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MCQs

Total Questions : 40 | Page 3 of 4 pages
Question 21. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?
  1.    50 kW
  2.    5 kW
  3.    8 kW
  4.    25 kW
 Discuss Question
Answer: Option A. -> 50 kW
Question 22. The major advantage of FM over AM is ___________
  1.    Reception is less noisy
  2.    Higher carrier frequency
  3.    Smaller bandwidth
  4.    Small frequency deviation
 Discuss Question
Answer: Option A. -> Reception is less noisy
Question 23. As the modulation level is increased, the carrier power ___________
  1.    Is increased
  2.    Remains the same
  3.    Is decreased
  4.    None of the above
 Discuss Question
Answer: Option B. -> Remains the same
Question 24. In an AM wave, the majority of the power is in ___________
  1.    Lower sideband
  2.    Upper sideband
  3.    Carrier
  4.    None of the above
 Discuss Question
Answer: Option C. -> Carrier
Question 25. Modulation refers to a low-frequency signal controlling the ___________
  1.    Amplitude of the carrier
  2.    Frequency of the carrier
  3.    Phase of the carrier
  4.    May be any of the above
 Discuss Question
Answer: Option D. -> May be any of the above
Question 26. In a radio receiver, noise is generally developed at ___________
  1.    IF stage
  2.    Receiving antenna
  3.    Audio stage
  4.    RF stage
 Discuss Question
Answer: Option D. -> RF stage
Question 27. The diode detector in an AM radio receiver is usually found ___________
  1.    Before the first RF stage
  2.    After the first RF stage
  3.    After several stages of amplification
  4.    None of the above
 Discuss Question
Answer: Option C. -> After several stages of amplification
Question 28. The function of ferrite antenna is to ___________
  1.    Reduce stray capacitance
  2.    Stabilise d.c. bias
  3.    Increase the Q of tuned circuit
  4.    Reduce noise
 Discuss Question
Answer: Option C. -> Increase the Q of tuned circuit
Question 29. If Amin = 40 and Amax = 60, what is the percentage of modulation?
  1.    20%
  2.    40%
  3.    50%
  4.    10%
 Discuss Question
Answer: Option A. -> 20%
Question 30. The signal voltage induced in the aerial of a radio receiver is of the order of ___________
  1.    mV
  2.    µV
  3.    V
  4.    None of the above
 Discuss Question
Answer: Option B. -> µV

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