Modulation and Demodulation MCQ

Modulation and Demodulation MCQ

  • Admin
  • 17th Apr, 2021

Modulation and Demodulation MCQ Test

Following are mostly asked Modulation and demodulation MCQ test that are designed for professionals like you to crack you interviews. You can take this Modulation and demodulation online test before appearing to you real interview. This Modulation and demodulation quiz there are around 30+ multiple choice questions on Modulation and demodulation with four options.

1) Modulation is done in _____.

  • A. Transmitter
  • B. Radio receiver
  • C. Both A and B
  • D. None of the above

2) Demodulation is done in ____.

  • A. Transmitter
  • B. Radio receiver
  • C. Transmitting antenna
  • D. Receiving antenna

3) At 100% modulation, the power in each sideband is 25% of that of carrier.

  • A. True
  • B. False

4) Which oscillator is used in a transmitter?

  • A. Hartley
  • B. Wien-bridge
  • C. RC phase-shift
  • D. Crystal

5) If level of modulation is increased Sideband power is increased.

  • A. True
  • B. False

6) Man made noise are _____.

  • A. Phase variations
  • B. Frequency variations
  • C. Amplitude variations
  • D. Both phase and frequency variations

7) In TV transmission, picture signal is ______.

  • A. Frequency modulated
  • B. Amplitude modulated
  • C. Both A and B
  • D. None of the above

8) In TV transmission, sound signal is ____.

  • A. Phase modulated
  • B. Frequency modulated
  • C. Both A and B
  • D. None of the above

9) In amplitude modulation, the ___________ of carrier is varied according to the strength of the signal.

  • A. Phase
  • B. Frequency
  • C. Amplitude
  • D. None of the above

10) The major advantage of FM over AM is ________ .

  • A. Smaller bandwidth
  • B. Higher carrier frequency
  • C. Small frequency deviation
  • D. Reception is less noisy

11) In an AM wave, the majority of the power is in Carrier.

  • A. True
  • B. False

12) As the modulation level is increased, the carrier power _____.

  • A. Is increased
  • B. Is decreased
  • C. Remains the same
  • D. None of the above

13) Noise in a radio receiver is generally developed at ______ .

  • A. Receiving antenna
  • B. Audio stage
  • C. IF stage
  • D. RF stage

14) Ferrite antenna is used to ____.

  • A. Stabilise d.c. bias
  • B. Increase the Q of tuned circuit
  • C. Reduce noise
  • D. Reduce stray capacitance

15) The signal voltage induced in the aerial of a radio receiver is of the order of ┬ÁV.

  • A. True
  • B. False

16) Hartley oscillator is used as a local oscillator in a radio receiver.

  • A. True
  • B. False

17) The medium of transmission in radio transmission is_____.

  • A. Cable
  • B. Space
  • C. An antenna
  • D. None of the above

18) Overmodulation results in _____.

  • A. Excessive carrier power
  • B. Distortion
  • C. Weakening of the signal
  • D. None of the above

19) AVC stand for

  • A. Audio voltage control
  • B. Automatic voltage control
  • C. Abrupt voltage control
  • D. Automatic volume control

20) The RF and detection stages in a TRF radio receiver are tuned to Radio frequency.

  • A. True
  • B. False

21) Superhertodyne principle refers to _____.

  • A. Using a push-pull circuit
  • B. Using a large number of amplifier stages
  • C. Obtaining lower fixed intermediate frequency
  • D. None of the above

22) The input at mixer stage in superhetrodyne receiver is ____ .

  • A. RF and AF
  • B. IF and RF
  • C. IF and AF
  • D. RF and local oscillator signal

23) We get ______ ,when the modulating signal controls the frequency of the carrier.

  • A. Phase modulation
  • B. Amplitude modulation
  • C. Frequency modulation
  • D. None of the above

24) The line connecting the positive and negative peaks of the carrier waveform is known as _______.

  • A. Peak line
  • B. Envelope
  • C. Modulation index
  • D. Maximum amplitude ceiling

25) What happens due to Distortion?

  • A. Amplified information
  • B. Attenuated information
  • C. Error information
  • D. Total information loss

26) The circuit used for producing AM is known as _______.

  • A. Modulator
  • B. Receiver
  • C. Duplexer
  • D. Transmitter

27) Over-modulation occur when modulating signal voltage is ______.

  • A. Greater-than Carrier voltage
  • B. Less-than Carrier voltage
  • C. Equal to Carrier voltage
  • D. Equal to Zero

28) Modulating wave is also known as ______.

  • A. EM wave
  • B. Measuring wave
  • C. Modular wave
  • D. Carrier wave

29) The reference line for the modulating signal is the carrier peak line.

  • A. True
  • B. False

30) How many types of modulation exist?

  • A. 6
  • B. 4
  • C. 5
  • D. 3

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