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Communication Systems

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

4E
2E
3E
6E

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

1
2
3
-3

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

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

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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
The disadvantage of FM over AM is that

Noise is very high for high frequency
High modulating power is needed
Large bandwidth is required
High output power is needed

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

True
False

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