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Communication Systems

Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

2
-3
3
1

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Communication Systems
Which of the following is a digital modulation technique?

DM
PSK
PCM
All

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Communication Systems
A buffer amplifier is

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

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Communication Systems
Which one of the following is analog?

Delta modulation
PWM
Differential PCM
PCM

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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

Statistically independent
Uncorrelated
Correlated
Orthogonal

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Communication Systems
Which of the following does not cause losses in optical fibre cables?

Attenuation in glass
Stepped index operation
Impurities
Microbending

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