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Communication Systems

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

All
PSK
DM
PCM

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Communication Systems
The direction of rotation of a CD is

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

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

8 kW
50 kW
20 kW
0.5 kW

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Communication Systems
Skip distance depends on time of day and angle of incidence.

False
True

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Communication Systems
Commercial Frequency deviation of FM is

65 kHz
70 kHz
80 kHz
75 kHz

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

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

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