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Communication Systems

Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

0.5 kW
20 kW
50 kW
8 kW

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Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Linear devices
Harmonic devices
Non-linear devices
Class C amplifiers

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Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and even harmonics
Fundamental and subharmonic sine waves
A fundamental sine wave and harmonics
A fundamental sine wave and odd harmonics

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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 frequency range of 300 kHz to 3000 kHz is known as

High frequency
Medium frequency
Very high frequency
Low frequency

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Communication Systems
Which of the following does not cause losses in optical fibre cables?

Impurities
Attenuation in glass
Stepped index operation
Microbending

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