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Communication Systems

Communication Systems
Which one of the following is analog?

PWM
PCM
Delta modulation
Differential PCM

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Communication Systems
Which of the following is an indirect way of generating FM?

Reactance FET modulator
Reactance bipolar transistor
Varactor diode modulator
Armstrong modulator

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Communication Systems
A woofer should be fed from the input through a

Band stop filter
Band pass filter
High pass filter
Low pass filter

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Communication Systems
In TV systems, equalising pulses are sent during

Serrations
Vertical blanking
Horizontal blanking
Horizontal retrace

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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

50 kW
0.5 kW
8 kW
20 kW

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

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

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