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Electrical Engineering
Modulation And Demodulation
Quiz 2
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Q.1
As the modulation level is increased, the carrier power ___________
Is increased
Remains the same
Is decreased
None of the above
Q.2
Modulation refers to a low-frequency signal controlling the ___________
Amplitude of the carrier
Frequency of the carrier
Phase of the carrier
May be any of the above
Q.3
In amplitude modulation, bandwidth is ___________ the audio signal frequency
Thrice
Four times
Twice
None of the above
Q.4
A 100 V carrier is made to vary between 160 V and 40 V by the signal. What is the modulation factor?
3
6
5
None of the above
Q.5
Man made noise are ___________ variations.
Amplitude
Frequency
Phase
Both phase and frequency
Q.6
In TV transmission, picture signal is ___________ modulated
Frequency
Phase
Amplitude
None of the above
Q.7
In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
Amplitude
Frequency
Phase
None of the above
Q.8
In TV transmission, sound signal is ___________ modulated
Amplitude
Frequency
Phase
None of the above
Q.9
Most of the amplification in a superhetrodyne receiver occurs at ___________ stage
IF
RF amplifier
Audio amplifier
Detector
Q.10
The superhetrodyne principle provides selectivity at ___________ stage
RF
IF
audio
Before RF
Q.11
At 100% modulation, the power in each sideband is ___________ of that of carrier
50%
40%
60%
25%
Q.12
In a transmitter ___________ oscillator is used
Hartley
RC phase-shift
Wien-bridge
Crystal
Q.13
If level of modulation is increased ___________ power is increased
Carrier
Sideband
Carrier as well as sideband
None of the above
Q.14
Overmodulation (amplitude) occurs when signal amplitude is ___________ carrier amplitude
Equal to
Greater than
Less than
None of the above
Q.15
If modulation is 100% then signal amplitude is ___________ carrier amplitude
Equal to
Greater than
Less than
None of the above
Q.16
The IF iskHz. If the radio receiver is tuned tokHz, the local oscillator frequency is ___________
455 kHz
1310 kHz
1500 kHz
1520 kHz
Q.17
In a TRF radio receiver, the RF and detection stages are tuned to ___________
Radio frequency
IF
Audio frequency
None of the above
Q.18
The letters AVC stand for ___________
Audio voltage control
Abrupt voltage control
Automatic volume control
Automatic voltage control
Q.19
Overmodulation results in ___________
Weakening of the signal
Excessive carrier power
Distortion
None of the above
Q.20
In superhetrodyne receiver, the input at mixer stage is ___________
IF and RF
RF and AF
IF and AF
RF and local oscillator signal
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