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Communication Systems

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

1000 ohm
100 ohm
300 ohm
500 ohm

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Communication Systems
In EM waves, polarization

Is always vertical in an isotropic medium
Results from longitudinal nature of waves
Is caused by reflection
Is due to transverse nature of waves

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Communication Systems
Which of the following does not cause losses in optical fibre cables?

Impurities
Stepped index operation
Attenuation in glass
Microbending

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

Harmonic devices
Linear devices
Non-linear devices
Class C amplifiers

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

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

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Communication Systems
A telephone channel requires a bandwidth of about

1 kHz
3 kHz
10 kHz
50 kHz

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