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Communication Systems

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

False
True

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

Linear devices
Harmonic devices
Non-linear devices
Class C amplifiers

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Gets halved
Gets doubled
Remains unchanged
Gets increased by 50 percent

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Communication Systems
To eliminate ghosts in the picture

Use a longer transmission line
Twist the transmission line
Connect a booster
Change the antenna orientation of location

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Communication Systems
In a TV receiver antenna the length of reflector rod

May be equal, more or less than that of dipole
Is the same as that of dipole
Is more than that of dipole
Is less than that of dipole

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Communication Systems
In practical commercial FM system, channel bandwidth is

150 kHz
108 MHz
88 MHz
100 kHz

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