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Communication Systems

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

None of these
Small capacity
Infinite capacity
Zero capacity

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

8
15
1
16

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Communication Systems
In EM waves, polarization

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

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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

3E
2E
6E
4E

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

Stepped index operation
Impurities
Attenuation in glass
Microbending

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Communication Systems
Which of the following is an indirect way of generating FM?

Reactance bipolar transistor
Armstrong modulator
Reactance FET modulator
Varactor diode modulator

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