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MCQs

Total Questions : 40 | Page 4 of 4 pages
Question 31. In India, ___________ modulation is used for radio transmission
  1.    Frequency
  2.    Amplitude
  3.    Phase
  4.    None of the above
 Discuss Question
Answer: Option B. -> Amplitude
Question 32. When the modulating signal controls the frequency of the carrier, we get___________
  1.    Phase modulation
  2.    Amplitude modulation
  3.    Frequency modulation
  4.    May be any one of the above
 Discuss Question
Answer: Option C. -> Frequency modulation
Question 33. In a radio receiver, we generally use ___________ oscillator as a local oscillator
  1.    Crystal
  2.    Wien-bridge
  3.    Phase-shift
  4.    Hartley
 Discuss Question
Answer: Option D. -> Hartley
Question 34. In an AM wave useful power is carrier by ___________
  1.    Carrier
  2.    Sidebands
  3.    Both sidebands and carrier
  4.    None of the above
 Discuss Question
Answer: Option B. -> Sidebands
Question 35. In radio transmission, the medium of transmission is ___________
  1.    Space
  2.    An antenna
  3.    Cable
  4.    None of the above
 Discuss Question
Answer: Option A. -> Space
Question 36. In superhetrodyne receiver, the input at mixer stage is ___________
  1.    IF and RF
  2.    RF and AF
  3.    IF and AF
  4.    RF and local oscillator signal
 Discuss Question
Answer: Option D. -> RF and local oscillator signal
Question 37. The letters AVC stand for ___________
  1.    Audio voltage control
  2.    Abrupt voltage control
  3.    Automatic volume control
  4.    Automatic voltage control
 Discuss Question
Answer: Option C. -> Automatic volume control
Question 38. Overmodulation results in ___________
  1.    Weakening of the signal
  2.    Excessive carrier power
  3.    Distortion
  4.    None of the above
 Discuss Question
Answer: Option C. -> Distortion
Question 39. In a TRF radio receiver, the RF and detection stages are tuned to ___________
  1.    Radio frequency
  2.    IF
  3.    Audio frequency
  4.    None of the above
 Discuss Question
Answer: Option A. -> Radio frequency
Question 40. The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________
  1.    455 kHz
  2.    1310 kHz
  3.    1500 kHz
  4.    1520 kHz
 Discuss Question
Answer: Option B. -> 1310 kHz

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