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Communication Systems

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

0.5
1
0.8

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Communication Systems
The characteristic impedance of a twin wire feeder used for TV signals is about

100 ohm
300 ohm
1000 ohm
500 ohm

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

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

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

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

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

2
-3
1
3

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