Modulation and Demodulation Quiz | Modulation and Demodulation Objective Type Questions and Answers

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Questions
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

Answer: µV
22 Man made noise are …………. variations.
A Amplitude
B Frequency
C Phase
D Both phase and frequency

Answer: Amplitude
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23 In a radio receiver, noise is generally developed at ………….
A IF stage
B Receiving antenna
C Audio stage
D RF stage

Answer: RF stage
24 In TV transmission, picture signal is ……………… modulated
A Frequency
B Phase
C Amplitude
D None of the above

Answer: Amplitude
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

Answer: Sideband
26 In radio transmission, the medium of transmission is ……………..
A Space
B An antenna
C Cable
D None of the above

Answer: Space
27 A high Q tuned circuit will permit an amplifier to have high ……………
A Fidelity
B Frequency range
C Sensitivity
D Selectivity

Answer: Selectivity
28 Demodulation is done in …………
A Receiving antenna
B Transmitter
C Radio receiver
D Transmitting antenna

Answer: Radio receiver
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

Answer: Remains the same
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

Answer: Equal to
31 Overmodulation results in …………..
A Weakening of the signal
B Excessive carrier power
C Distortion
D None of the above

Answer: Distortion
32 At 100% modulation, the power in each sideband is ………………… of that of carrier
A 50%
B 40%
C 60%
D 25%

Answer: 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

Answer: Carrier
34 Overmodulation (amplitude) occurs when signal amplitude is …………. carrier amplitude
A Equal to
B Greater than
C Less than
D None of the above

Answer: Greater than
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

Answer: Amplitude
36 In amplitude modulation, bandwidth is ……………. the audio signal frequency
A Thrice
B Four times
C Twice
D None of the above

Answer: Twice
37 In an AM wave useful power is carrier by ………….
A Carrier
B Sidebands
C Both sidebands and carrier
D None of the above

Answer: Sidebands
38 In India, ……………. modulation is used for radio transmission
A Frequency
B Amplitude
C Phase
D None of the above

Answer: Amplitude
39 In a transmitter ……………. oscillator is used
A Hartley
B RC phase-shift
C Wien-bridge
D Crystal

Answer: Crystal
40 Modulation is done in …………..
A Transmitter
B Radio receiver
C Between transmitter and radio receiver
D None of the above

Answer: Transmitter

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