Modulation and Demodulation Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “ Modulation and Demodulation ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Modulation and Demodulation comprehensively.

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Sciences MCQS

1.
In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because _________________?

The difference frequency is closer to oscillator frequency

Lower frequencies are easier to amplify

Only the difference frequency can be modulated

None of the above

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2.
In a TRF radio receiver, the RF and detection stages are tuned to______________?

Radio frequency

IF

Audio frequency

None of the above

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4.
In TV transmission, sound signal is ______________modulated?

Amplitude

Frequency

Phase

None of the above

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5.
The diode detector in an AM radio receiver is usually found _____________?

Before the first RF stage

After the first RF stage

After several stages of amplification

None of the above

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7.
Modulation refers to a low-frequency signal controlling the ________________?

Amplitude of the carrier

Frequency of the carrier

Phase of the carrier

May be any of the above

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8.
The major advantage of FM over AM is__________________?

Reception is less noisy

Higher carrier frequency

Smaller bandwidth

Small frequency deviation

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9.
Superhertodyne principle refers to_________________?

Using a large number of amplifier stages

Using a push-pull circuit

Obtaining lower fixed intermediate frequency

None of the above

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11.
Most of the amplification in a superhetrodyne receiver occurs at ______________stage?

IF

RF amplifier

Audio amplifier

Detector

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12.
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ________________?

Sensitivity

Selectivity

Distortion

Fidelity

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13.
The letters AVC stand for ________________?

Audio voltage control

Abrupt voltage control

Automatic volume control

Automatic voltage control

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14.
In superhetrodyne receiver, the input at mixer stage is________________?

IF and RF

RF and AF

IF and AF

RF and local oscillator signal

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15.
When the modulating signal controls the frequency of the carrier, we get______________?

Phase modulation

Amplitude modulation

Frequency modulation

May be any one of the above

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