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Communication Systems

Communication Systems
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.8
0.5
1

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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
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as

2E
3E
6E
4E

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Communication Systems
The main function of a balanced modulator is to

Produce balanced modulation of a carrier wave
Limit noise picked by a receiver
Produce 100% modulation
Suppress carrier signal in order to create a single-sideband or double sideband

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Communication Systems
SSB can be generated by

Filter method
Good attenuation characteristics
All of these
Phase cancellation method

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Communication Systems
In EM waves, polarization

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

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