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Amplitude Modulation MCQs
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Amplitude Modulation MCQs
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1. Calculate the depth of modulation when a transmitter radiates a signal of 9.8KW after modulation and 8KW without modulation of the signal.
2. Frequency components of an AM wave (m = modulation index) are
3. Calculate the power in a DSB SC signal when the modulation is 60% with a carrier power of 600W.
4. An unmodulated AM signal produces a current of 5.4 A. If the modulation is 100 percent, calculate: (a) the carrier power, (b) the total power, (c) the sideband power when it is transmitted through an antenna having an impedance of 50Ω.
5. Analog communication indicates:
6. Radio waves travel through
7. Calculate the power in one of the side band in SSBSC modulation when the carrier power is 124W and there is 80% modulation depth in the amplitude modulated signal.
8. AM demodulation techniques are
9. Intermediate frequency (IF) should be carefully chosen as
10. Calculate the modulation index when the un modulated carrier power is 15KW, and after modulation, carrier power is 17KW.
11. Aliasing refers to
12. The AM spectrum consists of
13. Synchronous detection means
14. An AM transmitter has an antenna current changing from 5 A un modulated to 5.8 A. What is the percentage of modulation?
15. The antenna current of the transmitter is 10A. Find the percentage of modulation when the antenna current increases to 10.4A.
16. Amplitude modulation is
17. Calculate the bandwidth occupied by a DSB signal when the modulating frequency lies in the range from 100 Hz to 10KHz.
18. Demodulation is:
19. What is the maximum transmission efficiency of an AM signal?
20. Quadrature Amplitude Modulation (QAM) is
21. An AM broadcast station transmits modulating frequencies up to 6 kHz. If the AM station is transmitting on a frequency of 894 kHz, the values for maximum and minimum upper and lower sidebands and the total bandwidth occupied by the AM station are:
22. Vestigial side band signals are detected by
23. Pilot carrier is
24. When AM signal is of 25KHz, calculate the number of channels required in Medium Frequency (MF) band of 300KHz-3000KHz.
25. In Low level Amplitude Modulation

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