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Communication Systems

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

True
False

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Communication Systems
If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

995
4.9
5
10

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

Impurities
Stepped index operation
Attenuation in glass
Microbending

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Communication Systems
In a FM receiver, amplitude limiter

Amplifiers low frequency signals
Eliminates any change in amplitude of received FM signals
Reduces the amplitude of signals
None of these

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Communication Systems
In Modulation, “carrier” is

Speech voltage to be transmitted
Resultant wave
Voltage for which frequency, phase or amplitude is varied
Voltage with constant frequency, phase or amplitude

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