Tests T ests and Measurem Measurements ents 1. What kind of instrument an ammeter is? A. An indicating •
B. A recording
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C. An integrating
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D. A dc meter
2. As the deection of the moving system increases the contro!!ing tor"ue tor"ue in an indicating instrument. •
A. #emains the same B. Increases
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C. Decreases
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D. Becomes $ero
%. Which is the &est ty'e of meter movement? •
A. (ron)*ave
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B. Dynamometer C. D’ Arsonval
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D. Moving iron
+. Which dynamometer ty'e has uniform sca!e? A. Wattmeter •
B. ,o!tmeter
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C. Ammeter
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D. -hmmeter
. When &oth deecting and contro!!ing tor"ue tor"ue act the 'ointer of an indicating instrument comes to A. Rest •
B. Mid)'osition
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C. Ma/imum 'osition
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D. Three)fourth 'osition
0. The out'ut vo!tage of a thermocou'!e •
A. #emains constant *ith tem'erature
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B. Decreases *ith a''!ied vo!tage C. Increases with temperature
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D. (ncreases *ith a''!ied vo!tage
. An instrument in *hich the magnitude of the measured "uantity is indicated &y means of a 'ointer A. Analog instrument •
B. Digita! instrument
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C. Ammeter
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D. ,o!tmeter
. (f the 'ointer of an indicating instrument is in motion then *hat o''oses deecting tor"ue? •
A. Contro!!ing tor"ue
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B. Dam'ing tor"ue C. Damping and controlling torques
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D. 3rictiona! tor"ue
4. 5o* can e!ectrica! currents &e inducted *ith a coi! and a magnet? •
A. By '!acing the coi! 'ara!!e! to the magnetic 6e!d
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B. By '!acing the coi! at right ang!es *ith the magnetic 6e!d C. By moving either the magnet or the coil
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D. By kee'ing the coi! and the magnet 'erfect!y stationary
17. When shou!d a fuse &e re'!aced *ith a higher rated unit? A. Never •
B. When the origina! va!ue is not avai!a&!e
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C. (f it &!o*s
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D. When fuses of the origina! va!ue are sma!! in si$e
11. The 'ointer of an indicating instrument is genera!!y made of •
A. Co''er
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B. 8i!ver C. Aluminum
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D. 9o!d
12. The time interva! that a *aveform is high :or !o*; is the <<<<<<< of the signa!. A. ulse width •
B. =u!se !ength
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C. =u!se 'osition
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D. Duty cyc!e
1%. A Wheatstone &ridge is &a!anced if •
•
A. the ratio of resistors on one side of the &ridge is one *hi!e the ratio of resistors on the other side is in6nity B. the ratio of resistors on one side of the &ridge is greater than the ratio of resistors on the other side C. the ratio o! resistors on one side o! the "ridge equals the ratio o! resistors on the other side
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D. the &ridge uses identica! resistors
1+. The 'ointer of an indicating instrument is the 6na! deected 'osition the <<<<<<< is $ero. •
A. Deecting tor"ue
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B. Contro!!ing tor"ue C. Damping torque
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D. 3rictiona!
1. A moving system force in ana!og instruments *hich causes the moving system to deect from its $ero 'osition. A. De#ecting !orce •
B. Dam'ing force
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C. #eturn)to)$ero force
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D. Contro!!ing force
10. A moving force in ana!og instruments *hich ensures that the deection of the 'ointer for a given va!ue of measured "uantity a!*ays has the same va!ue. •
A. Dam'ing force B. Controlling !orce
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C. ># force
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D. Deecting force
1. A!! vo!tmeters e/ce't one of the fo!!o*ing are o'erated &y the 'assage of current. •
A. Moving)iron
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B. Dynamometer C. $lectrostatic
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D. =ermanent)magnet moving coi!
1. Disc is made of *hat materia! in eddy current dam'ing? A. Conductor and non%magnetic material •
B. Conductor and magnetic materia!
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C. >on)conductor and non)magnetic materia!
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D. >on)conductor and magnetic materia!
14. The time interva! &et*een 'u!ses is ca!!ed •
A. =u!se fre"uency B. ulse delay
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C. =u!se duration
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D. =u!se 'eriod
27. An osci!!osco'e 'rovides easy measurement of <<<<<<<<<< va!ues. •
A. instantaneous
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B. rms C. pea& to pea&
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D. average
21. An e!ement in e!ectrons *hich serves as a 'rotection against over!oad? •
A. #esistor
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B. Transistor
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C. 8emiconductor D. 'use
22. What sensor 'rovides a dc vo!tage a''ro/imate!y 1 , at 17 mW? A. Diode sensor •
B. Thermocou'!e sensor
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C. Therma! sensor
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D. Thermistor sensor
2%. 5ot)*ire instrument has a@an <<<<<<<<<< sca!e. •
A. uniform B. squared
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C. !ogarithmic
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D. e/'onentia!
2+. 3or time measurements <<<<<<< sca!e of the sco'e is used. A. hori(ontal •
B. diagona!
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C. vertica!
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D. &oth vertica! and hori$onta!
2. 3!uid friction dam'ing is em'!oyed in one of the fo!!o*ing •
A. Dynamometer *attmeter
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B. (nduction ty'e energy meter
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C. 5ot)*ire ammeter D. )elvin electrostatic voltmeter
20. Current range e/tension in moving coi! instruments can &e achieved &y '!acing a <<<<<<< in shunt *ith the instrument.
A. *ow resistance resistor •
B. 5igh resistance resistor
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C. 5igh vo!tage transistor
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D. Ca'acitor
2. =ermanent) magnet moving coi! instrument can &e used in •
A. ac *ork on!y
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B. &oth dc and ac *ork C. dc wor& only
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D. neither dc nor ac *orks
2. What C#T e!ement 'rovides for contro! of the num&er of e!ectrons 'assing farther into the tu&e? •
A. Cathode B. Control grid
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C. Anode
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D. =hos'hor screen
24. What refers to garaging t*o adustments of an AC &ridge together in such a *ay that changing one adustment changes the other in a s'ecia! *ay &ut changing the second adustment does not change the 6rst? •
A. ogarithmic nu!!ing B. +rthogonal nulling
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C. /'onentia! nu!!ing
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D. inear nu!!ing
%7. When the vertica! in'ut is 7, the e!ectron &eam may &e 'ositioned at the <<<<<<< of the screen •
A. to' center B. vertical center
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C. hori$onta! center
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D. &ottom center
%1. What is the reason *hy the sca!e of a 'ermanent)magnet moving coi! instrument is uniform?
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A. Because of eective eddy current dam'ing
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B. Because e/terna! magnetic 6e!d has no eect C. Because it is spring controlled
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D. Because it has no hysteresis !oss
%2. A sensing e!ement that 'rovides a dc vo!tage !ess than 17 m, *ith ty'ica! 'o*er range of 7.1 to 177 mW. A. ,hermal converters •
B. Therma! sensors
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C. Thermocou'!e sensors
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D. Diode sensors
%%. Tank circuit fre"uency can &e measured &y <<<<<<<<. •
A. ,o!tmeter
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B. 8igna! generator C. -rid%dip meter
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D. A&sor'tion meter
%+. 8hunts are genera!!y made of *hat materia!? •
A. Constantan
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B. 8i!ver
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C. A!uminum D. anganin
%. What meter is the most sensitive? •
A. 17 ma
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B. 1 ma
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C. 1A D. / 0A
%0. A dynamometer instrument is main!y used as a @an •
A. dc ammeter B. wattmeter
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C. dc vo!tmeter
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D. ohmmeter
%. Which movement is the most e/'ensive? •
A. DE Arsona! movement B. Dynamometer
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C. Moving)iron
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D. (ron)*ave
%. Attraction and re'u!sion instruments are considered as •
A. Moving)ce!! instruments B. oving%iron instruments
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C. !ectrodynamic instruments
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D. Dynamometer
%4. (n Wheatstone &ridge &ridge &a!ance is considered *here A. ,here is no current that #ows through the load •
B. There is current that o*s through the !oad
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C. There is 'otentia! dierence &et*een !oad termina!
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D. The ga!vanometer reading is ma/imum
+7. The tem'erature coeFcient of resistance of the shunt materia! is A. negligi"le •
B. negative
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C. 'ositive
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D. in6nite
+1. (n ,T,Ms <<<<<<<<<<< is used to &a!ance &oth ha!ves of the dierence am'!i6er or cathode)cou'!ed am'!i6er. •
A. trigger adust
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B. sca!e
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C. in6nite adust
D. (ero ad1ust
+2. (n an osci!!osco'e <<<<<<<< adusts the &rightness of the s'ot &y changing the vo!tage on the contro! grid. A. intensity control •
B. focus contro!
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C. astigmatism contro!
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D. 'osition contro!
+%. What force in ana!og instrument "uick!y &rings the moving system to rest in its 6na! 'osition? A. Damping !orce •
B. Contro!!ing force
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C. Deecting force
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D. 3orce at rest
++. The resistance of a moving)coi! instrument is 17 G and gives fu!!)sca!e deection at 17 mA. Ca!cu!ate the resistance of the shunt re"uired to convert the instrument to give fu!!)sca!e detection *hen the circuit current is A. A. 2.23224 5 •
B. 7.2777+ G
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C. 1 G
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D. 2.7+ G
+. A sma!! s*am'ing resistance is connected in series *ith o'erating coi! of a moving coi! ammeter in order to com'ensate for the eects of A. ,emperature variation •
B. 5ysteresis
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C. /terna! magnetic 6e!ds
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D. Tem'erature inversion
+0. The ty'ica! 'o*er range of diode sensor is •
A. 7.1 HW to 17 mW
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B. 7.1 'W to 17 mW
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C. 7.1 mW to 177 W D. 2./ nW to /2 mW
+. A <<<<<< o'erates on the magnetic attraction)re'u!sion 'rinci'!es •
A. 8'ectrum ana!y$er
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B. -sci!!osco'e
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C. 3ie!d strength meter D. illiammeter
+. What dc &ridge is *ide!y used for the accurate measurements of resistance? •
A. -*en &ridge
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B. 5ay &ridge
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C. =otentiometer &ridge D. Wheatstone "ridge
+4. Which of the fo!!o*ing is a dc &ridge that is very usefu! for making e/treme!y accurate vo!tage measurements? •
A. Wheatstone &ridge B. otentiometer "ridge
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C. Ie!vin &ridge
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D. -*en &ridge
7. Maority of ana!og measuring instrument uti!i$es one of the fo!!o*ing eects. •
A. 5eating eect
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B. !ectrostatic eect C. agnetic 6eld
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D. Chemica! eect
1. Mu!timeter ty'ica!!y 'rovides measurements of <<<<<<<<<< va!ues :for a sinusoida! *aveform;.
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A. 'eak B. rms
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C. average
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D. instantaneous
2. Dynamometer ty'e instrument can &e used for •
A. ac *ork on!y
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B. dc *ork on!y C. "oth dc and ac wor&
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D. neither dc nor ac *orks
%. What instrument *hich s'rings 'rovide the contro!!ing tor"ue as *e!! as serve to !ead current into and out of the o'erating coi!? •
A. Moving)iron B. ermanent%magnet
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C. 5ot)*ire
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D. (ron)*ire
+. (n ,T,Ms <<<<<<<<< refers to the sma!!est signa! that can &e re!ia&!y measured. •
A. thresho!d signa!
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B. minimum signa! C. sensitivity
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D. in'ut signa!
. The fre"uency of rotation in some rotating machinery can &e measured &y a •
A. ,T,M
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B. Tachometer
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C. 8'ectra! meter D. 7tro"oscope
0. Which of the items &e!o* descri&es an a&sor'tion meterEs usage? A. Chec& the output !requency o! a transmitter
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B. Monitors the out'ut current of a receiver
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C. Monitors the fre"uency ratio of a device
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D. 3re"uency generator
. What instrument is used for o&serving vo!tage and current *aveforms? •
A. Mu!timeter
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B. DMM C. +scilloscope
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D. Te!esco'e
. Which of the fo!!o*ing forces does not act on the moving systems of ana!og instruments? •
A. A deecting force
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B. A contro!!ing force
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C. A dam'ing force D. An electrostatic !orce
4. When current through the o'erating coi! of a moving)iron instrument is tri'!ed the o'erating force &ecomes •
A. si/ times
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B. one)ha!f time C. nine times
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D. three times
07. What is the ty'ica! fu!!)sca!e deection current of a moving coi! instrument? A. 82 mA •
B. 7 nA
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C. 7 HA
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D. 7 A
01. What instrument is used for measuring the amount of current o*ing in a circuit?
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A. ,o!tmeter B. Ammeter
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C. -sci!!osco'e
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D. Meter am'erage
02. What ty'e of meter gives a 'recise reading on vo!tage current or resistance *here there is the generation of sam'!es at the in'ut and then feeds it to a digita! read)out? •
A. ,-M
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B. ,T,M C. D
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D. DTM3
0%. What is the ty'ica! fu!!)sca!e vo!tage across a moving coi! vo!tmeter? •
A. 7 n,
•
B. 7 H,
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C. 7 , D. 82 m9
0+. What is the 'eriod of a re'etitive signa!? •
A. -ne)fourth cyc!e of the *aveform
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B. T*o cyc!es of the *aveform C. +ne cycle o! the wave!orm
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D. -ne)ha!f cyc!e of the *aveform
0. What e!ement of a C#T re!eases e!ectrons *hen heated indirect!y &y a 6!ament? A. Cathode •
B. 9rid
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C. Anode
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D. =hos'hor screen
00. Moving)iron instrument has *hat sca!e?
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A. Jniform
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B. ogarithmic C. 7quared
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D. /'onentia!
0. A 'attern dis'!ayed &y osci!!osco'es *hich has a steady characteristic is ca!!ed A. *issa1ous pattern •
B. >y"uist 'attern
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C. BarkhausenEs criterian
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D. 3ermatEs 'attern
0. A ga!vanometer *ith a 27 G coi! resistance has a fu!!)sca!e def!ection of 17mA. A 7.72 G is '!aced across the meter to increase its rating ca'acity. What is the ne* fu!!)sca!e current for the meter? •
A. 1.71 A
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B. 177.1 A
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C. 17.17 A D. /2.2/ A
04. Which of the fo!!o*ing e/tends the range of a moving)iron ac ammeter? •
A. A shunt
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B. A mu!ti'!ier C. Changing num"er o! turns o! operating coil
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D. A series
7. Which 'art of the fo!!o*ing is not a &asic 'art of a C#T? •
A. !ectron gun
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B. 3ocusing and acce!erating e!ements
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C. 5ori$onta! and vertica! deecting '!ates D. 7awtooth generator
1. 3or am'!itude measurements *hat sca!e is ca!i&rated in either vo!ts 'er centimeter :,@cm; or mi!ivo!ts 'er centimeter :m,@cm;.
•
A. 5ori$onta!
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B. Diagona! C. 9ertical
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D. ,o!tage
2. What ammeter is used to measure high)fre"uency currents? •
A. 5ot)*ire
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B. Moving)iron
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C. Dynamometer D. ,hermocouple
%. Which of the vo!tmeter is used for measuring high direct vo!tage :say 17k,;? •
A. =ermanent)magnet moving coi!
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B. 5ot)*ire C. $lectrostatic
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D. Moving iron
+. A common techni"ue for measuring 'o*er at high fre"uency is to •
A. em'!oy high 'o*er meter
•
B. use micro*ave meters C. employ a sensing element that converts the R' power to a measura"le dc or low%!requency signal
•
D. use thermocou'!e
. What 'rovides visua! dis'!ay sho*ing the form of the signa! a''!ied as a *aveform on the front screen of a cathode ray osci!!osco'e? •
A. Te!evision
•
B. Com'uter
•
C. Meter face D. CR,
0. !ectrostatic instruments are e/c!usive!y used as
A. voltmeters •
B. ohmmeters
•
C. ammeters
•
D. *attmeters
. What is the ty'ica! 'o*er range of thermocouple sensors •
A. 7.1 mW to 177 W B. 2./ 0W to /22 mW
•
C. 7.1 nW to 177 HW
•
D. 7.1 'W to 177 nW
. An e!ectric 'yrometer is an instrument used to measure •
A. 'hase B. high temperatures
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C. fre"uency
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D. 'o*er
4. Which instrument is the most sensitive? •
A. Moving)iron
•
B. Dynamometer
•
C. 5ot)*ire D. ermanent%magnet moving coil
7. Which is the most common!y used induction ty'e instrument? •
A. (nduction vo!tmeter B. Induction watt%hour meter
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C. (nduction *attmeter
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D. (nduction ammeter
1. What ty'e of instrument is the watt%hour meter ? A. An integrating •
B. A recording
•
C. An indicating
•
D. A 'o*er meter
2. A certain 'u!se measures 17ms and has a 'eriod of 7ms. The duty cyc!e is A. 32: •
B. 17K
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C. K
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D. 177K
%. (ndicating instrument is assumed to &e most accurate at *hat 'art of the sca!e? •
A. At &eginning B. At hal! o! !ull
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C. At ending
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D. Any 'art
+. -n a sim'!e ohmmeter the 7 G mark is !ocated <<<<<< of the sca!e. •
A. at far !eft B. at !ar right
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C. at ending
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D. any 'art
. -ne of the &asic functions of e!ectronic circuit is A. the generation and manipulation o! electronic waveshapes •
B. the creation of a signa!
•
C. the transmission of e!ectrica! signa!
•
D. the rece'tion of e!ectric signa!
0. What 'rovides a visua! 'resentation of any *aveform a''!ied to the in'ut termina!s? A. Cathode ray oscilloscope ;CR+< •
B. Cathode ray tu&e :C#T;
•
C. 8'ectrum ana!y$er
•
D. ,T,Ms
. The interva! of a 'u!se from start to end is the <<<<< of the 'u!se A. period •
B. *idth
•
C. 'osition
•
D. duty cyc!e
. Considered as the Lheart of the cathode ray osci!!osco'e. A. Cathode ray tu"e ;CR,< •
B. 8a*tooth generator
•
C. 5ori$onta! am'!i6er
•
D. ,ertica! am'!i6er
4. A materia! that g!o*s *hen struck &y the energetic e!ectrons in a C#T. •
A. A"uadag
•
B. 8i!icon
•
C. 9ermanium D. hosphor
47. What sensor 'rovides a change of resistance *ith ty'ica! 'o*er range of 1HW to 17mW and *ith ma/imum fre"uency greater than 17795$? •
A. Therma! converter
•
B. Diode sensor
•
C. Thermocou'!e sensor D. ,hermistor sensor
41. An ammeter *ith an interna! resistance of 7 G is used to measure a current through a !oad resistance #N 1 k G. Determine the 'ercentage error of the reading due to ammeter insertion. •
A. 0.+K
•
B. 0.+K C. 4.=>:
•
D. +.0K
42. Most AC vo!tmeters have an rms sca!e *hich is va!id on!y if the in'ut signa! &eing measured is a <<<<<<<< signa!. •
A. s"uare *ave
•
B. triangu!ar
•
C. sa*tooth D. sinusoidal
4%. Which of the fo!!o*ing &ridges measures dc resistance? A. Wheatstone •
B. Ma/*e!! &ridge
•
C. 5ay &ridge
•
D. 8chering &ridge
4+. What &ridge is used to measure high)O inductors :OP17;? •
A. Wheatstone &ridge
•
B. Wien &ridge C. ?ay "ridge
•
D. Ma/*e!! &ridge
4. Ma/*e!! &ridge measures an unkno*n inductance in terms of kno*n •
A. resistance
•
B. fre"uency
•
C. inductance D. capacitance
40. What is used for measuring medium O coi!s :1QOQ17;? A. a@well "ridge •
B. Wheatstone &ridge
•
C. Ie!vin &ridge
•
D. 5ay &ridge
4. What has a series #C com&ination in one arm and a 'ara!!e! #C com&ination in the adoining arm and used as a notch 6!ter in harmonic distortion ana!y$er? A. Wien "ridge •
B. Ma/*e!! &ridge
•
C. Ie!vin &ridge
•
D. 5ay &ridge
4. 8ensitivity of a vo!tmeter is e/'ressed in A. 5 9 •
B. G@A
•
C. ,@ G
•
D. ,@A
44. What is the sma!!est change in a''!ied stimu!us that *i!! indicate a detecta&!e change in deection in a indicating instrument ca!!ed? •
A. 8ensitivity
•
B. Accuracy C. Resolution
•
D. =recision
177. (nsu!ation resistance is measured &y *hich meter? •
A. -hmmeter
•
B. (nsu!ation meter
•
C. Wien &ridge D. egger
