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Communication Systems

Communication Systems
In TV systems, equalising pulses are sent during

Horizontal retrace
Horizontal blanking
Serrations
Vertical blanking

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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

Statistically independent
Correlated
Orthogonal
Uncorrelated

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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Half duplex arrangement
Either A or B
Duplex arrangement
Neither A nor B

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

Directional antenna
Frequency diversity
Space diversity
Broad band antenna

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Communication Systems
In EM waves, polarization

Results from longitudinal nature of waves
Is caused by reflection
Is always vertical in an isotropic medium
Is due to transverse nature of waves

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

Stepped index operation
Attenuation in glass
Microbending
Impurities

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