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MCQs

Total Questions : 100 | Page 5 of 10 pages
Question 41. Vividh Bharati programme is transmitted in
  1.    short wave
  2.    medium frequency
  3.    very high frequency
  4.    all of the above
 Discuss Question
Answer: Option B. -> medium frequency
Answer: (b).medium frequency
Question 42. A trimmer is basically a
  1.    insulator
  2.    inductor
  3.    capacitor
  4.    variable resistor
 Discuss Question
Answer: Option C. -> capacitor
Answer: (c).capacitor
Question 43. Noise limiter is provided on AM receivers to
  1.    reduce interfering noise due to ignition system
  2.    reduce noise due to electrical storms
  3.    reduce interference due to electrical machinery
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 44. A low ratio of the A.C. load impedance of a diode detector results in
  1.    diagonal clipping
  2.    poor AGC operation
  3.    poor AF response
  4.    negative peak clipping
 Discuss Question
Answer: Option D. -> negative peak clipping
Answer: (d).negative peak clipping
Question 45. The image frequency of a superheterodyne receiver is
  1.    independent of the frequency at which the receiver is tuned
  2.    always outside the operating range of the receiver
  3.    typical to FM receivers only
  4.    not rejected by the IF tuned circuits
 Discuss Question
Answer: Option C. -> typical to FM receivers only
Answer: (c).typical to FM receivers only
Question 46. The sensitivity of a superheterodyne receiver is determined by
  1.    the gain IF amplifier
  2.    the gain of RF amplifier
  3.    the noise figure
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 47. In a radio receiver
  1.    all stages contribute equally to noise
  2.    RF stage has no effect on S/N ratio
  3.    mixer stage contributes most of the noise generated
  4.    None of the above
 Discuss Question
Answer: Option C. -> mixer stage contributes most of the noise generated
Answer: (c).mixer stage contributes most of the noise generated
Question 48. In radio receiver, the maximum contribution to noise is from
  1.    mixer stage
  2.    power supply
  3.    power amplifier
  4.    equally from above three
 Discuss Question
Answer: Option C. -> power amplifier
Answer: (c).power amplifier
Question 49. In a radio receiver
  1.    the local oscillator frequency is made higher than the incoming signal frequency
  2.    the local oscillator frequency is made lower than the incoming signal frequency
  3.    the local oscillator frequency is made equal to the incoming signal frequency
  4.    None of the above
 Discuss Question
Answer: Option A. -> the local oscillator frequency is made higher than the incoming signal frequency
Answer: (a).the local oscillator frequency is made higher than the incoming signal frequency
Question 50. Power spectral density of white noise
  1.    is constant with frequency
  2.    increases with frequency
  3.    decreases with frequency
  4.    none
 Discuss Question
Answer: Option A. -> is constant with frequency
Answer: (a).is constant with frequency

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