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Communication Systems

Communication Systems
Which one of the following is analog?

PCM
PWM
Delta modulation
Differential PCM

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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 200
200 and 1.01
200 and 10.01
200 and 100.1

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

All
PCM
PSK
DM

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

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

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Communication Systems
The disadvantage of FM over AM is that

High output power is needed
Large bandwidth is required
Noise is very high for high frequency
High modulating power is needed

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Communication Systems
In a TV receiver antenna the length of reflector rod

Is the same as that of dipole
May be equal, more or less than that of dipole
Is more than that of dipole
Is less than that of dipole

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