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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
6E
3E

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Communication Systems
If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

4.9
995
5
10

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

False
True

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Communication Systems
For AM receivers the standard IF frequency is

10.7 MHz
106 kHz
1.07 MHz
455 kHz

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Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Non-linear devices
Harmonic devices
Linear devices
Class C amplifiers

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Communication Systems
A telephone channel requires a bandwidth of about

10 kHz
1 kHz
50 kHz
3 kHz

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