Frequency Modulation
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Frequency Modulation
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25 Questions

1. Disadvantages of FM over AM are
2. The modulation index of FM is given by
3. In frequency modulation,
4. The modulation index of a wideband FM system is _____.
5. Guard bands are provided in FM signal to
6. Change in instantaneous phase of the carrier with change in amplitude of the modulating signal generates
7. The increase or decrease in the frequency around the carrier frequency is termed as
8. Frequency deviation in FM is
9. Advantage of using direct method for generation of FM signal is
10. According to Carson’s rule, Bandwidth B and modulating frequency fm are related as
11. The transmitted power in an FM system is ______.
12. Carrier swing is defined as
13. Pre emphasis is done before
14. Phase-locked loop can be used as
15. A 100MHz carrier is frequency modulated by 5 KHz wave. For a frequency deviation of 100 KHz, calculate the carrier swing of the FM signal.
16. Drawbacks of Tuned Radio Receiver are
17. FM signal is better than AM signal because
18. To obtain the same S/N ratio at the same distance from the transmitter, FM transmitter has to transmit ______ power as compared to AM .
19. The equation of the FM signal is  10 sin [2 π ×  106 t +5 sin ( 2 π × 103 t )]. The modulating frequency is  _____.
20. Maximum frequency deviation and the maximum bandwidth allowed for commercial FM broadcast is
21. For a FM signal v(t) = 20 cos ( 10 * 108t + 30 sin 3000t), calculate the power dissipated by the FM wave in a 20Ω resistor.
22. Determine the Bandwidth of a FM wave when the maximum deviation allowed is 75KHz and the modulating signal has a frequency of 10KHz.
23. What is the maximum frequency deviation allowed in commercial FM broadcasting?
24. A 100MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the modulation index of the FM signal.
25. FM is advantageous over AM as

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