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Communication Systems

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

Harmonic devices
Linear devices
Class C amplifiers
Non-linear devices

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Communication Systems
In a TV receiver antenna the length of reflector rod

Is the same as that of dipole
May be equal, more or less than that of dipole
Is less than that of dipole
Is more than that of dipole

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Communication Systems
Which of the following is used to generate PDM?

Free running multi-vibrator
JK flip-flop
Monostable multi-vibrator
Schmitt trigger

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Communication Systems
In Modulation, “carrier” is

Voltage with constant frequency, phase or amplitude
Speech voltage to be transmitted
Voltage for which frequency, phase or amplitude is varied
Resultant wave

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Communication Systems
For telegraphy the most commonly used modulation system is

FSK
PCM
Single tone modulation
Two tone modulation

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Communication Systems
A telephone channel requires a bandwidth of about

3 kHz
10 kHz
50 kHz
1 kHz

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