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Communication Systems

Communication Systems
Which one of the following is analog?

Differential PCM
Delta modulation
PCM
PWM

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Communication Systems
A buffer amplifier is

A double-tuned amplifier
A high gain D.C. amplifier
A cathode follower stage
None of these

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Communication Systems
The main function of a balanced modulator is to

Produce 100% modulation
Limit noise picked by a receiver
Suppress carrier signal in order to create a single-sideband or double sideband
Produce balanced modulation of a carrier wave

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Communication Systems
PAM stands for

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

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Communication Systems
VSB modulation is preferred in TV because

It avoids phase distortion at low frequencies
It results in better reception
It reduces the bandwidth requirement to half
None of these

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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
Increase the bandwidth
Prevent tuned circuit damping

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