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Communication Systems

Communication Systems
Which one of the following is analog?

Delta modulation
PWM
Differential PCM
PCM

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Communication Systems
In TV systems, equalising pulses are sent during

Horizontal blanking
Serrations
Vertical blanking
Horizontal retrace

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Communication Systems
Which of the following is used to generate PDM?

Monostable multi-vibrator
Free running multi-vibrator
Schmitt trigger
JK flip-flop

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

Impurities
Microbending
Attenuation in glass
Stepped index operation

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

Small capacity
None of these
Zero capacity
Infinite capacity

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Communication Systems
In a TV receiver antenna the length of reflector rod

May be equal, more or less than that of dipole
Is less than that of dipole
Is more than that of dipole
Is the same as that of dipole

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