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Communication Systems

Communication Systems
A buffer amplifier is

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

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Communication Systems
The direction of rotation of a CD is

Mostly anticlockwise but some times clockwise
Anticlockwise
Clockwise or anticlockwise depending on frequency of data stored
Clockwise

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Communication Systems
A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

Uncorrelated
Orthogonal
Correlated
Statistically independent

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Communication Systems
In practical commercial FM system, channel bandwidth is

108 MHz
100 kHz
150 kHz
88 MHz

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

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

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Communication Systems
VSB modulation is preferred in TV because

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

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