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Communication Systems

Communication Systems
Which one of the following is analog?

PCM
Delta modulation
Differential PCM
PWM

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Communication Systems
PAM stands for

Phase Analogue Modulation
Phase Amplitude Modulation
Pulse Analogue Modulation
Pulse Amplitude Modulation

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

Armstrong modulator
Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor

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

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

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent over modulation
Prevent excessive grid current
Prevent tuned circuit damping
Increase the bandwidth

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Harmonic devices
Class C amplifiers
Linear devices
Non-linear devices

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