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Principle of Communication Engineering: Amplitude Modulation and Demodulation
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Principle of Communication Engineering: Amplitude Modulation and Demodulation
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25 Questions

1. What is the effect of distortion?
2. What is the equation for full-carrier AM?
3. When does over-modulation occur?
4. What is the condition for greatest output power at the transmitter without distortion?
5. All lens have positive focal power.
6. What is the reference line for the modulating signal?
7. Balanced modulator is used to suppress carrier signal to create an SSB or DSB.
8. What is the cause of Overmodulation?
9. Modulating wave can also be known as ______
10. In Amplitude Modulation, the instantaneous values of the carrier amplitude changes in accordance with the amplitude and frequency variations of the modulating signal.
11. The ratio between the modulating signal voltage and the carrier voltage is called?
12. Frequency modulation is equipped in all EDM instruments.
13. What is the change in the value of transmitted power when the modulation index changes from 0 to 1?
14. What is the circuit used for producing AM called?
15. What is the condition for greatest output power at the transmitter without distortion?
16. 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.
17. 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?
18. At peak modulation an SSB transmitter radiate 1000W, what will it radiate with no modulation?
19. What is the circuit used for producing AM called?
20. For classifying a modem as low speed its data rate is ________
21. Lower frequency is not suitable in_________
22. Which of the following is an indirect way of generating FM?
23. What is the main function of a balanced modulator?
24. For high level modulation , amplifier used is
25. What happens when the amplitude of the modulating signal is greater than the amplitude of the carrier?

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