Modulation And Demodulation MCQ Questions & Answers

1

In a superhetrodyne receiver, the difference frequency is chosen as the IF rather than the sum frequency because ___________

A) The difference frequency is closer to oscillator frequency B) Lower frequencies are easier to amplify C) Only the difference frequency can be modulated D) None of the above

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Answer & Solution

Answer: Option B

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2

Modulation is done in ___________

A) Transmitter B) Radio receiver C) Between transmitter and radio receiver D) None of the above

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Answer & Solution

Answer: Option A

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3

Demodulation is done in ___________

A) Receiving antenna B) Transmitter C) Radio receiver D) Transmitting antenna

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Answer & Solution

Answer: Option C

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4

In the above question, what is the power in sidebands?

A) 8 kW B) 6 kW C) 06 kW D) 9 kW

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Answer & Solution

Answer: Option C

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5

Superhertodyne principle refers to

A) Using a large number of amplifier stages B) Using a push-pull circuit C) Obtaining lower fixed intermediate frequency D) None of the above

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Answer & Solution

Answer: Option C

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6

At 100% modulation, the power in each sideband is ___________ of that of carrier

A) 50% B) 40% C) 60% D) 25%

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Answer & Solution

Answer: Option D

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7

In a transmitter ___________ oscillator is used

A) Hartley B) RC phase-shift C) Wien-bridge D) Crystal

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Answer & Solution

Answer: Option D

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8

If level of modulation is increased ___________ power is increased

A) Carrier B) Sideband C) Carrier as well as sideband D) None of the above

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Answer & Solution

Answer: Option B

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9

Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude

A) Equal to B) Greater than C) Less than D) None of the above

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Answer & Solution

Answer: Option B

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10

If modulation is 100% then signal amplitude is ___________ carrier amplitude

A) Equal to B) Greater than C) Less than D) None of the above

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Answer & Solution

Answer: Option A

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Modulation And Demodulation MCQ Questions & Answers | Electrical Engineering