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Communication Systems

Communication Systems
Full duplex operation permits transmission in both directions at the same time.

True
False

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

Varactor diode modulator
Armstrong modulator
Reactance FET modulator
Reactance bipolar transistor

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

500 ohm
100 ohm
1000 ohm
300 ohm

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Communication Systems
The colour of an object is decided by

The wavelength transmitted through it
Reflected colour for opaque object and wavelength transmitted through it for transparent objects
None of these
The reflected colour

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Communication Systems
For AM receivers the standard IF frequency is

455 kHz
10.7 MHz
106 kHz
1.07 MHz

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

Linear devices
Class C amplifiers
Non-linear devices
Harmonic devices

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