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Electrical Engineering
Modulation And Demodulation
Quiz 1
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Q.1
In India, ___________ modulation is used for radio transmission
Frequency
Amplitude
Phase
None of the above
Q.2
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.3
In a radio receiver, noise is generally developed at ___________
IF stage
Receiving antenna
Audio stage
RF stage
Q.4
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.5
The function of ferrite antenna is to ___________
Reduce stray capacitance
Stabilise d.c. bias
Increase the Q of tuned circuit
Reduce noise
Q.6
In superhetrodyne receiver, the input at mixer stage is ___________
IF and RF
RF and AF
IF and AF
RF and local oscillator signal
Q.7
Overmodulation results in ___________
Weakening of the signal
Excessive carrier power
Distortion
None of the above
Q.8
A 50 kW 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.9
The major advantage of FM over AM is ___________
Reception is less noisy
Higher carrier frequency
Smaller bandwidth
Small frequency deviation
Q.10
In an AM wave, the majority of the power is in ___________
Lower sideband
Upper sideband
Carrier
None of the above
Q.11
In an AM wave useful power is carrier by ___________
Carrier
Sidebands
Both sidebands and carrier
None of the above
Q.12
In a radio receiver, we generally use ___________ oscillator as a local oscillator
Crystal
Wien-bridge
Phase-shift
Hartley
Q.13
In radio transmission, the medium of transmission is ___________
Space
An antenna
Cable
None of the above
Q.14
A high Q tuned circuit will permit an amplifier to have high ___________
Fidelity
Frequency range
Sensitivity
Selectivity
Q.15
If a radio receiver amplifies all the signal frequencies equally well, it is said to have high ___________
Sensitivity
Selectivity
Distortion
Fidelity
Q.16
If Amin = 40 and Amax = 60, what is the percentage of modulation?
20%
40%
50%
10%
Q.17
The signal voltage induced in the aerial of a radio receiver is of the order of ___________
mV
µV
V
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
In a TRF radio receiver, the RF and detection stages are tuned to ___________
Radio frequency
IF
Audio frequency
None of the above
Q.20
The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________
455 kHz
1310 kHz
1500 kHz
1520 kHz
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