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Modulation and Demodulation MCQs
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Modulation and Demodulation MCQs
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25 Questions

1. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
2. Modulation refers to a low-frequency signal controlling the ............
3. A high Q tuned circuit will permit an amplifier to have high ...............
4. Superhertodyne principle refers to
5. In a radio receiver, noise is generally developed at .............
6. As the modulation level is increased, the carrier power ..............
7. The signal voltage induced in the aerial of a radio receiver is of the order of ................
8. Most of the amplification in a superhetrodyne receiver occurs at .......... stage
9. A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?
10. If level of modulation is increased ................ power is increased
11. The superhetrodyne principle provides selectivity at .......... stage
12. In amplitude modulation, the ............ of carrier is varied according to the strength of the signal.
13. When the modulating signal controls the frequency of the carrier, we get..........
14. Modulation is done in ..............
15. Demodulation is done in ............
16. In TV transmission, sound signal is ..................... modulated
17. Overmodulation results in ..............
18. In the above question, what is the power in sidebands?
19. The function of ferrite antenna is to ................
20. In superhetrodyne receiver, the input at mixer stage is ..........
21. In a TRF radio receiver, the RF and detection stages are tuned to ............
22. In TV transmission, picture signal is .................. modulated
23. In an AM wave useful power is carrier by .............
24. In a radio receiver, we generally use .............. oscillator as a local oscillator
25. If modulation is 100% then signal amplitude is .............. carrier amplitude

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