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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

8 kW
20 kW
0.5 kW
50 kW

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Communication Systems
Skip distance depends on time of day and angle of incidence.

False
True

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

0.5
1
0.8

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Communication Systems
In EM waves, polarization

Is caused by reflection
Results from longitudinal nature of waves
Is due to transverse nature of waves
Is always vertical in an isotropic medium

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Communication Systems
In a TV receiver antenna the length of reflector rod

May be equal, more or less than that of dipole
Is more than that of dipole
Is less than that of dipole
Is the same as that of dipole

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

Non-linear devices
Linear devices
Class C amplifiers
Harmonic devices

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