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Free download in PDF Modulation and Demodulation Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
The signal voltage induced in the aerial of a radio receiver is of the order of …………….
[A]
mV
[B]
µV
[C]
V
[D]
None of the above
(22)
Man made noise are …………. variations.
[A]
Amplitude
[B]
Frequency
[C]
Phase
[D]
Both phase and frequency
(23)
In a radio receiver, noise is generally developed at ………….
[A]
IF stage
[B]
Receiving antenna
[C]
Audio stage
[D]
RF stage
(24)
In TV transmission, picture signal is ……………… modulated
[A]
Frequency
[B]
Phase
[C]
Amplitude
[D]
None of the above
(25)
If level of modulation is increased ……………. power is increased
[A]
Carrier
[B]
Sideband
[C]
Carrier as well as sideband
[D]
None of the above
(26)
In radio transmission, the medium of transmission is ……………..
[A]
Space
[B]
An antenna
[C]
Cable
[D]
None of the above
(27)
A high Q tuned circuit will permit an amplifier to have high ……………
[A]
Fidelity
[B]
Frequency range
[C]
Sensitivity
[D]
Selectivity
(28)
Demodulation is done in …………
[A]
Receiving antenna
[B]
Transmitter
[C]
Radio receiver
[D]
Transmitting antenna
(29)
As the modulation level is increased, the carrier power …………..
[A]
Is increased
[B]
Remains the same
[C]
Is decreased
[D]
None of the above
(30)
If modulation is 100% then signal amplitude is ………….. carrier amplitude
[A]
Equal to
[B]
Greater than
[C]
Less than
[D]
None of the above
31
Overmodulation results in …………..
[A]
Weakening of the signal
[B]
Excessive carrier power
[C]
Distortion
[D]
None of the above
32
At 100% modulation, the power in each sideband is ………………… of that of carrier
[A]
50%
[B]
40%
[C]
60%
[D]
25%
33
In an AM wave, the majority of the power is in …………….
[A]
Lower sideband
[B]
Upper sideband
[C]
Carrier
[D]
None of the above
34
Overmodulation (amplitude) occurs when signal amplitude is …………. carrier amplitude
[A]
Equal to
[B]
Greater than
[C]
Less than
[D]
None of the above
35
In amplitude modulation, the ………… of carrier is varied according to the strength of the signal.
[A]
Amplitude
[B]
Frequency
[C]
Phase
[D]
None of the above
36
In amplitude modulation, bandwidth is ……………. the audio signal frequency
[A]
Thrice
[B]
Four times
[C]
Twice
[D]
None of the above
37
In an AM wave useful power is carrier by ………….
[A]
Carrier
[B]
Sidebands
[C]
Both sidebands and carrier
[D]
None of the above
38
In India, ……………. modulation is used for radio transmission
[A]
Frequency
[B]
Amplitude
[C]
Phase
[D]
None of the above
39
In a transmitter ……………. oscillator is used
[A]
Hartley
[B]
RC phase-shift
[C]
Wien-bridge
[D]
Crystal
40
Modulation is done in …………..
[A]
Transmitter
[B]
Radio receiver
[C]
Between transmitter and radio receiver
[D]
None of the above
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