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Communication Systems

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
Which one of the following is analog?

Delta modulation
PWM
Differential PCM
PCM

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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
102.3
80.9
113

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Communication Systems
Which of the following is used to generate PDM?

Monostable multi-vibrator
Schmitt trigger
Free running multi-vibrator
JK flip-flop

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

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

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Communication Systems
It is found that a ship to ship communication suffers from fading. This can be avoided by using

Directional antenna
Frequency diversity
Space diversity
Broad band antenna

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