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Communication Systems

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

100 ohm
1000 ohm
300 ohm
500 ohm

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

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

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Communication Systems
The direction of rotation of a CD is

Anticlockwise
Mostly anticlockwise but some times clockwise
Clockwise or anticlockwise depending on frequency of data stored
Clockwise

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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.

70.2
113
80.9
102.3

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Communication Systems
To eliminate ghosts in the picture

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

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Communication Systems
Under ordinary circumstances, impulse noise can be reduced in

AM only
None of these
FM only
Both AM and FM

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