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Communication Systems

Communication Systems
Which one of the following is analog?

Differential PCM
PWM
Delta modulation
PCM

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Non-linear devices
Linear devices
Class C amplifiers
Harmonic devices

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Communication Systems
If sampling is done at the rate of 10 kHz. The bandwidth required is

70 kHz
1280 kHz
10 kHz
35 kHz

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Communication Systems
In Modulation, “carrier” is

Resultant wave
Voltage for which frequency, phase or amplitude is varied
Speech voltage to be transmitted
Voltage with constant frequency, phase or amplitude

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Communication Systems
The direction of rotation of a CD is

Clockwise or anticlockwise depending on frequency of data stored
Mostly anticlockwise but some times clockwise
Anticlockwise
Clockwise

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

2
3
-3
1

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