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Communication Systems

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

Harmonic devices
Linear devices
Class C amplifiers
Non-linear devices

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Communication Systems
Which of the following is an indirect way of generating FM?

Reactance FET modulator
Reactance bipolar transistor
Varactor diode modulator
Armstrong modulator

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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
In a FM receiver, amplitude limiter

Eliminates any change in amplitude of received FM signals
Amplifiers low frequency signals
None of these
Reduces the amplitude of signals

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Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Duplex arrangement
Either A or B
Half duplex arrangement
Neither A nor B

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Communication Systems
Commercial Frequency deviation of FM is

70 kHz
75 kHz
65 kHz
80 kHz

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