Communication Systems - ECE Questions and Answers

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SSB can be generated by

filter method

phase cancellation method

good attenuation characteristics

all of the above

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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

statistically independent

uncorrelated

orthogonal

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What is the purpose of peak clipper circuits in radio transmitters?

To prevent overmodulation

To reduce bandwidth

To increase bandwidth

To regulate oscillator I/P voltage

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

class C amplifiers

linear devices

non-linear devices

harmonic devices

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Under ordinary circumstances, impulse noise can be reduced in

FM only

AM only

both AM and FM

none of the above

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In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

amplitude of distant sidebands decreases

amplitude of distant sidebands increases

amplitude of distant sidebands remains constant

amplitude of distant sidebands first increases, then decreases

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

35 kHz

70 kHz

10 kHz

1280 kHz

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It is found that a ship to ship communication suffers from fading. This can be avoided by using

space diversity

frequency diversity

broad band antenna

directional antenna

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

True

False