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Communication Systems

Communication Systems
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.5
1
0.8

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Communication Systems
A telephone channel requires a bandwidth of about

1 kHz
50 kHz
10 kHz
3 kHz

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Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 10.01
200 and 100.1
200 and 200
200 and 1.01

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

All
PCM
DM
PSK

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Communication Systems
PAM stands for

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

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Communication Systems
The direction of rotation of a CD is

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

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