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Communication Systems

Communication Systems
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

102.3
113
80.9
70.2

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

0.5
0.8
1

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Communication Systems
The main function of a balanced modulator is to

Produce 100% modulation
Suppress carrier signal in order to create a single-sideband or double sideband
Limit noise picked by a receiver
Produce balanced modulation of a carrier wave

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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 1.01
200 and 100.1
200 and 200
200 and 10.01

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Communication Systems
Which one of the following is analog?

PCM
Delta modulation
PWM
Differential PCM

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Harmonic devices
Non-linear devices
Linear devices
Class C amplifiers

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