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Electrical Engineering
Modulation And Demodulation
Quiz 3
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Q.1
In radio transmission, the medium of transmission is ___________
Space
An antenna
Cable
None of the above
Q.2
In a radio receiver, we generally use ___________ oscillator as a local oscillator
Crystal
Wien-bridge
Phase-shift
Hartley
Q.3
In an AM wave useful power is carrier by ___________
Carrier
Sidebands
Both sidebands and carrier
None of the above
Q.4
When the modulating signal controls the frequency of the carrier, we get___________
Phase modulation
Amplitude modulation
Frequency modulation
May be any one of the above
Q.5
In India, ___________ modulation is used for radio transmission
Frequency
Amplitude
Phase
None of the above
Q.6
The diode detector in an AM radio receiver is usually found ___________
Before the first RF stage
After the first RF stage
After several stages of amplification
None of the above
Q.7
In a radio receiver, noise is generally developed at ___________
IF stage
Receiving antenna
Audio stage
RF stage
Q.8
The diode detector in an AM radio receiver is usually found ___________
Before the first RF stage
After the first RF stage
After several stages of amplification
None of the above
Q.9
The function of ferrite antenna is to ___________
Reduce stray capacitance
Stabilise d.c. bias
Increase the Q of tuned circuit
Reduce noise
Q.10
If Amin =and Amax =what is the percentage of modulation?
20%
40%
50%
10%
Q.11
If Amin =and Amax =what is the percentage of modulation?
20%
40%
50%
10%
Q.12
The signal voltage induced in the aerial of a radio receiver is of the order of ___________
mV
µV
V
None of the above
Q.13
The function of ferrite antenna is to ___________
Reduce stray capacitance
Stabilise d.c. bias
Increase the Q of tuned circuit
Reduce noise
Q.14
Modulation is done in ___________
Transmitter
Radio receiver
Between transmitter and radio receiver
None of the above
Q.15
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.16
As the modulation level is increased, the carrier power ___________
Is increased
Remains the same
Is decreased
None of the above
Q.17
In an AM wave, the majority of the power is in ___________
Lower sideband
Upper sideband
Carrier
None of the above
Q.18
AkW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
50 kW
5 kW
8 kW
25 kW
Q.19
In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.
Amplitude
Frequency
Phase
None of the above
Q.20
A high Q tuned circuit will permit an amplifier to have high ___________
Fidelity
Frequency range
Sensitivity
Selectivity
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