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Communication Systems

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
Which one of the following is analog?

Delta modulation
Differential PCM
PWM
PCM

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Communication Systems
If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

995
5
10
4.9

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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 100.1
200 and 200
200 and 10.01
200 and 1.01

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Communication Systems
When the length of antenna is a whole wavelength

The radiation is zero in all directions
The radiation at right angles is maximum
The radiation is maximum in all directions
The radiation at right angles is zero

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Communication Systems
FM transmitting and receiving equipment as compared to AM equipment is

Costly
None of these
Almost equally costly
Cheaper

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