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Communication Systems

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

0.8
0.5
1

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Communication Systems
The disadvantage of FM over AM is that

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

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Communication Systems
As per Shannon-Hartley theorem, a noise less Gaussian channel has

Zero capacity
Small capacity
None of these
Infinite capacity

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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
A telephone channel requires a bandwidth of about

1 kHz
50 kHz
3 kHz
10 kHz

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Communication Systems
In TV systems, equalising pulses are sent during

Vertical blanking
Horizontal blanking
Horizontal retrace
Serrations

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