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Communication Systems

Communication Systems
A modem is classified as low speed if data rate handled is

Upto 250 bps
Upto 600 bps
Upto 400 bps
Upto 100 bps

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Communication Systems
The direction of rotation of a CD is

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

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Communication Systems
The disadvantage of FM over AM is that

Noise is very high for high frequency
High modulating power is needed
Large bandwidth is required
High output power is needed

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Communication Systems
In TV systems, equalising pulses are sent during

Serrations
Horizontal blanking
Vertical blanking
Horizontal retrace

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Communication Systems
The main function of a balanced modulator is to

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

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Communication Systems
In a FM receiver, amplitude limiter

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

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MORE MCQ ON Communication Systems

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