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Amplitude Modulation and Demodulation
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Amplitude Modulation and Demodulation
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25 Questions

1. What is the reason of “envelope” in an amplitude modulated signal?
2. For high level modulation , amplifier used is
3. 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:
4. What is the effect of distortion?
5. What is the main function of a balanced modulator?
6. What is the cause of Overmodulation?
7. If 10mm is the accuracy considered, what will be the maximum value of λ for 1/1000 part?
8. What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?
9. What is the line connecting the positive and negative peaks of the carrier waveform called?
10. What is the circuit used for producing AM called?
11. Calculate the power saved in an Amplitude Modulated wave when it is transmitted with 45% modulation - Without carrier - Without carrier and a sideband
12. What is the reference line for the modulating signal?
13. At peak modulation an SSB transmitter radiate 1000W, what will it radiate with no modulation?
14. What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V?
15. Convex lens has negative focal power and concave lens have positive focal power.
16. What is the effect of distortion?
17. Calculate the frequencies available in the frequency spectrum when a 2MHz carrier is modulated by two sinusoidal signals of 350Hz and 600Hz.
18. Which of the following modulating signal voltage would cause over-modulation on a carrier voltage of 10v?
19. Which of the following represents the correct set of modulation classification?
20. 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.
21. Varacter diode modulator is an indirect way of generating FM.
22. What is the line connecting the positive and negative peaks of the carrier waveform called?
23. Calculation of modulation index using antenna current - AM transmitter has an antenna current changing from 5 A un modulated to 5.8 A. What is the percentage of modulation?
24. What is the change in the value of transmitted power when the modulation index changes from 0 to 1?
25. In amplitude modulation, which among the following is constant?

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