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Communication Systems

Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

20 kW
0.5 kW
50 kW
8 kW

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Communication Systems
Which of the following does not cause losses in optical fibre cables?

Stepped index operation
Microbending
Attenuation in glass
Impurities

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Communication Systems
A telephone channel requires a bandwidth of about

50 kHz
3 kHz
1 kHz
10 kHz

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Communication Systems
A buffer amplifier is

A cathode follower stage
A high gain D.C. amplifier
A double-tuned amplifier
None of these

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Communication Systems
The direction of rotation of a CD is

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

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Communication Systems
What is the purpose of peak clipper circuits in radio transmitters?

To prevent overmodulation
To regulate oscillator I/P voltage
To reduce bandwidth
To increase bandwidth

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