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Communication Systems

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

1
-3
3
2

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Communication Systems
Skip distance depends on time of day and angle of incidence.

True
False

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Communication Systems
Which of the following is used to generate PDM?

Monostable multi-vibrator
Schmitt trigger
JK flip-flop
Free running multi-vibrator

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Communication Systems
For attenuation of high frequencies we should use

Resistance
Series capacitance
Shunt capacitance
Inductance

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Communication Systems
For a low level AM system, the amplifiers modulated stage must be

Non-linear devices
Class C amplifiers
Linear devices
Harmonic devices

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

0.8
1
0.5

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