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Communication Systems

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

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

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Communication Systems
A telephone channel requires a bandwidth of about

50 kHz
1 kHz
10 kHz
3 kHz

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Communication Systems
When the length of antenna is a whole wavelength

The radiation at right angles is zero
The radiation at right angles is maximum
The radiation is zero in all directions
The radiation is maximum in all directions

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Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Increase the bandwidth
Prevent tuned circuit damping
Prevent over modulation
Prevent excessive grid current

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

Varactor diode modulator
Reactance bipolar transistor
Armstrong modulator
Reactance FET modulator

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Communication Systems
The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

50 kW
0.5 kW
20 kW
8 kW

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