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Amplitude Modulation MCQs
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Avg score: 25% • Most missed: “When AM signal is of 25KHz, calculate the number of channels required in Medium …”
Amplitude Modulation MCQs
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25 Questions

1. The advantages of using an RF amplifier are
2. Standard intermediate frequency used for AM receiver is
3. Generation of SSB SC signal is done by
4. Emitter modulator amplifier for Amplitude Modulation
5. Vestigial side band signals are detected by
6. An oscillator for an AM transmitter has a 100μH coil and a 10nF capacitor. If a modulating frequency of 10 KHz modulates the oscillator, find the frequency range of the side bands.
7. When AM signal is of 25KHz, calculate the number of channels required in Medium Frequency (MF) band of 300KHz-3000KHz.
8. 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
9. What is the maximum transmission efficiency of an AM signal?
10. Bandwidth required in SSB-SC signal is (fm is modulating frequency):
11. TRF receiver and super heterodyne receiver are used for
12. The functions of radio receiver are
13. Super heterodyne receivers
14. Pilot carrier is
15. Modulation is required for
16. What is the effect on the transmitted power of AM signal when the modulation index changes from 0.8 to 1?
17. Examples of low level modulation are
18. Requirements of synchronous detection of AM signal are:
19. Function of RF mixer is
20. For low level modulation, amplifier used is
21. Calculate the frequencies available in the frequency spectrum when a 2MHz carrier is modulated by two sinusoidal signals of 350Hz and 600Hz.
22. The function of multiplexing is
23. Demodulation is:
24. If modulation index is greater than 1
25. 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.

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