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Communication Systems

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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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Neither A nor B
Either A or B
Half duplex arrangement
Duplex arrangement

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Communication Systems
FM transmitting and receiving equipment as compared to AM equipment is

None of these
Costly
Almost equally costly
Cheaper

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Communication Systems
Which of the following is used to generate PDM?

Free running multi-vibrator
Schmitt trigger
Monostable multi-vibrator
JK flip-flop

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

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

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Communication Systems
The direction of rotation of a CD is

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

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