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MCQs

Total Questions : 100 | Page 6 of 10 pages
Question 51. In a FM waveform, the side bands are spaced at intervals equal to
  1.    four times the modulating frequency
  2.    twice the modulating frequency
  3.    half the modulating frequency
  4.    modulating frequency
 Discuss Question
Answer: Option C. -> half the modulating frequency
Answer: (c).half the modulating frequency
Question 52. The source of which of the following noise is different from that of the remaining?
  1.    Solar noise
  2.    Cosmic noise
  3.    Galactic noise
  4.    Atmospheric noise
 Discuss Question
Answer: Option D. -> Atmospheric noise
Answer: (d).Atmospheric noise
Question 53. The household radio receiver uses
  1.    synchronous
  2.    envelope detector
  3.    radio detector
  4.    none of the above
 Discuss Question
Answer: Option B. -> envelope detector
Answer: (b).envelope detector
Question 54. A receiver having poor IF selectivity will also have poor
  1.    sensitivity
  2.    double spotting
  3.    blocking
  4.    all of the above
 Discuss Question
Answer: Option C. -> blocking
Answer: (c).blocking
Question 55. In a transistor receiver, the use of FET as the first stage amplifier is likely to
  1.    improve selectivity of the receiver
  2.    improve the effectiveness of the AGC
  3.    reduce the effect of negative peak clipping
  4.    reduce the effect of noise at all frequencies
 Discuss Question
Answer: Option C. -> reduce the effect of negative peak clipping
Answer: (c).reduce the effect of negative peak clipping
Question 56. Which are the popular IF frequencies for microwave and radar receivers operating on frequencies in the range 1 to 10 GHz
  1.    30, 60 and 70 kHz
  2.    3, 6 and 7 kHz
  3.    30, 60 and 70 MHz
  4.    3, 6 and 7 GHz
 Discuss Question
Answer: Option C. -> 30, 60 and 70 MHz
Answer: (c).30, 60 and 70 MHz
Question 57. In a ratio detector
  1.    the linearity is worse than in a phase discriminator
  2.    the output is twice that obtainable from a similar phase discriminator
  3.    stabilization against signal strength variations is provided
  4.    the circuit is the same as in a discriminator, except that the diodes are reversed
 Discuss Question
Answer: Option A. -> the linearity is worse than in a phase discriminator
Answer: (a).the linearity is worse than in a phase discriminator
Question 58. Neutralization is used in RF amplifiers to
  1.    stop oscillation
  2.    increase bandwidth
  3.    improve selectivity
  4.    all of the above
 Discuss Question
Answer: Option A. -> stop oscillation
Answer: (a).stop oscillation
Question 59. It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude
  1.    will increase
  2.    will decrease
  3.    will remain constant
  4.    will reduce to negligible value
 Discuss Question
Answer: Option B. -> will decrease
Answer: (b).will decrease
Question 60. A transmitter serial current contains
  1.    carrier frequencies
  2.    audio frequencies
  3.    radio frequencies
  4.    none of the above
 Discuss Question
Answer: Option C. -> radio frequencies
Answer: (c).radio frequencies

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