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Communication Systems

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

300 ohm
100 ohm
500 ohm
1000 ohm

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Communication Systems
A buffer amplifier is

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

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Communication Systems
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are

200 and 10.01
200 and 200
200 and 100.1
200 and 1.01

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Communication Systems
To eliminate ghosts in the picture

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

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Communication Systems
A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is

1
8
16
15

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

Class C amplifiers
Linear devices
Harmonic devices
Non-linear devices

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