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Communication Systems

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

-3
3
2
1

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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

2E
3E
6E
4E

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Communication Systems
For attenuation of high frequencies we should use

Series capacitance
Resistance
Shunt capacitance
Inductance

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Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 200
200 and 1.01
200 and 10.01
200 and 100.1

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Communication Systems
Which one of the following is analog?

PWM
Differential PCM
PCM
Delta modulation

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Communication Systems
As per Shannon-Hartley theorem, a noise less Gaussian channel has

None of these
Small capacity
Zero capacity
Infinite capacity

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