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MCQs

Total Questions : 100 | Page 1 of 10 pages
Question 1. In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
  1.    750 kHz
  2.    990 kHz
  3.    1650 kHz
  4.    2100 kHz
 Discuss Question
Answer: Option D. -> 2100 kHz
Answer: (d).2100 kHz
Question 2. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at 25 MHz will be
  1.    1.116
  2.    1.386
  3.    2.116
  4.    2.386
 Discuss Question
Answer: Option A. -> 1.116
Answer: (a).1.116
Question 3. As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?
  1.    High gain and better sensitivity
  2.    Better selectivity at high frequencies
  3.    Stability
  4.    Noise suppression
 Discuss Question
Answer: Option A. -> High gain and better sensitivity
Answer: (a).High gain and better sensitivity
Question 4. If the intermediate frequency of a superheterodyne receiver falls within the tuning range of the receiver
  1.    Unsuitability will occur
  2.    Heterodyne whistles will be heard
  3.    Tuning to the frequency band immediately adjacent to the intermediate frequency will become impossible
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 5. The selectivity of a radio receiver is
  1.    its ability to reject adjacent unwanted signals
  2.    its ability to amplify weak signals
  3.    the frequency at which it gives maximum amplification to signal.
  4.    its ability to suppress noise.
 Discuss Question
Answer: Option A. -> its ability to reject adjacent unwanted signals
Answer: (a).its ability to reject adjacent unwanted signals
Question 6. Which of the following produces upper and lower side frequencies?
  1.    Microphone
  2.    Demodulator in a superheterodyne receiver
  3.    Modulator in a. radio transmitter
  4.    Oscillator in a receiver
 Discuss Question
Answer: Option A. -> Microphone
Answer: (a).Microphone
Question 7. In a receiver, at higher frequencies
  1.    tracking will be improved
  2.    tracking will be poor
  3.    selectivity will be poor
  4.    image frequency rejection will be poor
 Discuss Question
Answer: Option A. -> tracking will be improved
Answer: (a).tracking will be improved
Question 8. Which of the following circuit cannot be used to demodulate SSB?
  1.    Phase discriminator
  2.    Produce detector
  3.    Balanced modulator
  4.    Beat frequency oscillator
 Discuss Question
Answer: Option A. -> Phase discriminator
Answer: (a).Phase discriminator
Question 9. The passband of the tuned circuits of a radio receiver should be equal to
  1.    20 kHz
  2.    455 kHz
  3.    1455 kHz
  4.    more than 455 kHz
 Discuss Question
Answer: Option A. -> 20 kHz
Answer: (a).20 kHz
Question 10. High IF in a superheat receiver
  1.    improves selectivity
  2.    increases tracking problems
  3.    decreases tracking problems
  4.    reduces adjacent channel rejection
 Discuss Question
Answer: Option B. -> increases tracking problems
Answer: (b).increases tracking problems

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