Modulation MCQ - MCQTrip

Test your knowledge of modulation with our online MCQs. Get instant feedback and track your progress as you work through the questions. . Challenge yourself to get the highest score. Twenty (20) MCQ questions from our test bank will be randomly shown for every attempt. Passing mark for this test is 70%.

Objectives: Provide an online quiz to test knowledge of modulation, provide instant feedback, and track progress.

Welcome to Modulation. The quiz will randomly run 20 questions from Modulation which you have to answer in 10 minutes.

After 10 minutes, your quiz will automatically be submitted and scored.

You can retake the quiz as many times as you want and a different set of questions will be given. The answers will also be randomly arrange.

Please click START QUIZ to start.

The modulation index of an AM wave is changes from 0 to 1. The transmitter power is?

Unchanged

Halved

Increased by 50%

Doubled

What is the main function of a balanced modulator?

Suppress carrier signal in order to create a SSB or DSB

Produce 100% modulation

Produce balanced modulation of a carrier wave

Limit noise picked by a receiver

For _____ percent modulation in AM, the modulation envelope has a peak value double the unmodulated carrier level.

66.67

83.3

100

If the percentage of modulation of an AM amplifier is 88% and the modulation signal is 1 volt, the carrier has an amplitude of _____.

0.12 volt

1.88 volts

1.14 volts

0.88 volt

Operating method in which the transmission is made alternately in each direction of a telecommunication channel.

Half duplex operation

Duplex operation

Semi-duplex operation

Simplex operation

If a 7-A carrier is modulated 100% by a sinusoidal tone, how much does the antenna current increase?

22.5%

66.7%

44.8%

33.3%

What is the carrier swing of an FM transmitter when modulated by 75%?

56.25 kHz

53.2 kHz

112.5 kHz

48 kHz

A form of single sideband emission where the degree of carrier suppression enables the carrier to be reconstituted and be used for demodulation

Full carrier single sideband emission

Half carrier single sideband emission

Reduced carrier single sideband emission

Double sideband emission

What produces splatter in an AM transmission?

overmodulation

Flickering

Clipping

Harmonics

The PM signal produces by an FM circuit is called

Direct PM

Indirect PM

Indirect FM

Direct FM

The modulated carrier power in FM

Decreases with modulating signal power

Is independent of modulating signal power

Increases with modulating signal power

What is the approximate bandwidth of an FM with a modulation factor of 12.5 and a modulating frequency of 10 kHz?

45 kHz

270 kHz

20 kHz

250 kHz

What is an application for vestigial sideband transmission

AM Broadcast

TV Broadcast

FDM

Telephony

The power in FM _____ as the modulation index increases.

Decreases

Increases

Fluctuates

Remain constant

In the designation of bandwidth and emission, what letter in the symbol represents a double-sideband of modulation

Refers to the first symbol in an emission designation with an amplitude modulated main carrier represented by letter A.

Double sideband full carrier

Double sideband

Independent sideband

Single sideband suppressed carrier

In SSB transmission, which sideband can be eliminated?

Lower only

Upper only

Depends upon the use

Either lower or uppedr

What is the main problem in receiving a suppressed carrier transmission or a single sideband transmission?

The selectivity of the receiver must be good.

The receiver needs to reinsert the missing carrier.

The gain of the amplifier must be high

There must be three detectors.

An indirect method of generating FM is a

Reactance tube modulator

Armstrong modulator

Reactance transistor modulator

Varactor diode

In what classes are SSB linear amplifiers operated

B or C

C or D

A or AB

Please fill in the comment box below. This will help us improved our site

Thank you for trying out Modulation. If you comments on the quiz or on our site, please provide your comment.