Modulation MCQ - MCQTrip

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

There must be three detectors.

The selectivity of the receiver must be good.

The gain of the amplifier must be high

The receiver needs to reinsert the missing carrier.

None

What is the result of overmodulation of an FM emission?

distortion

Lower frequency

Higher power

Excessive bandwidth distortion

None

The PM signal produces by an FM circuit is called

Indirect FM

Direct PM

Direct FM

Indirect PM

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

80.6 percent

10.7 percent

93.3 percent

41.4 percent

None

An AM signal displayed on an oscilloscope has a maximum span of 5 V and a minimum of 1 V. What is the modulation index?

20%

120%

67%

60%

None

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

1.14 volts

1.88 volts

0.88 volt

None

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

None

How does a SSB transmitter output power normally expressed?

In term of peak envelope power

Average power

In term of peak-to-peak power

Peak power

None

Modulation means

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

varying of information

None

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

66.67

83.3

100

None

Modulation in which the modulated wave is always present.

Front-end

Carrier modulation

Log-periodic modulation

Continues modulation

None

In what classes are SSB linear amplifiers operated

B or C

A or AB

C or D

None

The bandwidth in _____ depends on the number of significant sidebands

QAM

Delta Modulation

Frequency Modulation

FCM

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.

0.8

0.6

0.05

0.75

None

What is the main function of a balanced modulator?

Produce balanced modulation of a carrier wave

Limit noise picked by a receiver

Suppress carrier signal in order to create a SSB or DSB

Produce 100% modulation

None

What is the power saving when the carrier is suppressed in a regular AM signal modulated to an index of 100%?

66.7%

100%

33.33%

16.7%

None

Modulation in which the modulated wave is always present.

Carrier modulation

Front-end

Log-periodic modulation

Continues modulation

None

What is the ratio of maximum deviation allowed to the modulating frequency being used called?

Modulation Sideband

Percent Modulation

Deviation ratio

Modulation Index

None

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

300 Hz

3,000 Hz

7,500 Hz

10,000 Hz

None

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

Receiver quieting

Intermodulation interference

Cross-modulation interference

Capture effect

None

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