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Communication Systems

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

-3
2
1
3

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

Impurities
Stepped index operation
Microbending
Attenuation in glass

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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
1
16
15

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Prevent excessive grid current
Increase the bandwidth
Prevent tuned circuit damping
Prevent over modulation

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Communication Systems
If sampling is done at the rate of 10 kHz. The bandwidth required is

70 kHz
10 kHz
1280 kHz
35 kHz

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Remains unchanged
Gets increased by 50 percent
Gets halved
Gets doubled

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