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Communication Systems

Communication Systems
In TV systems, equalising pulses are sent during

Horizontal blanking
Horizontal retrace
Vertical blanking
Serrations

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

Attenuation in glass
Microbending
Stepped index operation
Impurities

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

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

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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

20 kW
8 kW
50 kW
0.5 kW

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

High power output per transistor
Improved efficiency
Better linearity
The lower modulating power requirement

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Communication Systems
For telegraphy the most commonly used modulation system is

Single tone modulation
FSK
PCM
Two tone modulation

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