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Communication Systems

Communication Systems
Which one of the following is analog?

PWM
Differential PCM
Delta modulation
PCM

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Communication Systems
Skip distance depends on time of day and angle of incidence.

True
False

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent tuned circuit damping
Prevent over modulation
Prevent excessive grid current
Increase the bandwidth

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Remains unchanged
Gets doubled
Gets halved
Gets increased by 50 percent

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Communication Systems
The disadvantage of FM over AM is that

High modulating power is needed
Noise is very high for high frequency
Large bandwidth is required
High output power is needed

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Communication Systems
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

4E
6E
3E
2E

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