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Communication Systems

Communication Systems
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

4E
2E
6E
3E

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Communication Systems
The main function of a balanced modulator is to

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

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Communication Systems
It is found that a ship to ship communication suffers from fading. This can be avoided by using

Space diversity
Frequency diversity
Broad band antenna
Directional antenna

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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
The direction of rotation of a CD is

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

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Communication Systems
In TV systems, equalising pulses are sent during

Horizontal blanking
Serrations
Vertical blanking
Horizontal retrace

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