Communication Systems - ECE Questions and Answers

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FM has

two sidebands only

four sidebands only

eight sidebands only

infinite sidebands

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The service area of a TV transmitter is a little beyond radio horizon.

True

False

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If carrier power is P and amplitude modulation index is m, the total power after modulation is

P(1 + m)

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Bit is a unit of

entropy

information

channel capacity

rate of information

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The modulation index of an AM wave is changed from 0 to 1. The transmitted power is

unchanged

halved

increased by 50%

quadrupled

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In a radio receiver the input from local oscillator is fed to

RF amplifier

mixer

IF amplifier

detector

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A shadow zone does not receive any space wave

True

False

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A radio frequency signal contains the following three frequencies :
850 kHz; 865 kHz and 875 kHz
In order to amplify this signal, which of the following amplifier should be selected?

Push pull amplifier

Wideband amplifier

Audio frequency amplifier

Tuned voltage amplifier

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Which of the following pulse-time modulation is least used?

PDM

PPM

PWM

PAM