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Communication Systems

Communication Systems
The frequency range of 300 kHz to 3000 kHz is known as

Low frequency
Medium frequency
High frequency
Very high frequency

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

Harmonic devices
Class C amplifiers
Linear devices
Non-linear devices

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

Stepped index operation
Impurities
Microbending
Attenuation in glass

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Communication Systems
If sampling is done at the rate of 10 kHz. The bandwidth required is

35 kHz
1280 kHz
10 kHz
70 kHz

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Communication Systems
When the length of antenna is a whole wavelength

The radiation at right angles is zero
The radiation is maximum in all directions
The radiation is zero in all directions
The radiation at right angles is maximum

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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.

5
4.9
995
10

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