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Communication Systems

Communication Systems
Under ordinary circumstances, impulse noise can be reduced in

None of these
Both AM and FM
AM only
FM only

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Communication Systems
For attenuation of high frequencies we should use

Series capacitance
Resistance
Shunt capacitance
Inductance

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Communication Systems
What is the purpose of peak clipper circuits in radio transmitters?

To increase bandwidth
To regulate oscillator I/P voltage
To reduce bandwidth
To prevent overmodulation

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Communication Systems
The disadvantage of FM over AM is that

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

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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
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

15
8
1
16

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