DME systems with an accurate position fix

The correct answer is a Read up on FMS - IRS update function 4.

The FMS is updated a) by the aircrew by reference to the Tech Log b) automatically by update data from the ACARS c) by an aircraft engineer updates the system either by a magnetic tape or

floppy disc The correct answer is c Read up on FMS database updating 5.

Pitch Control of a fly by wire system is achieved by a) elevators only b) stabilizer and elevator c) stabilizer only

The correct answer is b Read up on fly-by-wire 6. controller:

In a fly by wire system, if the pilot control input is derived from a side stick a) b) c)

control surface feedback is fed to the side stick there is no control surface feedback to the side stick there will be only control surface feedback to the side stick after a

computer failure The correct answer is b Read up on fly-by-wire 7.

In memory using multivibrators, when power is switched off the datawill a) still be available on power up b) be lost c) automatically be downloaded

The correct answer is b Read up on RAM types 8.

The resistance of the wrist strap used as part of anti static precautions should be a) 0 - 200 ohm b) 250 kilohm - 1.5 megohm c) 20 megohm - 200 megohm

The correct answer is b CAAIPs Leaflet 9-4 5.3.1 9.

What is the function of a status register in a microprocessor? a) To indicate the status of the processor b) In the ALU, to store the position of the program during an interrupt c) To synchronize the clock pulse

The correct answer is a
What is the advantage of EPROM over fusible link?

a) Cheaper to produce b) Can be re-programmed c) Does not need refreshing The correct answer is b Read up on RAM types

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1.

A basic IRS platform has a) 3 accelerometers and 2 laser gyros b) 2 Accelerometers and 3 laser gyros c) 3 accelerometers and 3 laser gyros The correct answer is c Jeppesen Avionics Fundamentals Page 137

2.

What must be entered into the IRS before the aircraft can be moved? a) Present position b) Flight plan c) Cruise height

The correct answer is a Read up on IRS 3.

The FMS Operational Data Base is a) updated once a month b) is fed with information on aircraft weight, cruise altitude and cost index

before take off c)

needs no update information

The correct answer is b Read up on FMS databases 4.

Control surface feedback is fed back to a) the Flight Control Computer only b) the Flight Control Computer and side stick controller c) the side stick controller only

The correct answer is a Read up on fly by wire 5.

The function of a commutator is to a) convert from analogue to binary form b) provide a sampling in sequence of a number of parameters c) provide continuous availability of all parameters connected to the system

The correct answer is b Read up on DACs and CADs 6. When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is a) either positive or negative b) positive c) negative The correct answer is c Read up on logic systems 7. The output of an AND gate having two inputs A and B is logic 1. The two inputs will have the logic states of a) A = 0, B = 0

b) c)

A = 1, B = 1 A = 1, B = 0


Registers are used in digital computers to a) store bits of information in a permanent memory b) store a limited amount of information on a temporary basis c) keep a count of operations completed

The correct answer is b Read up on CPU architecture 9.

What is 0111000012 in Octal? a) 281 10 b) 225 8 c) 341 8

The correct answer is c Read up on binary to octal conversions

10.

ARINC 629 is used for a) normal flight b) emergency only c) a backup to ARINC 429

The correct answer is a Read up on the ARINC 429 and 629 data bus system

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1.

Testing of HIRF on aircraft systems is done a) by periodically listening for interference on all systems b) at and during production and testing (initial certification) c) only after a report of radio interference

The correct answer is b Understanding HIRF By Gerald L. Fuller 2.

How are earth loops prevented from forming? a) Ground only one end of the cable screen b) Ground both ends of the cable screen c) Ground neither end of the cable screen

The correct answer is a Read up on HIRF protection 3.

When carrying out a bonding check on a surface protected by anodic film a) the anodic film should be removed locally to ensure a good contact b) the film is conductive so no preparations are required c) add a bonding factor to the result of the test to account for the resistance of the anodic film The correct answer is a Read up on electrical testing 4.

The accelerometer output in an INS/IRS is a) integrated twice to give velocity

b) c)

integrated twice to give distance integrated once to give distance

The correct answer is b Read up on acceleration - velocity - distance computations 5.

An INS/IRS Battery Unit provides a) standby power when airborne and on the ground b) standby power only whilst in flight c) standby power only on the ground

The correct answer is a Aircraft Instruments and Integrated Systems. Pallett Page 247 & 248 6.

The FMS Navigation Data Base must be updated a) once a month b) every 28 days c) before each flight to establish the flight plan

The correct answer is b Read up on FMS databases 7.

If a fly by wire actuator loses hydraulic power the control surface will a) automatically move back to the neutral position b) remain rigid in the failure position c) remain in the failure position but may move due to aerodynamic pressure

The correct answer is c Read up on fly by wire systems 8. The output of an OR gate having two inputs A and B is logic 0. The two inputs will have the logic states of a) A = 0, B = 0 b) A = 1, B = 0 c) A = 0, B = 1 The correct answer is a Read up logic gates 9.

When clamping cable looms containing co-axial cables a) avoid distortion to the co-axial cable to maintain the dielectric constant b) distortion of the outer sheath is allowed providing the inner cable is not

affected c)

the clamps must be no more than 1 metre apart

The correct answer is a Read up on cable installations 10.

When incorporating an aerial cable it must be a) in the centre of the other wires b) outside the other wires for easy access c) positioned separately from the loom

The correct answer is c Read up on cable installations ----------------------------------------------------------

1.

Some of the advantages of fiber optic cable over copper cable are a) non conductive, easy to manufacture and assemble, higher bandwidth b) smaller size and weight, non conductive, more rugged, higher security

c)

non conductive, higher bandwidth, higher security, smaller size and

weight The correct answer is c Read up on fibre optics 2. When carrying out airframe bonding checks as part of a program of HIRF prevention the airframe bonding resistance should be less than a) 50 milliohms b) 100 milliohms c) 1 ohm The correct answer is a Read up on HIRF protection 3.

LCD screens are driven by a) AC voltage b) variable current DC voltage c) fixed current DC voltage

The correct answer is a See discussion in Forum Module 5 for details 4.

IRS alignment a) takes up to 10 minutes and the present position can be entered at any time during alignment b) takes up to 10 minutes and present position must be entered before alignment. c) takes up to 10 minutes and the previous flight shut down present position is used for the alignment The correct answer is a Read up on IRS 5. A fault light appears on the IRS Mode Selector Unit during the alignment sequence. The correct action is a) immediately switch off and select the standby system. b) select HDG/STS on the Inertial System Display Unit (ISDU), observe the action code in the right alpha/numeric display c) refer to the warning display on the EICAS/ECAM system. The correct answer is b Read up on IRS 6.

EFlS systems have two control panels, their purpose is a) to provide display control by one control panel whilst the other provides a

standby b) one for the EADI display and one for the EHSI display c) one to control the type of EFlS display and the other to select the source of the information being displayed The correct answer is c Read up on EFIS 7.

A FMS has a total of how many Data Bases a) 1 b) 2 c) 4

The correct answer is b Read up on FMS databases (navigation and performance databases) 8.

Fly by wire High Speed protection is

a) b) c)

to prevent high speed stall to increase the pitch angle as speed increases to prevent tuck under

The correct answer is c Read up on fly by wire 9.

In a single mode fibre optic cable a) several waves travel down the cable b) the diameter of the cable is dependent on the wavelength of the light

used* c)

the distortion of the signal occurs is dependent on the length of cable

The correct answer is b Read up on fibre optics 10. A semiconductor which emits photons and releases electrons when stimulated by photons is called a) an LED b) a photodiode c) a laser diode The correct answer is c Read up on laser diodes (Light Amplification by Stimulated Emission of Radiation) ----------------------------------------------------------

1.

An IRS Laser gyro provides a) detection of the rate of movement about an aircraft axis b) detection of the earth’s rotation to establish true north c) detection of the earth’s gravitational force to establish true north

The correct answer is a Jeppesen Avionics Fundamentals Page 137 2.

A Liquid Crystal Display (LCD) has the advantage over a CRT because a) it displays more colours b) it requires less servicing c) it requires no cooling

The correct answer is c Read up on LCDs and CRTs 3.

The left and right cockpit displays a) are supplied from separate Symbol Generators at all times b) are supplied from the same Symbol Generator c) will only be supplied from the same symbol generator when all other symbol generators have failed The correct answer is c Read up on EFIS 4.

A single failure of a fly by wire control surface computer will a) cause the system to revert to an alternate law of operation b) cause the system to revert to a direct law of operation c) not have any operational effect on the system

The correct answer is c Read up on fly by wire systems

5.

An encoder changes a) analogue to digital b) digital to analogue c) data from one format to another

The correct answer is c Read up on encoders and decoders 6.

An encoder using Grey code a) changes analogue to digital b) changes analogue to binary c) changes digital to analogue

The correct answer is a Read up on altitude encoders and grey code 7.

What is the Low Speed transmission rate for ARINC 429? a) 12 – 14.5 kbits / second b) 100 kbits / second c) 120 kbits / second

The correct answer is a Read up on ARINC 429 and 629 data bus systems 8.

What is this symbol:

a) b) c)

Exclusive AND gate Exclusive OR gate Exclusive NOR gate


What Logic Gate does this switch circuit indicate?

a) b) c)

AND gate OR gate NOR gate


What is the effect of a level 1 software failure? a) Significant reduction in safety margins b) Large reduction in safety margins c) Loss of aircraft and / or fatalities

The correct answer is c Read up on software management

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1. protected by

Ribbon cables affected by mutual impedance and current loop leakage are a) b) c)

earthing each conductor earthing each alternate conductor wrapping the complete ribbon in an earthed shield

The correct answer is b Read up on HIRF protection 2.

What is the definition of baud rate? a) 1 bit per second b) 1 byte per second c) 1 word per second

The correct answer is a Read up on computer terminology 3.

An RS flip-flop with Q at 1 is said to be a) reset b) set c) zero

The correct answer is b Read up on flip-flops / vibrators 4.

What is the Boolean Algebra for the XOR Circuit below?

The correct answer is b Read up on boolean algebra 5.

What does the logic circuit below represent?

a) b) c)

Half adder circuit Full Adder Circuit Multi-bit adder

The correct answer is b Read up on adders 6.

The release of a photon by another photon is an example of a) a zener diode b) an LED c) a photo diode

The correct answer is b Reead up on LED operation 7. be?

When a JK flip flop is used as a memory device, what type of memory would it a) b) c)

non-volatile read-only volatile

The correct answer is c Read up on memory types 8. Once an ARINC 629 LRU has transmitted a message it will wait how long before transmitting again? a) Until the end of the synchronization gap. b) Until the end of the transmit interval c) Until the start of the terminal gap The correct answer is b Read up on ARINC 629 data word format 9.

How is the word label 206 written in ARINC 429? a) Decimal 206 b) Binary 11000110 c) Octal 01100001

The correct answer is c Label is Octal - MSB to right - so yes, it is backwards 10.

What is ARINC 561 used for? a) Flight Data Recorder systems

b) c)

Fly by Wire systems Inertial Navigation Systems

The correct answer is c Read up on the ARINC data bus systems ----------------------------------------------------------

1.

What are the outputs from digital clocks used for? a) b)

VOR, ILS and DME Flight data acquisition unit, Flight management computer and Voice

c)

Weather radar, TCAS and ACARS

recorder

The correct answer is b Only these require real time reference 2.

What does a fibre optic star connection do?

a) Provides direct point-to-point services to units on dedicated lines emanating from the central hub b) Provides a continuous loop of fibre interconnecting all nodes c) Shares a common bandwidth of a common cable The correct answer is a Read up on fibre optics 3.

What is the purpose of the ALU? a) To convert serial into parallel data b) To store data being used by the CPU c) The part of the CPU unit where arithmetic & logic operations are carried

out The correct answer is c Aircraft Electricity and Electronics, Eismin, 5th Edition Page 146 4.

Which logic gate has both inputs ‘high’ to get an output? a) NAND gate b) XOR gate c) AND gate


Which would have the least components? a) ALU b) CPU c) LSI

The correct answer is a Read up on CPU components 6.

How many address lines would be needed for an 8 line MUX? a) 4 b) 3 c) 2

The correct answer is b Read up on multiplexing / demultiplexing 7.

In a MUX, how is parallel converted to serial?

a) b) c)

By way of a shift register By way of a demultiplexer By way of an encoder

The correct answer is a Read up on shift registers 8. move?

If a magnetic field is parallel to the X plates in a CRT, which way will the beam a) b) c)

Diagonally Vertically Horizontally

The correct answer is c Read up on CRTs 9.

What would you expect to see displayed on an EADI display? a) Flight director command bars, slip indicator, rate to altitude & autoland b) Compass heading, selected heading and VOR c) Course information, weather radar, way point alert and bearing pointers

The correct answer is a Read up on EFIS 10.

The binary number 10101000111001012 in hexadecimal is: a) 22BC 16 b) A8E5 16 c) FFFF 16

The correct answer is b Read up on binary to hex conversions

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1. A fibreoptic lens type coupling with lens and integral LED compared to an endfire coupling is a) more efficient b) less efficient c) equally efficient The correct answer is a 2.

An analogue to digital converter is as accurate as a) the sampling rate b) the frequency c) the amplitude

The correct answer is a 3. A digital to analogue converter that requires the output to range between 0v and 10v would have a) a non-inverting amplifier in parallel with the output line b) an inverting amplifier in series with the output line c) a non-inverting amplifier in line with the output with a resistor to ground The correct answer is b 4.

An LED display is

a) b) c)

red and green monochrome only high definition

The correct answer is b 5.

An EFIS ADI display will show along with pitch and roll a) flight director bars, autoland, compass rose, altitude b) flight director bars, autoland, altitude, range to altitude, decision height c) decision height, autoland, rad alt , altitude

The correct answer is c 6. A full operation system BITE check will carry out a internal system test that ensures the system meets design requirements and is operational a) but will not move the controls b) as well as checking full system and will move the controls to their stops c) as well as checking full system but will not move the controls to their stops The correct answer is c Digital Avionic Systems - Cary Spitzer. Page 109, Arinc report 604 guidance for design and use of built in test equipment states... 'BITE should excercise the hardware sufficiently to determine if it meets the performance requirements but should not drive it against mechanical stops.' 7. If on a flight deck EFIS system all the displays were missing one bit of information this is most likely to be a) the symbol generator and display b) the input sensor bus and display controller c) the display controller and symbol generator The correct answer is b 8. A arinc data word is bits 11-29, if bits 11-18 are patched which of the following would be the LSB bit a) 19 b) 29 c) 21 The correct answer is a 9.

What is a band? a) A block of data b) A bit of data c) A byte of data


Passive sensors in fibre optics a) require power for the processing signal before they send them down the

fibre optic b) c) The correct answer is c

require no power and they do not process signals process the signal but do not require power

----------------------------------------------------------

1.

An LCD display uses what type of power supply? a) Continuous AC b) Variable level DC voltage c) DC voltage

The correct answer is a See discussion in Forum Module 5 for details 2.

Fibre optic data bus links are a) bi-directional b) one way data buses c) simplex

The correct answer is a 3. 0011011000101001 when transferred to computer language this information can be a representation of a) binary, octal or decimal numbers b) hex, octal and binary numbers c) hex, octal and decimal numbers The correct answer is b 4.

In a bi-stable memory circuit a) the memory is lost as soon as power is removed b) the memory is retained indefinably c) the memory needs to be refreshed constantly, even when power is on

The correct answer is a 5.

In an analogue to digital converter, the input voltage a) stays on constantly b) is switched by the digital input c) is intermittent


In an RS flip flop output is one. This means it is a) set b) reset c) intermediate

The correct answer is a Aircraft Electricity and Electronics Eismin 5th Edition Page 143 7.

ARINC 629 utilizes a) full duplex b) half duplex c) simplex


Optical fibre losses are due to a) absorption only b) absorption, scattering and reflection

c)

radiation, absorption and reflection

The correct answer is b Introduction to Fiber Optics John Crisp Page 50 9.

The cone of acceptance is measured between a) longitudinal axis of the core and the outer angle b) the two outer angles c) the diameter of the core

The correct answer is a Introduction to Fiber Optics John Crisp Page 29 10.

An R-2R Converter has values or resistance a) whose precision are accurate b) whose relative precision are accurate c) whose precision are not accurate

The correct answer is b ----------------------------------------------------------

1.

An ALU is an example of a) LSI b) SSI c) MSI


What does 1 represent in an analogue system? a) Switches closed, magnetised b) Switches open, unmagnetised c) High frequency


A centralised monitoring computer system is used a) to test system during flight and for BITE test of systems on the ground using a carry on control unit b) to test systems in flight and on the ground using a centralised on board control unit c) testing systems on the ground only The correct answer is b Aircraft Electricity and Electronics Eismin 5th Edition Page 270 4.

A signal in an ARINC 629 system uses a) a pair of wires per transmitter unit b) a twisted pair of wires or fibre optics c) a single wire

The correct answer is b Aircraft Electricity and Electronics Eismin 5th Edition Page 148 5.

A beam deflection on EFIS displays are a) electromagnetism b) electrostatic c) solid state

The correct answer is a Aircraft Instruments and Integrated Systems EHJ Pallett Page 297 6.

A nand and nor to become a not gate have a) inputs connected together b) inputs inverted c) outputs inverted


An in-series ARINC 429 system transmits using a) wave dividing multiplexing b) time dividing multiplexing c) encoder


Fibre optic cables use a) reflective outer shell b) refractive outer shell c) reflective inner shell

The correct answer is b The outer cladding is glass, so it is refractive (but less so than the core). Cladding causes Total Internal Reflection (TIR), so question can be interpreted in two ways. 9.

A sinusoidal circular time constant produces what output? a) 90 degrees out of phase b) 180 degrees out of phase c) In phase


A terminal controller a) transmits only when addressed b) is repetitive transmitting c) will transmit only once during each transmit interval

The correct answer is c

1.

What is the advantage of series over parallel message sending? a) Quicker b) More information sent c) Only one pair of conductors

The correct answer is c Aircraft Electricity and Electronics Eismin 5th Edition Page 146 2.

The number of LRUs which transmit/receive on ARINC-429 is dependent upon a) size of S.D.I b) speed of transmission & size of aircraft systems c) parallel input impedance

The correct answer is c 3.

In fibre optic cable, signals are separated by

a) b) c)

active optic filter passive optic filter low pass filter

The correct answer is a 4. In an EFIS display, the lines, Scales, Indicator and Synoptic are generated by a) synoptic scan b) stroke scan c) raster scan The correct answer is b 757 MM 34-22-00 page 40 (p) and 737 MM 34-22-00 page 47, 4(b) 5.

Speed of computer process information depends upon a) the size of the programme b) the time period to access the memory c) the external inputs to the system

The correct answer is b 6. A typical example of a mass storage memory device which "write once" and "read many" is a) a CD Rom b) an IC c) a magnetic tape The correct answer is a 7.

When handling PCB's labelled ESDS, what precaution are taken? a) Isolate electrical power before installing on Aircraft b) First earth with aircraft then to it c) Do not touch its pins as copper contamination can occur

The correct answer is a Microelectronics in Aircraft Systems. Pallett. Page 219 8.

A computer consist of at least the C.P.U and a) memory and input & output port b) register section, ALU, timing and control section c) memory, ALU, input & output port


Electromagnetic compatibility is achieved by a) shielding, screening, earthing, bonding and interference filters b) enclosing the system with same frequency and strength of which screening is done c) coating in a conductive paint The correct answer is a 10.

The supply to an LCD is a) AC b) current restricted DC c) voltage restricted DC

The correct answer is a See discussion in FORUM Module 5

----------------------------------------------------------

1. EADI is by

The method of producing (white) lines for aircraft symbols, V/S scale etc. on an a) b) c)

stroke scan raster scan trapezoidal input

The correct answer is a MM 737-300/400/500, 34-22-00 page 47 4b or MM 757 34-22-00 page 40 (p). 'The special symbols, characters, letters, vectors and arcs are displayed using the stroke method. The EADI sky/ground ball or EHSI weather radar are displayed using the raster method 2.

In modern aircraft, the output from the clock is used a) to synchronise the signals on the control bus b) give GMT details to the flight recorder and other systems c) to provide a clock pulse for CRT


Audio sounds recorded digitally a) are not as accurate due to clipping and input errors b) are superior quality and "data preservation" c) are narrow bandwidth


When carrying out HIRF maintenance on aircraft, the max resistance is a) 1 milliohm b) 1 ohm c) 0.05 ohms


A computer message 3B4 is a) binary b) octal c) hexadecimal


One of the ARINC 429 formats is a) hexadecimal b) BCD c) octal

The correct answer is b http://www.condoreng.com ARINC 429 tutorial 7.

When does voice data recording commence? a) On engine start b) From aircraft take off run c) After take off when airborne

The correct answer is b CAP 393 Section I Para 53, OR answer c by JAR OPS Para 1.700 (c)

8.

What is 54 octal in hexadecimal a) 2C b) 4F c) 2F


A heading reference of 320 degrees in a word label format would be written as a) 101010001 b) 11010000 c) 01000111

The correct answer is b 10. Within an EFIS display system, all displays have 1 bit of information missing. What would be the most probable cause? a) Symbol generator and sensor input b) Display controller and sensor input bus c) Display controller and symbol generator The correct answer is b ----------------------------------------------------------

1.

A computer using RAM would utilise a) a compact disc b) an integrated circuit (chip) c) magnetic tape


With a j-k flip flop which is the output set a) q=1 b) q=0 c) either


If the glideslope pointer is below the centre mark the aircraft is a) on the glideslope b) below the glideslope c) above the glideslope


2D in decimal is a) 45 b) 43 c) 41


The operational data base of the FMS may have to be modified in flight a) by the pilot

b) c)

automatically by the DADC It cannot be modified in flight


An LED will emit light when a) it is forward biased b) it is reverse biased c) either forward or reverse biased if a sufficient level of ac voltage is

applied The correct answer is a Aircraft Electricity and Electronics Eismin 5th Edition Page 121 7.

On an EFIS system the weather radar is displayed on a) the EADI b) the EHSI c) the FMC CDU

The correct answer is b Aircraft Instruments and Integrated Systems EHJ Pallett Page 305 8.

CADC outputs are a) altitude, vertical speed, IAS, mach no b) altitude ,vertical speed, angle of attack, TAT, SAT c) altitude, vertical speed, TAS, CAS, mach no, SAT, TAT

The correct answer is c Aircraft Instruments and Integrated Systems Pallett Page 162. 9.

Data is converted from serial to parallel and parallel to serial by a) a parallel register b) a shift register c) a synchronous counter


A group of bits transmitted at the same time is a) a clock signal b) parallel data c) serial data

The correct answer is b ----------------------------------------------------------

1.

A typical characteristic of a CMOS is a) low power dissipation b) high voltage handling c) high power dissipation


If one EICAS CRT fails a) the remaining CRT will display primary EICAS data b) the FMS CDU will display the failed CRT data c) the standby CRT will automatically take over


84 decimal in hexadecimal is a) 54 b) f4 c) 5f


EADI displays a) pitch and roll attitudes b) heading and weather radar c) pitch, roll and waypoints


On an EHSI in weather radar mode, a severe storm would be shown as a) orange areas with black or yellow surrounds b) red areas with black surrounds c) blue areas with white background


Variations in light on EFIS displays are compensated for by a) integrated light dependant resistors in the display compensating for each display individual b) An external light dependant resistor mounted on the flight deck compensating for all displays in a parallel-parallel format c) manual adjustment by flight crew on EFIS controller The correct answer is a 7.

The input bus into a central processor unit is a a) one way bus b) bi directional bus c) two way bus

The correct answer is a 8. A method used in modern aircraft for reporting in flight faults to an engineering and monitoring ground station is a) TCAS II b) ACARS c) TAWS The correct answer is b Aircraft Electricity and Electronics Eismin 5th Edition Page 299 9.

A CRT display has the advantage over an LCD display by a) brighter clearer output b) more energy efficient c) large viewing angle


Most fibre optic connectors are designed so

a)

the receptacle has to torque to a designated torque to ensure correct

b) c)

the connectors can not be over tightened the connector can not be replaced on the aircraft

alignment

The correct answer is b

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1.

The self test function on an EFIS system can be tested a) in the air only b) on the ground only c) in the air and on the ground


Each of the symbol generator outputs in an EFIS system can be a) displayed of each individual display b) only no. 2 can be displayed on the no.1 c) can not be interchanged


An AND gate with inverted inputs and an inverted output is equivalent to a) an AND gate b) an OR gate c) a NOR gate


Logic gates internal operating mechanisms are produced from a) thin film resistors b) transistors c) diodes


To display a circle on a CRT you use a) 2 sine waves 180 degrees out of phase b) 2 sine waves 90 degrees out of phase c) 2 square wave 90 degrees out of phase


The light source used in fibre optics is a) higher bandwidth than visible light b) lower bandwidth than visible light c) visible light

The correct answer is b Introduction to Fiber Optics J Crisp Page 18/19 7.

When the power is removed from a bi-stable memory device, it's memory will a) be lost indefinitely b) be saved indefinitely

c)

downloaded to memory


8.

BITE tests are inhibited for ground use during a) take-off b) gear retraction c) forward motion


9.

Software changes come under the responsibility of a) the national aviation authority b) the aircraft constructor c) the engineer

The correct answer is b AWN 45

10.

A multiplexer a) takes many signals in and converts it to a serial transmission output b) takes one signal in and converts it to a parallel transmission output c) takes many signals in and puts these in a parallel transmission on the

output The correct answer is a

----------------------------------------------------------

1.

The CPU consists of a) register and arithmetic logic unit only b) ALU, timing and control section, register c) register, timing and control section only

The correct answer is b Aircraft Instruments and Intergrated Systems EHJ Pallett Page 153 Basic CPU,. Aircraft Electricity and Electronics Eismin 5th Edition Page 145 2.

The ARINC 429 system uses the following system to transfer data a) non return to zero b) harvard bi phase c) bi-directional return to zero

The correct answer is c http://www.condoreng.com ARINC 429 tutorial 3.

Which of the following ARINCs are bidirectional? a) 429 b) 629 c) 573

The correct answer is b Aircraft Electricity and Electronics Eismin 5th Edition Page 148. http://www.condoreng.com ARINC 429 tutorial

4.

Data is transferred on the MIL-STD-1553B by using a) bipolar return to zero b) manchester bi-phase c) non return to zero

The correct answer is b http://www.condoreng.com MIL-STD-1553 tutorial 5.

The general arrangement of ARINC 629 includes a) current mode coupler, data bus cable only b) data bus cable, stub cable, voltage mode coupler c) data bus cable, current mode coupler, stub cable

The correct answer is c 6. tube

To deflect the beam of a CRT horizontally, coils are placed on the neck of the a) b) c)

one on the side, one at the bottom each side top and bottom


During flight (non fault conditions) the EICAS system displays on the lower CRT a) secondary engine parameters b) synoptic display c) flight phase page


Who can design new software? a) BCAR section A8 approved company b) BCAR section A1 approved company c) The CAA

The correct answer is a AWN45a para 3.1.3 (BCAR section A sub section A8) 9.

Data bus cables are terminated using a) 130 ohms resistor b) 100 ohms resistor c) 25 ohms resistor

The correct answer is a 10. Modern aircraft with electronic displays would display information on airframe and engine on which system? a) Flight management system b) Electronic centralised aircraft monitoring system (ECAM) c) EADI The correct answer is b

----------------------------------------------------------

1.

The Flight data recorder starts recording

• • •

a) b) c)

after take off on aircraft roll out from stand after the first engine has started

The correct answer is c JAR OPS Supbart K 1.715 e 2. • • •

Data to flight data recorder can be taken form a communal data bus if a) it goes directly to it b) the power is within flight data recorder limits c) if source isolation has been considered

The correct answer is c 3. In arinc 429 data field is bits 11 to 28. If the bits 11 to 18 had pad bits, the L.S.B. Of the data would be • a) bit 19 • b) bit 11 • c) bit 28 The correct answer is a 4. • • •

The BCD data field of arinc 429 is contained within bits a) 1-8 b) 11 - 29 c) 11-28

The correct answer is b Binary Word is 11 - 28. BCD Word is 11 - 29 5. After attaching a wrist strap to you wrist (which is connected to aircraft ground), prior to removal of ESDS equipment, the resistance measured • a) between the strap and the pin ground must be >10 Megohms • b) between your skin and the pin ground must be <10 megohms • c) between the strap and the pin ground must be <10 meghms The correct answer is b Answer found in Boeing SWPM. 20-41-01 3(2) (e) Hold the red lead of the (test) meter between the forefinger and the thumb. The acceptable range is less than 10,000,000 ohms 6. • • •

The major source of degradation of HIRF protection is a) corrosion b) damage to static wicks c) radio filter break down

The correct answer is c The exact definition of HIRF does not include electrostatc discharge (ESD). But only interference from outside sources. Understanding HIRF By Gerald L. Fuller 7. • • •

The resistance of the magnetic coils of a CRT. Is offset by using a) trapezoidal voltage b) constant voltage c) sawtooth voltage

The correct answer is a 8. If the magnetic deflection plates produce a magnetic field which is parallel to the horizontal then the trace is deflected in • a) horizontal axis

• •

b) c)

circular motion vertical axis

The correct answer is c 9. • • •

Light transmission in a fibre optic cable is due to a) repeated internal reflection b) refraction of the light c) defraction of the light

The correct answer is a 10. The name given to the joining of two fibre optic cables by aligning them carefully and bringing them into close proximity of each other is • a) Fusion • b) End to end • c) Lens Coupling The correct answer is b

----------------------------------------------------------

1. • • •

In a fibre optic cable a) only one data signal can be sent down it at any one time b) multiple data signals can be sent down it at one time c) data can only be sent in one direction

The correct answer is b Introduction to Fiber Optics John Crisp page 189 2. A logic 1 may be represented in an analogue system by (where Q is an output of a latch I flip-flop) • a) switch open I light on IQ • b) switch closed I light off / Not Q • c) positive I magnetised IQ The correct answer is c 3. • • •

A central fault display system should be available through a) a bite test b) a easily accessible multifunction control display unit c) a central bite test box with clear LED indications

The correct answer is b 4 An analogue to digital converter where it counts up to binary state eciual to the analogue in put and then back down when this is reached is a % a) successive approximation counter • b) a tracking ramp type converter • c) flash type converter The correct answer is b Digital Fundimentals T L Floyd page 571 5. •

Transistors are used in a current triggered D to A device to a) switch on the input

• •

b) c)

switch of the inputs change the state of the inputs


Radio altitude is displayed on an EFIS system a) on the Electronic Horizontal Situation Indicator b) on the Electronic Attitude Direction Indicator c) ontheRMI

The correct answer is b 7. • • •

A flight data recorder should be capable of recording a) the last 25 hours b) the last 25 hours of aircraft flight c) the last 25 hours with engines running

The correct answer is c 8. Op amps generally used in ADCs and DACs are normally % a) high input impedance, low output impedance • b) high input impedance , high output impedance % c) low input impedance , how output impedance The correct answer is a 9. • • •

Magnetic materials are used in a) ROMs only b) some RAMs c) EPROM


The pins on an op amp are numbered a) clockwise b) anticlockwise c) cross ways

The correct answer is b Basic Electronics Malcolm Plant Page 16D

----------------------------------------------------------

1. • •

A parallel register a) reads each bit to be stored simultaneously b) requires a clock pulse for each bit c) reads the stored data when logic 0 is applied to the read line

The correct answer is a 2. • . • •

HIRF protection is in the order of a) hardened skin and protecting wires I LRUs b) bonding as many parts of the aircraft as possible and a maximum resistance 0.05ohms c) periodically turn off components whilst radio transmitting

The correct answer is a The exact definition of HIRF does not include static build-up, but does include interference from outside sources. The protection from such interferenc is via the aircraft skin and wire/LRU shielding. Understanding HIRF, Gerald L Fuller 3. • • •

16 hexadecimal converted to decimal is equivalent to a) 38 b) 48 c) 22


a) • •

To get logic 1 using this gate

• A or B = 1 b) A and B = 1 c) A and B = 0


• • •

What logic gate would this circuit represent?

a) b) c)

NAND Gate NOR gate AND gate


Decimal 10 converted to binary is a) 1111 b) 1001 c) 1010

The correct answer is c Aircraft Electricity and Electronics Eismin 5th Edition Page 128 7. • • •

What systems uses base 10? a) Decimal b) Digital c) Octal

The correct answer is a Aircraft Electricity and Electronics Eismin 5th Edition Page 128 8. • • •

What systems use base 16? a) Octal b) BCD c) Hexadecimal

The correct answer is c Aircraft Electricity and Electronics Eismin 5th Edition Page 132 9. a)

EADI pointers, dials and engine data is produced using stroke

b) c)

raster electromagnetic waves

The correct answer is a Aircraft Instruments and Integrated Systems EHJ Pallett Page 300

10. a) b) c)

Fibre optic cables consists of a silica glass core and refractive outer cladding reflective outer cladding reflective inner cladding

The correct answer is a The outer cladding is glass, so it is refractive (but less so than the core). Cladding causes Total Internal Reflection (TIR), so question can be interpreted in two ways.

----------------------------------------------------------

1. • • •

The waveform to the coil of a CRT is a) trapezoidal b) ramp c) analogue

The correct answer is a 2. • • •

Analogue logic 1 is a) closed switch, Logic Q=0 b) closed circuit, Logic Q=1 c) open circuit

The correct answer is b 3. • •

ARINC 629 is transmitted using a) fibre optics or twisted pair of wires b) single wire for each transmitter c) SWG 28 wire

The correct answer is a Aircraft Electricity and Electronics Eismin 5th Edition Page 148 4. • •

BITE for ground use only is switched off a) when breaks are released b) when undercarriage up c) on take-off


Fibre optics relies on a) fibre absorbing light b) light reflecting off cladding c) light escaping cladding

The correct answer is b 6. •

The "light" emitted from a LED used within a fibre-optic system will have a wavelength a) slightly longer then that of visible light

• •

b) c)

slightly shorter then that of visible light equal to that of visible light

The correct answer is a Infrared from 850nm. Visible light is 400 - 800 nm 7. • • •

Binary coded decimal (BCD) format has a minimum of a) four "Os" or "1s" b) 2lotsoffour"0s"or"1s" c) 3 lots of four "Os" or "1 s"


A simplex system has a) 1 transmitter and multiple receivers b) 1 bus controller and 1 remote terminal c) 1 bus controller and multiple receivers


Fibre optic cable over copper cable has the following advantages a) non-conductive, easier to manufacture and assemble, greater bandwidth b) non-conductive, greater bandwidth, greater signal security c) greater bandwidth, greater signal security, more robust


An EFIS system ADI displays pitch, roll a) autoland, altitude, compass rose and flight director bars b) autoland, decision height, range to altitude and flight director bars and slip indicator c) autoland, rad alt, decision height and slip indicator


----------------------------------------------------------

1.

What is the Hexadecimal number F86 in Binary? a) 111110000110 b) 111110000001 c) 3974

The correct answer is a Convert it to Decimal first (15 x 256 + 8 x 16 + 6 x 1) = 3974. Since it is an even number, it must be the answer with a zero on the end. 2.

What is 11000012 - 1011002? a) 1101112 b) 100011012 c) 1101012

The correct answer is c Aircraft Electricity and Electronics Eismin 5th Edition Page 1129 3. During normal functioning of an ECAM system the engine data shown on the Engine/Warning display comes from the a) EFIS channel of DMC3

b) c)

ECAM channel of DMC1 ECAM channel of DMC3

The correct answer is b DMC 1 (in normal operation) supplies info the the upper ECAM, DMC 2 supplies info to the lower ECAM and DMC 3 is in standby 4.

To create a bi-directional communications link within an ARINC 429 system a) only one databus is required b) two databuses are required c) four databuses are required


Using I.N.S. an aircraft flies a) course directed by ground station b) great circle route c) rhumb line


What warnings can an FMS provide? a) Discrete warnings b) Spurious faults c) Ground faults only


Aircraft heading (HDG) is a) the angle between True North and the desired track b) the angle between True North and the actual track c) the angle between True North and the longitudinal axis of the aircraft

The correct answer is c Aircraft Instruments and Integrated Systems EHJ Pallett Page 254 For an IRS System to pass the ‘Alignment System Performance Test’ the a) entered present latitude and longitude must agree with the latitude and longitude at last power down b) the No 1 and No 2 must both have the same latitude and longitude present position entered c) the latitude entered must be within given limits of the latitude computed by IRU 8.

The correct answer is c Aircraft Intruments and Integrated Systems, Pallett pages 279-280 9.

The accepted error from INS / IRS is a) 2 miles / hour + 3 miles b) l mile / hour + 3 miles c) 3 miles / hour + 3 miles


track

Control Display Unit (CDU ) selection of TKE (Track Angle Error), displays a) distance perpendicular from the selected track b) difference in degrees that the aircraft is to the right or left of the desired

c)

difference in degrees from True North in a clockwise direction from the

desired track The correct answer is b Aircraft Instruments and Integrated Systems EHJ Pallett Page 256

----------------------------------------------------------

1.

In the EICAS system, when is the maintenance mode available? a) On the upper and lower screens - only available on the ground b) Lower screen only - only available on the ground c) In flight

The correct answer is b B747 Maintenance Manual. Aircraft Instruments and Integrated Systems. Pallett Page 380 2.

On a modern aircraft when are BITE checks carried out? a) When BITE selected b) After engine shut down c) Continuously when system is in use

The correct answer is c Aircraft Electricity and Electronics, 5th edition, Eismin, Pages 152 and 268 3.

What causes the X and Y beam deflections in an EFIS CRT display? a) Electromagnetic b) Electrostatic c) Either

The correct answer is a Aircraft instruments and integrated systems (Pallett), page 286 4.

In an IN system, the purpose of the stable platform is to a) prevent unwanted acceleration affecting the accelerometers b) provide attitude reference c) stop the gyros from toppling

The correct answer is a Aircraft Instruments and Integrated Systems EHJ Pallett Page 260 5.

The three accelerometers on a stable platform are mounted a) parallel to each other b) orthogonally c) 12Oo apart


An IN system requires data from the a) doppler system b) satellites c) air data computer

The correct answer is c Jeppesen Avionics Fundamentals Page 138 7.

XTK (cross track) is the

a) b) c)

angle in degrees that the aircraft track is left or right of desired track actual track across the earth’s surface perpendicular distance from the desired track

The correct answer is c Aircraft Instruments and Integrated Systems EHJ Pallett Page 256 8.

The output of an INS can be fed to a) vertical speed indicators b) attitude indicators c) altimeters

The correct answer is b Aircraft Instruments and Integrated Systems EHJ Pallett Page 247 fig 10.1. Jeppesen Avionics Fundamentals Page 137 & 138 9.

The three accelerometers on a strapdown platform are mounted a) parallel to each other b) 90o to each other c) 120o apart


Gyro-compassing is the term used for a) self-alignment in azimuth b) self alignment in the vertical c) use of the gyro-magnetic compass system to align the platform

The correct answer is c Aircraft Instruments and Integrated Systems EHJ Pallett Page 280

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1.

Centralized Aircraft Monitoring System operates to a) perform in-flight and ground tests of aircraft systems by carrying out a

BITE b) c)

give red warnings and amber cautions to display system status perform in-flight BITE only

The correct answer is b 2. controlled by

The control of the speed or rate that the F/D Command bars move can be a) b) c)

position feedback rate or velocity feedback amplifier gain

The correct answer is b 3. operation

The Centralized Aircraft Monitoring System uses the maintenance mode of a) b) c)

in the air only on the ground only either ground or air


Why does an ARINC databus system send data to LRUs in series? a) More information can be sent b) Takes less time c) Saves weight


Can an LRU transmit and receive on more than one 629 bus? a) Yes b) No c) Only if paralleled


ARINC 629 LRUs transmit a) when addressed b) when terminal gap is sensed c) when signal gap is sensed


How is multiplication achieved in an ALU? a) by addition b) by subtraction c) by coupling


What is the function of a status register? a) To indicate the status of the microprocessor b) To store a program during an interrupt c) To synchronise the clock pulse

The correct answer is a 9. An ADC uses advance approximation to a) increase resolution b) increase speed c) increase accuracy The correct answer is b

10. A DAC uses a precision amplifier to a) ensure the output voltages remain accurate b) ensure the input remains accurate c) compensates for the variation of the feedback resistor due to temperature The correct answer is a

---------------------------------------------------------1. A BCD word occupies bits 11-29, if 11-15 are filled with padders then the LSB of the word will be a) 16 b) 29 c) 11


If part of a display is lost on a CRT, this could be due to a) an inoperative symbol generator or input sensor b) an inoperative symbol generator or control panel c) loss of power to the CRT


3.

To reduce HIRF on radio equipment a) periodically check bonding leads for condition b) ensure all static wicks are in place c) transmit on all radio frequencies to determine which frequencies are causing the interference The correct answer is b

4.

When a BITE test is carried out on a system with moving parts it should be a) carried out without operating moving parts b) carried out ensuring all moving parts are operated and taken to there

stops c) mechanical stops

carried out ensuring all moving parts are operated but not to there

The correct answer is c Digital Avionic Systems - Cary Spitzer. Page 109, Arinc report 604 guidance for design and use of built in test equipment states... 'BITE should excercise the hardware sufficiently to determine if it meets the performance requirements but should not drive it against mechanical stops.'

5.

A simplex system has a) one transmitter, many receivers b) a bus controller and separate controller c) one transmitter, one receiver


6.

The smallest operation of a CPU is a) the timescale b) the processor sub-cycle c) the processor cycle


7.

In a fibre optic system, different light frequencies are separated by a) an active filter b) a passive filter c) a star network


8.

The most common CRT for an EFIS system screen is a a) electrostatic b) electromagnetic c) combined

The correct answer is c Boeing 757 MM 34-22-00 page 8 paragraph G (EADI), Section (2)........'It (the CRT) utilizes magnetic deflection and electrostaic focus control.'

9.

Sensors in a fibre optic flight control system a) require power for processors b) do not require power c) require processing to give output


An accuracy amp is used to a) give output at required level b) compensate for temperature variation c) make output between 0 - 5V

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1.

L.E.D.s can give a) high definition displays b) red and green displays only c) monochrome displays only

The correct answer is c LEDs can only ever give one colour (i.e. monochrome) as the colour is determined by the doping element and nothing else. LEDs which appear to give two colours are actually two separate LEDs in the same case.

2.

Fibre optic systems can transmit data in a) one direction only b) in two directions c) both directions at the same time

The correct answer is c Introduction to Fiber Optics John Crisp page 189

3.

When handling a PCB you should ensure that a) b)

electrical power is isolated ground yourself first to aircraft then PCB

c)

ensure you do not touch the ends so that copper contacts do not become

contaminated The correct answer is a CAAIPs Leaflet 9-4 8.1 (a) 4. you use?

For large bandwidth high-speed fibre optic transmission what sort of cable would

a) b) c)

Single mode Graded index Step index


In an R-2-R ladder converter the values of resistors a) are precise b) c)

do not need to be of precise values only the first resistor need to be precise

The correct answer is a Basic Electronics Malcolm Plant Page 60D 6.

In fibre optics the wavelength of the light is a) b) c)

less than visible light more than visible light equal to that of visible light

The correct answer is b 7. fibre optics

What is the advantage of an ILD over an LED when used as a light source in a) b) c)

higher bandwidth lower frequency range lower intensity

The correct answer is b Introduction to Fiber Optics John Crisp. A Laser Diode has a lower spectrum of frequencies hence reduce chromatic dispersion.

8.

A typical example of a mass storage device is a) b) c)

CD ROM IC magnetic tape


A typical example of an IC is a) b) c)


ALU CPU dip switch

10.

A circular time constant produces what sort of output ? a) in phase b) 180o out of phase c) 90o out of phase


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1.

Speed of light in a fibre optic fibre a) is always the same no matter what material it is b) is never greater then the speed of light in free space c) increases if it passes through material of higher refractive index

The correct answer is b Fiber Optics Communication and Other Applications Page 15 2. is

A device, which converts serial to parallel and parallel to serial for arithmetical functions,

a) b) c)

Multiplexer and De-Multiplexer Shift Register Parallel to serial and serial to parallel converter

The correct answer is b Pulse code modulation/parallel to serial 3.

In an Arinc 429 Word label-representing heading is 320, this is represented in bits 1- 8 as a) 01101000 b) 01011001 c) 00001011

The correct answer is c Octal 320 converted to binary. 4.

What would be the outputs if A=0 B=0 C=1

a)

0, 1

b) c)

1, 1 0, 0

The correct answer is a Check out the table on http://www.play-hookey.com/digital/adder.html 5.

What would be the outputs if A=1 B=1 C=0

a) b) c)

0, 1 1, 1 1, 0

The correct answer is c Check out the table on http://www.play-hookey.com/digital/adder.html 6.

The angle of incidence of a beam of light in a fibre optic cable will be a) twice that of the cone of acceptance b) approximately half that of the cone of acceptance c) parallel with the end of the cable

The correct answer is b Fiber Optics Communication and Other Applications Page 46/7. Presumably, this means the MAXIMUM angle of incidence. 7. A fibre optic cable is connected to a unit that will not be frequently disconnected. The preferred type of connector to be used is a a) Ball lens type b) Butt type c) Quick disconnect type The correct answer is b Boeing 777-200 training notes

8.

A cyclic test (watch dog) should be performed for ECAM a) during power up b) during flight c) via MCDU

The correct answer is b Aircraft Electricity and Electronics, Eismin, 5th Edition. Pg 154 9.

How is the symbol generator detecting the program error a) looking at the odd parity without error

b) c)

looking at the even parity without error check sum bites for error detect


What is EPROM? a) erasable programmable read only memory b) enhanced programmable read only memory c) erasable programming read only module

The correct answer is a Basic Electronics Malcolm Plant Page 87E

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1. A CRT is a) electromagnetic b) electrostatic c) solid state The correct answer is a A CRT is NOT solid state. Most CRTs used on aircraft are electromagnetic. 2. What is used for the power of 10? a) octal b) digital c) decimal The correct answer is c Decimal is a power of 10 counting system 3. a) b) c)

What is 44 in hexadecimal? 2c 2d 2F

The correct answer is a (2 x 16) + (12 x 1) = 44 (c = 12) 4.

What is octal 33in hexadecimal? a) 22 b) 11 c) 1b

The correct answer is c Octal 33 = (3 x 8) + (3 x 1) = 27 decimal. 27 = (1 x 16) + (11 x 1) = 1b (b = 11) 5. a) b) c)

At low ambient temperatures, an LCD screen loses contrast is slower to update as data changes viewing angle becomes larger

The correct answer is b See http://www.arundisplay.co.uk/glossary/lcd_technology.htm 6. a) b)

Colour CRT shadowmask screen resolution is 84 triads 400 lines per square inch

c)

600 lines per scan

The correct answer is a See http://www.lgeservice.com/monterms.html for definition of resolution (pixels per inch) and triads. The actual figure of 84 is irrelevant (as there are many different CRT resolutions). The question is asking whether you know the definition of resolution 7. a) b) c)

A multiplexer in test equipment could be used for analogue to digital converter frequency divider digital to analogue converter

The correct answer is a 8. a) b) c)

Where does the clock signal in a micro processor come from? ALU Control unit Memory

The correct answer is b Aircraft Instruments and Integrated Systems, Pallett. Page 153 9. a) b) c)

Where is the operating program for the CPU stored? ALU Control unit Memory unit

The correct answer is c Aircraft Instruments and Integrated Systems, Pallett. Page 153 10. a) b)

An LCD display has three colours only has infinite colours

The correct answer is a An LCD display uses only red, green and blue filters. By mixing them, it can get different colours, but not an infinite amount.

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1. In ARINC 629 aperiodic mode, LRUs transmit in order of a) power up b) shortest terminal gap to longest terminal gap c) longest terminal gap to shortest terminal gap The correct answer is b 2. ARINC 629, aperiodic mode is used a) for normal operation b) for landing and approach operation c) for database loads The correct answer is a 3. What is the device used to convert Binary Coded Decimal into separate supplies for a seven segment digital display? a) Multiplexer

b) c)

Demultiplexer Decoder

The correct answer is c RS catalogue...part number CA3161 (see www.RSwww.com website and enter the part number in their search box) 4. a) b) c)

How is ARINC 429 bi-directional data transfer achieved? Via a twisted pair of shielded cables Using two data buses Via a current mode coupler


A basic computer would consist of a) register section, ALU and timing and control section b) memory, input/output ports and CPU c) RAM/ROM and input/output ports

The correct answer is b Pallett Aircraft instuments & Integrated Systems Page 153 6. ABS 000 01 1 101 1 1 0 This is the truth table for a a) E-OR b) NOT c) NAND The correct answer is a E-OR is another name for XOR (in the twisted CAA mind!) 7. a) b) c)

Where is the rising runway? EADI EFIS CRTs in the passenger cabin

The correct answer is a 8. a) b) c)

What is ILS marker frequency? 75 Mhz 100 Mhz 125 Mhz

The correct answer is a Jeppesen Avionics Fundamentals Page 218 9. a) b) c)

On an external power socket the two short pins are for the AC interlock circuit to prevent arcing when inserting and extracting the socket used to act as a guide

The correct answer is b Pallet Aircraft Electrical System 3rd Edition page 72. Trick question, it is a DC interlock 10. a) b) c)

Flat plate antenna is series of waveguides with slots a parabolic antenna used to transmit RF signals only


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1. Relationship of CMCs to BITE systems is best described as a) CMCS replaced but is not related to the older BITE system. b) CMCS monitors the individual BITE systems and presents data. c) CMCS modifies and upgrades BITE systems The correct answer is b 2. Operation of a frequency counter is such that a) it changes the incoming waveform to a standard square wave. b) It detects incidences of peak value c) It compares the incoming waveform with standard sine waves The correct answer is b 3. As far as a software product is concerned a) the 'Verification' phase includes performance testing a programmed EPROM b) the 'Validation' phase is done to the software rather than to the component. c) the 'Software Release' phase is the same as the 'Finished Product' phase The correct answer is a 4. A segmented configuration for the display of alphanumeric date requires a) at least 13 segments for all upper and lower case letters b) the starburst display for numbers and lower case letters only. c) 16 segments to display the full range of capital letters and numerals The correct answer is c 5. For braided cables, the amount of braiding a) is a trade-off design feature b) must conform to the requirement for the shielding to cover at least 50% of the surface of the cable c) keeps radiated power inside the emitting assembly or away from the susceptible circuit The correct answer is c 6.

Electronic CRT beam display is used typically in a) IRU control display units. b) distance measuring indicators; digital counters c) weather radar indicators


What is the quickest method of analogue to digital conversion? a) Voltage to frequency b) Flash converter c) Single ramp method

The correct answer is b Digital Fundamentals by Thomas L Floyd 8.

In a colour cathode ray tube, how is the phosphor arranged in the tube? a) A red layer on the front with two green layers behind it b) Layers of red, blue and green c) A single phosphor layer containing red, green and blue

The correct answer is c Success in Electronics By Tom Duncan p285 9.

An LCD which is back lit is a) monochrome b) three colours c) multicoloured

The correct answer is c LCDs have 3 colours (RGB) which can be blended to make other colours (of limited number) 10.

An 8 data input multiplexer has how many Data select lines a) 3 b) 2 c) 8

---------------------------------------------------------1. An electronic flight instrument display consists of; a) ADC, Altimeter, VSI and ASI b) Mode control panel, Raster and Stroke generator display, microprocessor and Data inputs c) ADI, HSI and Symbol generator The correct answer is b Automatic Flight Control by EHJ Pallett and Shawn Coyle page 268 2. An octal format hexadecimal number 3F written as binary would be a) 101 011 b) 110 111 c) 111 111 The correct answer is c 3. What is a passive device ? a) Matrix LCD b) Capacitor c) LED The correct answer is b 4. A priority encoder a) Outputs the selected input b) Outputs the highest input c) Outputs the lowest input The correct answer is b

5. The data format use to transmit signal to flight data recorder a) Manchester 2 bi-phase 12 bit b) Harvard bi-phase 12 bit c) Bi-Polar RZ 12 bit The correct answer is b 6.

The output voltage of arinc 429 signal is a) +5v b) -5v c) +10v to -10v

The correct answer is c See ARINC 429 tutorial (in FORUM module 5). 7.

How many bytes can be carried in a 32bit word a) 4 bytes b) 2 bytes c) 8 bytes

The correct answer is a 8 bits per byte 8.

An Arinc 629 label word is a) 12 bits b) 8 bits c) 10 bits

The correct answer is a 12-bit label field, 4-bit label extension, single parity, 3-bit time hi-lo synch pulse. 20 bit in total 9. voltage?

Which of the following ESDS devices can withstand higher static electricity a) b) c)

ECL MOSFET SCR


An IRU interface test is carried out a) only on the ground b) in the air c) on the ground or in the air

---------------------------------------------------------1. For a computer to start up the basic instruction is from the • a) ALU • b) RAM • c) ROM The correct answer is c 2. • •

What is a passive device a) Matrix LCD b) LED

•

c)

Capacitor

The correct answer is c 3. • •

A backlighted LCD a) has infinite colours c) has only 3 colours

The correct answer is c A backlighted LCD has only 3 colours (RGB) but can mix them to make others (but not an infinite amount) 4. • • •

An example of a small size integrated circuit would be a) DIP switch b) ALU c) Control Processor Unit

The correct answer is c A DIP switch is not an IC. ALU is an integrated part of the CPU. The 'Control Processor Unit' is another term used for the 'Central Processor Unit (CPU)' or sometimes a switching unit used in telegraphy (such as the touchpad of a telephone) - the latter would be an SSI (defined as containing up to 100 transistors or gates). 5. • •

The smallest operation possible in a computer is the a) timing cycle b) processor sub-cycle c) processor cycle

The correct answer is a Also known as the clock pulse 6. a) b) c)

A common used material in computer manufacturing is ferrite material permeamag material ferromagnetic material

The correct answer is c Ferromagnetic material is that which hard-drives and floppy drives are made from 7. a) b) c)

FMS system gives warning indications for cruise take off and landings only any flight phase


An aircraft on an ILS approach is below the glideslope centre line, the glideslope pointer is a) above the centre line b) below the centre line c) level with the datum


A dot matrix/LED construction is a) 4x7 or a 9x5 rolling end display b) 4x7 or a 5x7 rolling end display c) 5x9 or a 4x7 rolling end display

The correct answer is a Aircraft Instruments and Integrated Systems Pallett Pages 13 - 15 (Although, in the real world, others are available too). 10. • • •

FMS CDU warnings are a) OFST and Fail b) fail and MSG c) MSG, fail and OFST


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1. A current mode coupler contains E core assembly. The purpose of the E core is a) couple the signal to the data bus • b) provide effective screening of the signal through the current mode coupler c) enable easy access for monitoring purposes The correct answer is a 2. • • •

Testing of CADC can be carried out a) in the air b) ground only c) air and ground


EHSI information displayed, is invalid in the pre-set heading mode when a) flags out of view b) flag green c) flag in view


CMC (central maintenance computer) works to a) perform in-flight bite and ground tests of aircraft systems, i.e. BITE b) give red warnings and amber cautions to display in accordance with system status c) perform in-flight bite only


TheTX/RXofArinc629is a) encoder/decoder b) multiplex/de-multiplex c) switching

The correct answer is b 6. •

Terminal gap in ARINC 629 is a) always the same period b) flexible c) can be changed by adjusting the rxftx software

The correct answer is c Aicraft Electricity and Electronics, Eismin 5th Ed, pg149

7. •

DRAM a) requires a refreshing charge b) memory is stored when power supply is removed c) it does not require a refreshing charge

The correct answer is a http://computer.howstuffworks.com/ram4.htm 8. What is fB6 hex when converted to binary? • a) 1000010000110 • b) 100000000000 • c) 111110000110 The correct answer is c 9. • •

BITE test carried out on input sensors and actuators performs a) atestoftheLRU b) a performance test of the system c) validation of the information of the LRU


A continuous balance ADC uses a) a closed loop system to compare the analogue input to give the required digital output b) a closed loop system to check the analogue input with the input sample c) successive approximation logic circuit to control the output

The correct answer is a Probably referring to a comparator feedback circuit.

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1. A BITE check for automatic performance and fault monitoring is carried out when? • a) Power-up self test • b) For in-flight monitoring • c) To check the performance of the LRU The correct answer is a 2. A clock pulse in processor equipment a) is used for the maintenance tests • b) is to give the correct timing when calculations are made • c) is to synchronise everything The correct answer is c 3. • • •

The EFIS system consists of a) EADI, EHSI, Symbol generators b) Mode control Panel, RDMI, EHSI c) EHSI, Mode control panel, EADI


In a computer, the address 3B8 is

• • •

a) b) c)

decimal octal hexadecimal


In a optical fibre, the angle of acceptance is a) equal to the cone of acceptance b) 1/2 the cone of acceptance c) 1/2 the signal wavelength

The correct answer is b Introduction to Fiber Optics John Crisp page 29 6. • • •

The signal sent between a MUX/DEMUX is controlled by: a) the ALU b) control unit c) clock


In a computer, the code that fetches correct data and feeds it to the ALU is called a) the computer program b) the instruction set c) ARINC

The correct answer is b http://www.webopedia.com/TERM/I/instruction.html 8.

What is this?

a) Multiplexor b) Shift register c) Counter The correct answer is a

9. • • •

Bubble memory stores data on a) ferrite disk b) ferrite core c) magnetic tape

The correct answer is a (closest answer) See www.tpub.com/neets/book22/92a.htm 10. • • •

Ferrite medium is used because a) data is stored after the power is removed b) it has low eddy current losses c) it is light


----------------------------------------------------------

1. A dynamic EPROM • a) requires constant refreshing b) is non-volatile memory c) is erased after reading The correct answer is a 2. A computer requires to operate a) data bus, control bus, address bus • b) data bus, control bus • c) address bus, data bus The correct answer is a 3. • • •

A computer processor has within it a) ALU, control section, register b) register, buffer, data bus c) ALU, register, memory


when using aTDR (time delay reflecto meter) the loss value of the cable is: a) set on the TDR b) shown by the curve c) allowed for in the calculation

The correct answer is b http://www.tscm.com/riapp1.html 5. • • •

Common aircraft fibre optics uses a) modulating intensity on direct read b) modulating frequency on direct read c) modulating intensity on indirect read

The correct answer is b Intensity of light cannot be changed with an LED 6.

What manoeuvre does TCAS II advise the pilot to make

• • •

a) b) c)

TA RA either RA or TA


What are the shapes of traffic shown on a TCAS display? a) White diamonds, red squares and amber circles b) White squares, red diamonds and amber circles c) White circles, red diamonds and amber squares

The correct answer is a 8. • •

What is a Grays converter? a) Digital to Analogue b) Analogue to Digital c) Analogue to Analogue


Data memory is usually stored in a) RAM b) ROM c) EEPROM


Tristate devices are found a) on input circuits b) on output circuits c) on both input and output circuits


----------------------------------------------------------

1. AWN 45 requires that • • •

a) b) c)

The aircraft operator be responsible for software assessment The aircraft constructors be responsible for software assessment The CAA be responsible for software assessment


What is the main cause of attenuation in fibre optics? a) Refractive index b) Poor termination c) Bends in the cable


What are the advantages of an LCD display over an LED? a) It is brighter b) It uses less current

•

c)

There are no advantages


If a dislay shows a red cross only, it is due to a) CRT failure b) Symbol Generator failure c) Altimeter failure


What is the advantage of a laser diode over an LED? a) Greater bandwidth b) Narrower bandwidth c) There are no advantages

The correct answer is b Introduction to Fiber Optics John Crisp Page 65 6. • •

How does ARINC 629 bus transmit and receive information? a) Optical coupling b) Sockets and pins c) Inductive coupling


What is ARINC 561 used for? a) To specify Flight Data Recorder data bus b) To specify Radio Comms data bus c) To specify LRU pin-outs

The correct answer is b No correct answer here, as 561 is for INS. 8. • •

Sample and hold is atechnique used in a) D to A convention b) AtoD convention c) Moving coil instruments


ACARS is an acronym for a) Analogue Communications Airborne Radio System b) Airborne Communications Addressing and Reporting System c) ARINC Communications Addressing and Reporting System


What are the colours of traffic shown on a TCAS display? a) White diamonds, red squares and amber circles b) White squares, red diamonds and amber circles c) White circles, red diamonds and amber squares


----------------------------------------------------------

1. Level 1 software failure • a) is defined as critical and can lead to loss of aircraft • b) is defined as essential and will reduce safety margins • c) is defined as essential and may have a minor effect The correct answer is a 2. •

A wrist band must be worn when working with ESDS devices a) to prevent the operator from getting an electric shock b) to dissipate static charge on the device c) to dissipate and prevent static build-up on the operator

The correct answer is c 3. •

A humid atmosphere a) eliminates static charge b) reduces static charge c) has no effect on the level of charge


Control of aircraft software updates a) is the responsibility of the certifying engineer b) is the manufacturer responsibility c) is identified by LRU pin-out changes

The correct answer is a 5. • •

The arithmetic logic unit (ALU) in a central processor unit (CPU) carries out a) addition, subtraction, multiplication and division b) timing and synchronisation c) computations as instructed

The correct answer is c 6. •

A seven segment display is used to a) display octal and binary numbers only b) display octal and decimal numbers only c) display alpha-numeric characters


What sort of gate requires two negative input voltages to operate? a) NOT b) XOR c) NAND


A high level language statement is usually equivalent to several statements in a) assembly b) basic c) pascal


9. • •

The CPU requires a clock to determine a) the speed of operation b) the date and time c) the number of bits on the highway


An ALU performs the following a) Arithmetic, Logic, Branch and Move Operations b) Arithmetic, Logic, Branch and Find Operations c) Input/Output operations, Arithmetic, Logic Functions


---------------------------------------------------------1. HIRF is acronym for • a) High Intensity Radiated Field • b) Heavily Ionised Radio Frequencies • c) High Intensity Radio Frequencies The correct answer is a 2. • • •

An asynchronous system a) uses a clock pulse after a settling time to input data b) provides data real-time without the need for a clock pulse c) both a and b depending on the system


What is the purpose of the parity bit on an ARINC 429 bus? a) To indicate if the data is analogue b) To indicate that the data is digital c) To indicate to the receiver that the data is valid

The correct answer is c 4. a) b) c)

An analogue to digital converter (ADC) requires the following: a reference voltage, an input gate, an internal counter a reference voltage, an input gate, an internal counter, a comparitor a reference voltage, an input gate, a comparitor


When does the flight data recorder start recording ? a) When the first engine starts b) Parking brake released c) Undercarriage up

The correct answer is a Flight Instruments and Automatic Flight Control Systems 6th Edition David Harris Page 172 6. • •

ILS indications on PFD/ND are shown in a) cyan b) magenta

•

c)

green


The four distinct sections of a digital system are: sense, decide a) divide and store b) divide and ship c) act and store


Brake temperature displayed on a flight deck CRT has a) same colour throughout b) different colour for different temperatures c) a master warning light


When does the lateral deviation scale flash? a) When the localiser rx is faulty b) When the aircraft is out of range c) When the deviation is excessive


M05 Q&A

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