Modulation MCQ - MCQTrip

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In SSB transmission, which sideband can be eliminated?

Lower only

Upper only

Depends upon the use

Either lower or uppedr

None

In a narrow-band FM system, the deviation ratio is commonly one and the highest audio frequency is generally limited to

3,000 Hz

7,500 Hz

10,000 Hz

300 Hz

None

A superheterodyne is tuned to 2738 kHz. The IF is 475 kHz. What is the image frequency?

4.5 kHz

3688 kHz

3.09 MHz

4385 kHz

None

The rms antenna current for an AM transmitter increases by 15% over the unmodulated value when sinusoidal modulation is applied. Find the depth of modulation

0.75

0.05

0.8

0.6

None

What is the carrier power transmitted on a 75-Ω antenna if mf=2 and Vc (unmodulated) is 2 kVpk?

9 kW

12.9 kW

10 kW

1.29 kW

None

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

Single sideband suppressed carrier

Double sideband

Independent sideband

Double sideband full carrier

None

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

The receiver needs to reinsert the missing carrier.

The gain of the amplifier must be high

There must be three detectors.

The selectivity of the receiver must be good.

None

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

Reduced carrier single sideband emission

Double sideband emission

Full carrier single sideband emission

Half carrier single sideband emission

None

In an FM receiver, which circuit removes amplitude variations?

Limiter

Discriminator

Exciter

Mixer

None

The values of Vmax and Vmin as read from an AM wave on an oscilloscope are 2.8 and 0.3. The percentage of the modulation is

10.7 percent

41.4 percent

80.6 percent

93.3 percent

None

The term used to refer to the condition where the signals from a very strong station are superimposed on other signals being received

Capture effect

Cross-modulation interference

Receiver quieting

Intermodulation interference

None

In what classes are SSB linear amplifiers operated

C or D

A or AB

B or C

None

Modulation in which the modulated wave is always present.

Log-periodic modulation

Front-end

Continues modulation

Carrier modulation

None

Modulation means

varying of information

utilization of a single transmission channels to carry multiple signals

transmit pulse in DC form on a copper wire

varying of some parameters of a carrier such as its amplitude to transmit information

None

The rms antenna current for an AM transmitter increases by 15% over the unmodulated value when sinusoidal modulation is applied. Find the depth of modulation.

0.6

0.75

0.8

0.05

None

What is the result of overmodulation of an FM emission?

Lower frequency

Excessive bandwidth distortion

Higher power

distortion

None

What pattern of modulation must used when neutralizing an operating transmitter?

10%

80%

50%

100% or over

None

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

66.7%

22.5%

33.3%

44.8%

None

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

None

What is an application for vestigial sideband transmission

FDM

Telephony

TV Broadcast

AM Broadcast

None

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