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Communication Systems

Communication Systems
A buffer amplifier is

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

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Communication Systems
As per Shannon-Hartley theorem, a noise less Gaussian channel has

None of these
Small capacity
Zero capacity
Infinite capacity

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Communication Systems
Which of the following is an indirect way of generating FM?

Reactance FET modulator
Armstrong modulator
Reactance bipolar transistor
Varactor diode modulator

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

100 ohm
500 ohm
1000 ohm
300 ohm

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Communication Systems
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?

Gets halved
Gets increased by 50 percent
Gets doubled
Remains unchanged

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Communication Systems
A woofer should be fed from the input through a

Low pass filter
High pass filter
Band stop filter
Band pass filter

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