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Communication Systems

Communication Systems
Which of the following is a digital modulation technique?

DM
PSK
PCM
All

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Communication Systems
SSB can be generated by

Phase cancellation method
Filter method
Good attenuation characteristics
All of these

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

1000 ohm
100 ohm
300 ohm
500 ohm

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

3
-3
1
2

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Communication Systems
The direction of rotation of a CD is

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

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Communication Systems
In TV systems, equalising pulses are sent during

Horizontal retrace
Serrations
Horizontal blanking
Vertical blanking

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