AMATEUR CLASS “B” REVIEWER
Element 5
20. Emission in which the wave carrier is amplitude modulated, single side band reduce carrier, R
1.
If the radiation of the antenna is 500 ohms, the power radiated is 125KW, what is the antenna current? 5A
2.
Ratio of maximum deviation to modulating frequency. Modulation Index
3.
An example of the worst kind of antenna and transmission matching is shown by SWR is: 1:100
4.
Undesired oscillation devoted in RF amplifier circuit at some frequency higher than normal operating frequency. Parasitic
24. What is the ratio of un-modulated carrier power at 100% modulation? 25%
5.
UHF frequency falls within the band; 300 – 3000MHz
25. What is the operating frequency of the transceiver if the ratio wave is in 6 meters long? 50MHz
6.
If 10KHz tone transmitted and modulation index is 7.5, what is the value of maximum deviation? 75KHz
26. The frequency band most suitable for propagation using the Ionosphere is HF.
7.
To overcome language barrier. Q Codes
27. Ratio of the maximum deviation allowed to the modulating frequency is Frequency Deviation.
8.
The actual length of the radiating element in Marconi antenna is, One Quarter
9.
A device used for producing FM in transmitter. Reactance Modulator
10. Frequency bands mostly used for ground wave propagation. 300 – 3000 MHz
11. Any unwanted energy tending to interfere with the proper and easy reception of wanted signal, Noise
21. Emission in which the wave carrier is amplitude modulated, single side band vestigial side band, C. 22. Emission ion which carrier is amplitude modulated full carrier, A 23. The Root-Mean-Square value of sine wave from equal to: 70.7% of the peak value of the wave.
28. The most ideal SWR in VHF communication, Unity SWR or 1:1 SWR 29. Two forms of single modulation are frequency modulation and Phase Modulation. 30. F3 emission means carrier is frequency modulated by Voice. 31. To overcome the difficulty in spelling, the Phonetic Alphabet is used. 32. Which Diode normally reverse biased? Zener Diode
12. The use of Ionosphere in wave propagation utilizes mostly this kind of radio wave. Sky Wave
33. A circuit element that opposes changes in circuit, Inductor.
13. Microwave propagation make use of, Space Wave
34. Radiation occurring on frequencies which are whole multiple of the original desired frequency is called Harmonic.
14. The basic part of the transistor is, Base, Collector and Emitter 15. A circuit elements that opposes any change in voltage inductance communication involving distress should not exceeds 16 wpm 16. In radio teletype transmission other ACII or Baudot is used. 17. The power formula is P = EI. 18. What is the ratio of collector to base current of transistor? Beta
35. Undesired oscillation developed in ratio frequency amplifier circuit at some frequency is called, Parasitic. 36. Ideal value of signal-to-noise ratio, Infinity. 37. Frequency range between two half power points, Bandwidth. 38. How long is the antenna using a frequency which is the 2nd harmonic of the frequency of one meter antenna? 50 meter.
19. Emission of un-modulated carrier, N
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AMATEUR CLASS “B” REVIEWER 39. The sum of the carrier frequency of an amplitude modulated carrier signal: Upper Side Band 40. If you decrease the percentage of modulation from 100% to 50%, what percent have decrease the powering the side band? 25% 41. A frequency band most suitable for ground wave propagation, MF. 42. Balance modulator is device use to suppress the carrier in SSB transmitter. 43. What emission is one in which the main carrier frequency modulated by a single channel containing quantized information without the use of modulating sub carrier? F1 or F subscript 1. 44. Polarization of antenna used in high frequency propagation is normally, Horizontal. 45. Another name for indirect frequency modulation is Phase Modulation. 46. What is the ratio of un-modulated carrier power at 100% modulation? 25% 47. UHF frequency falls within the band 300 – 3000MHz. 48. Frequency modulation is of two forms of single modulation.
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AMATEUR CLASS “B” REVIEWER
Element 6
21. What is the capacitance reactance of the capacitor whose value is 300pF operating on frequency 1200 KHz? 379ohms
1.
A vacuum tube having a suppressor grid, Pentode.
2.
A carbon resistor with a color band yellow green and red has a value of, 4500 ohms.
3.
Two capacitors valued 400 and 600 uF consecutively are connected in series in an electrical circuit. What is the value of equivalent reactance? 240 uF
4.
The ratio of change of plate current and the grid voltage of a triodes amplifier having its plate resistance constant in the, Transconductance of the vacuum tube.
25. Diode normally used to low frequency high internal capacitance; Junction.
5.
Three identical inductors valued at 900 MH are connected in parallel the total equivalent inductance is equal to; 30MH
26. In semiconductor circuit in ratio or collector current to the base current is also known as; Beta
6.
A vacuum tube having a filament anode, cathode and control gate is, Triode.
27. The minority carrier n-type semiconductor material; Hole
7.
The symbol use to designate amplification factor of a VT amplifier; MU.
28. An electronic semiconductor components capable of controlling electron floe through it is known as; Solid state device.
8.
Commonly used diode as RF switch; PIN.
9.
The three terminal of the silicon control rectifier (SCR) are the anode, cathode and Gate.
22. A circuit consists of an inductance of 500uH and a capacitance of 400pF. What is the resonant frequency? 356KHz 23. The majority carrier in p-type semiconductor material; Hole 24. What is the majority carrier in n-type semiconductor material; Electron.
29. Dropping germanium with gallium causes; Hole current flow. 30. Solid state lamp is also known as; LED.
10. Type of diode normally used in voltage regulator circuit; Zener Diode.
31. An emitter flower transistor amplifier circuit is also known as; Common collector.
11. What is the forward resistance of an ideal diode? Zero.
32. A varactor is also known as; Variable capacitor diode
12. What diode has a negative resistance? Tunnel.
33. What is the photo junction device? Solid state device that increase its conductance which struck by proton of light and heat.
13. A vacuum tube having anode and cathode is; Diode. 14. Raleigh fading occurs several times per minute; Troposetter. 15. Two capacitor having a value of 40 and 60 uF are connected in series; 240uF. 16. Two inductors valued at 20 and 60 H respectively are connected in parallel. What is the total equivalent inductance? 15H
34. The very useful semiconductor is germanium and; Silicon. 35. The minority carrier in p-type semiconductor is; Electron. 36. Zener diodes are diode; Operate on its avalanche voltage. 37. The greatest advantage of the transistor over tube is; size of a vacuum.
17. The Beta of an a transistor is the; Current amplification factor 18. The sub-harmonic of 1000KHz; 500 KHz. 19. A conductive circuit pattern applied to an insulating substrate is known as; Printed circuit. 20. 3dB point is also known as; Half Power Point.
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AMATEUR CLASS “B” REVIEWER
Element 7
19. The best way to orient your antenna beam making a long distance communication is to use; Great circle map. 20. When you are leaving amateur station to transmit on working frequency, you may send a telegraphy, the letter; K.
1.
The readability signal tone reporting is base on a scale of; 0-5.
2.
The readability reporting for signal strength and tone is base on a scale; 0-9.
3.
What frequency band is mostly usable for the line of sight propagation; 30-300 MHz.
4.
Maximum power for CW transmission on HF station for class “B” license; 500 watts.
5.
For uniformity of international communication, the line measurement standard used vat present is; UTC.
6.
To facilitate the reception of distress call, all transmission on 145MHz shall be kept a minimum and shall not exceed; 1 minute.
25. A radio wave 10 meter long has a frequency equal to or approximately; 30MHz.
7.
Maximum power authorized for class “B” license operating in VHF; No specified limit.
26. Frequency modulated by voice is respected by the symbol; F3.
8.
What is the common code used in amateur radio telephony for atmospheric interference; QRM.
27. Property of receiver to discriminate against desire and undesired signal; Selectivity.
9.
What is the common code used in amateur radio telephony for message relay? QSP
10. What is the common code used in amateur radio telephony for who is this? QRZ
21. The calling frequency in the 40 meter band is; 7.45MHz. 22. SSB modulation is classified as; Amplitude. 23. A frequency band most useful for sky wave propagation is; HF. 24. Identical or matched impedance of transmission line of antenna will result in; Unity SWR.
28. A device use in SSB that suppress the carrier of an SSB transmitter; Balance modulator. 29. What is the length of the fourth harmonic of a 2 meter long radio signal? 0.50 meter. 30. The name of any station is; QRA.
11. What is the common code used in amateur radio telephony for signal strength varies? QSA
31. Who is calling me? QRZ
12. After a calling of certain station and does not answer, you are allowed to make; 3 calls.
32. I am troubled with static; QRN.
13. The single side demodulators is known as; Product detector
33. What is the common code used in amateur practice for conversation or talk; QSO.
14. For a repeater operation, it is good operating procedure to leave a; 3 seconds pause between over. 15. The voice equivalent for break in is; VOX. 16. The television standard used for color system in the Philippines; American standard committee. 17. What is the number of lines per frame of TV transmission in the Philippines; 525 lines per frame. 18. If it is 3 o’clock in the Philippines, what is UTC? 0700 UTC.
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