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Communication Systems

Communication Systems
A buffer amplifier is

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

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Communication Systems
VSB modulation is preferred in TV because

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

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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
Fourier analysis indicate that a square wave can be represented as

Fundamental and subharmonic sine waves
A fundamental sine wave and harmonics
A fundamental sine wave and odd harmonics
A fundamental sine wave and even harmonics

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Communication Systems
For attenuation of high frequencies we should use

Inductance
Resistance
Series capacitance
Shunt capacitance

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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 reduce bandwidth
To prevent overmodulation

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