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Amplitude Modulation MCQs
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Amplitude Modulation MCQs
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1. AM demodulation techniques are
2. If an AM signal is represented by v = ( 15 + 3 Sin( 2Π * 5 * 103 t) ) * Sin( 2Π * 0.5 * 106 t) volts i) Calculate the values of the frequencies of carrier and modulating signals. ii) Calculate the value of modulation index. iii) Calculate the value of bandwidth of this signal.
3. Function of RF mixer is
4. A 3 GHz carrier is DSB SC modulated by a signal with maximum frequency of 2 MHz. The minimum sampling frequency required for the signal so that the signal is ideally sampled is
5. Pilot carrier is
6. In High level Amplitude Modulation
7. Cross talk is –
8. 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.
9. 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:
10. Phase shift method is
11. The antenna current of the transmitter is 10A. Find the percentage of modulation when the antenna current increases to 10.4A.
12. Intermediate frequency (IF) should be carefully chosen as
13. Ring modulator is
14. For over modulation, the value of modulation index m is
15. Squelch circuit is
16. Aliasing refers to
17. Examples of low level modulation are
18. Function of frequency mixer in super heterodyne receiver is
19. If modulation index is greater than 1
20. Calculate the frequencies available in the frequency spectrum when a 2MHz carrier is modulated by two sinusoidal signals of 350Hz and 600Hz.
21. The total power in an Amplitude Modulated signal if the carrier of an AM transmitter is 800 W and it is modulated 50 percent.
22. The modulation technique that uses the minimum channel bandwidth and transmitted power is
23. Advantages of using an RF amplifier are:
24. Bandwidth required in SSB-SC signal is (fm is modulating frequency):
25. The factors that determine the sensitivity of super heterodyne receiver are

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