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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
FM transmitting and receiving equipment as compared to AM equipment is

Almost equally costly
None of these
Cheaper
Costly

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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

3E
4E
2E
6E

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Communication Systems
The disadvantage of FM over AM is that

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

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Communication Systems
For attenuation of high frequencies we should use

Inductance
Series capacitance
Resistance
Shunt capacitance

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Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

-3
2
1
3

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