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Amplitude Modulation and Demodulation
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Amplitude Modulation and Demodulation
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25 Questions

1. Why AM stations has “low-fidelity”?
2. What is the reference line for the modulating signal?
3. The antenna current of the transmitter is 10A. Find the percentage of modulation when the antenna current increases to 10.4A.
4. Which of the following modulating signal voltage would cause over-modulation on a carrier voltage of 10v?
5. What is the equation for full-carrier AM?
6. What is the main function of a balanced modulator?
7. Calculate the total modulation Index when a carrier wave is being modulated by two modulating signals with modulation indices 0.8 and 0.3.
8. What is the condition for greatest output power at the transmitter without distortion?
9. Calculate the power saved in an Amplitude Modulated wave when it is transmitted with 45% modulation - Without carrier - Without carrier and a sideband
10. Which of the following represents the correct set of modulation classification?
11. What is the effect of distortion?
12. What is the purpose of peak clipper circuits in radios?
13. What is the circuit used for producing AM called?
14. What is the carrier frequency in an AM wave when its highest frequency component is 850Hz and the bandwidth of the signal is 50Hz?
15. Calculate the power saved in an Amplitude Modulated wave when it is transmitted with 45% modulation - Without carrier - Without carrier and a sideband
16. The modulation index can be derived from ________
17. Convex lens has negative focal power and concave lens have positive focal power.
18. What is the percentage of modulation if the modulating signal is of 7.5V and carrier is of 9V?
19. Calculate the frequencies available in the frequency spectrum when a 2MHz carrier is modulated by two sinusoidal signals of 350Hz and 600Hz.
20. At peak modulation an SSB transmitter radiate 1000W, what will it radiate with no modulation?
21. A single sideband modulation system is more efficient than a plain amplitude modulated system.
22. Which can’t be done in high frequency zones?
23. When does over-modulation occur?
24. In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.
25. What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?

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