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Communication Systems

Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

1000 ohm
500 ohm
100 ohm
300 ohm

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Communication Systems
Under ordinary circumstances, impulse noise can be reduced in

Both AM and FM
None of these
AM only
FM only

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Communication Systems
A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

Correlated
Uncorrelated
Orthogonal
Statistically independent

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Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 200
200 and 100.1
200 and 1.01
200 and 10.01

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Communication Systems
FM transmitting and receiving equipment as compared to AM equipment is

Almost equally costly
None of these
Cheaper
Costly

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Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and even harmonics
Fundamental and subharmonic sine waves
A fundamental sine wave and odd harmonics
A fundamental sine wave and harmonics

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