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Electronics Mechanic Practice Test: Modulation And Detection
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Electronics Mechanic Practice Test: Modulation And Detection
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25 Questions

1. A centre tapped secondary type transformer is necessary for —
2. Receivers require _____ diode for the detection of AM waves —
3. FM signals are generally propagated by —
4. In FM system, the modulation index is equal to 1 (100%) for a frequency deviation of
5. What is the effect of increasing the modulation depth to 100% in Amplitude modulation process?
6. Which amplifier is first matches the output impedance of the carrier oscillator with the input impedance?
7. What is the effect on the AM transmitter output if the modulation index value exceeds unity?
8. One major disadvantage of AM is _______
9. AM is used in _______
10. It is necessary for the detection of FM signals to use a —
11. FM is popular because —
12. Which one of the following is not a limitation of AM?
13. AFC is a stage of FM receiver which —
14. Delayed A.V.C. circuit requires at least_______
15. How the image frequency is prevented in radio receiver circuits?
16. Which type of antenna is used for point-to-point communication of radio waves?
17. In pulse code modulation, the carrier pulses are—
18. Why the modulation index is kept within limits in amplitude modulated signal transmission?
19. In FM, the amplitude of modulating signal (A.F) varies the —
20. FM broadcasting is done in the frequency band of —
21. A simple AM detector circuit requires at least one diode and a … filter circuit_______
22. For an unmodulated RF signal, the output of a FM detector will be —
23. The bandwidth of AM broadcasting channel is equal to _________
24. The percent of modulation is 100 if the amplitudes of signal and carrier waves are ___
25. How the over modulation of carrier signal is prevented by the broadcast station?

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