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Communication Systems

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

1000 ohm
500 ohm
100 ohm
300 ohm

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Communication Systems
If output power of a radio receiver is doubled, its volume is increased by __________ dB.

2
3
-3
1

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Communication Systems
A buffer amplifier is

A double-tuned amplifier
A cathode follower stage
None of these
A high gain D.C. amplifier

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Communication Systems
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

Better linearity
Improved efficiency
The lower modulating power requirement
High power output per transistor

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Communication Systems
If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

10
995
5
4.9

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Communication Systems
The frequency range of 300 kHz to 3000 kHz is known as

Medium frequency
Very high frequency
High frequency
Low frequency

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