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Communication Systems

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

-3
3
2
1

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Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and harmonics
A fundamental sine wave and even harmonics
A fundamental sine wave and odd harmonics
Fundamental and subharmonic sine waves

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

Class C amplifiers
Harmonic devices
Linear devices
Non-linear devices

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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.

80.9
102.3
113
70.2

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Communication Systems
PAM stands for

Pulse Amplitude Modulation
Phase Amplitude Modulation
Phase Analogue Modulation
Pulse Analogue Modulation

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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

8 kW
50 kW
20 kW
0.5 kW

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