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Communication Systems

Communication Systems
A modem is classified as low speed if data rate handled is

Upto 600 bps
Upto 400 bps
Upto 100 bps
Upto 250 bps

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Communication Systems
In EM waves, polarization

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

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

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

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

Microbending
Stepped index operation
Attenuation in glass
Impurities

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Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

3
1
-3
2

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Communication Systems
A buffer amplifier is

A cathode follower stage
A double-tuned amplifier
None of these
A high gain D.C. amplifier

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