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Communication Systems

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

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

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Communication Systems
What is the purpose of peak clipper circuits in radio transmitters?

To increase bandwidth
To prevent overmodulation
To regulate oscillator I/P voltage
To reduce bandwidth

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Communication Systems
For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

0.8
1
0.5

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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

15
8
1
16

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Communication Systems
VSB modulation is preferred in TV because

It results in better reception
None of these
It avoids phase distortion at low frequencies
It reduces the bandwidth requirement to half

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

100 ohm
300 ohm
500 ohm
1000 ohm

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