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Communication Systems

Communication Systems
Full duplex operation permits transmission in both directions at the same time.

True
False

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

Varactor diode modulator
Reactance FET modulator
Reactance bipolar transistor
Armstrong modulator

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

Impurities
Attenuation in glass
Stepped index operation
Microbending

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Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

0.5 kW
50 kW
20 kW
8 kW

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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

15
1
8
16

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Communication Systems
An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

113
102.3
70.2
80.9

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