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Electrical Engineering
Modulation And Demodulation
Quiz 4
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Q.1
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ___________
Sensitivity
Selectivity
Distortion
Fidelity
Q.2
In amplitude modulation, bandwidth is ___________ the audio signal frequency
Thrice
Four times
Twice
None of the above
Q.3
In amplitude modulation, bandwidth is ___________ the audio signal frequency
Thrice
Four times
Twice
None of the above
Q.4
AV carrier is made to vary betweenV andV by the signal. What is the modulation factor?
3
6
5
None of the above
Q.5
In TV transmission, picture signal is ___________ modulated
Frequency
Phase
Amplitude
None of the above
Q.6
The superhetrodyne principle provides selectivity at ___________ stage
RF
IF
audio
Before RF
Q.7
Most of the amplification in a superhetrodyne receiver occurs at ___________ stage
IF
RF amplifier
Audio amplifier
Detector
Q.8
In TV transmission, sound signal is ___________ modulated
Amplitude
Frequency
Phase
None of the above
Q.9
Man made noise are ___________ variations.
Amplitude
Frequency
Phase
Both phase and frequency
Q.10
If modulation isthen signal amplitude is ___________ carrier amplitude
Equal to
Greater than
Less than
None of the above
Q.11
Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude
Equal to
Greater than
Less than
None of the above
Q.12
If level of modulation is increased ___________ power is increased
Carrier
Sideband
Carrier as well as sideband
None of the above
Q.13
In a transmitter ___________ oscillator is used
Hartley
RC phase-shift
Wien-bridge
Crystal
Q.14
Atmodulation, the power in each sideband is ___________ of that of carrier
50%
40%
60%
25%
Q.15
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
Q.16
In the above question, what is the power in sidebands?
8 kW
6 kW
06 kW
9 kW
Q.17
Demodulation is done in ___________
Receiving antenna
Transmitter
Radio receiver
Transmitting antenna
Q.18
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
Q.19
In fiber optics, the signal is _______ waves.
light
radio
infrared
very low frequency
Q.20
High data rate digital communication needs to operate on which end of the frequency spectrum?
Low end (KHz)
High end (GHz)
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