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MCQs

Total Questions : 50 | Page 5 of 5 pages
Question 41. Indicate the false statement in connection with communications receivers.
  1.    The noise limiter cuts off the receiver’s output during a noise pulse.
  2.    Variable sensitivity is used to eliminate selective fading
  3.    A product demodulator could be used for the reception of Morse code.
  4.    Double conversion is used to improve image rejection
 Discuss Question
Answer: Option B. -> Variable sensitivity is used to eliminate selective fading
Question 42. One of the main functions of the RF amplifier in a superheterodyne receiver is to
  1.    Provide improved tracking
  2.    Improve the rejection of the image frequency
  3.    Permit better adjacent-channel rejection
  4.    Increase the tuning range of the receiver
 Discuss Question
Answer: Option B. -> Improve the rejection of the image frequency
Question 43. The frequency generated by each decade in a direct frequency synthesizer is much higher than the frequency shown; this is done to
  1.    Reduce the spurious frequency problem
  2.    Reduce the number of crystals required
  3.    Reduce the number of decades
  4.    Increase the frequency stability of the synthesizer
 Discuss Question
Answer: Option A. -> Reduce the spurious frequency problem
Question 44. The image frequency of a superheterodyne receiver
  1.    Is independent of the frequency to which the receiver is tuned
  2.    Is created within the receiver itself
  3.    Is due to insufficient adjacent channel rejection
  4.    Is not rejected be the IF tuned circuits
 Discuss Question
Answer: Option D. -> Is not rejected be the IF tuned circuits
Question 45. In a broadcast superheterodyne receiver, the
  1.    Mixer input must be tuned to the signal frequency
  2.    Local oscillator operates below the signal frequency
  3.    Local oscillator frequency is normally double the IF
  4.    RF amplifier normally works at 455 kHz above the carrier frequency
 Discuss Question
Answer: Option A. -> Mixer input must be tuned to the signal frequency
Question 46. Indicate which of the following circuits could not demodulate SSB:
  1.    Product modulator
  2.    Phase discriminator
  3.    Balance modulator
  4.    BFO
 Discuss Question
Answer: Option B. -> Phase discriminator
Question 47. Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:
  1.    Fewer tuned circuits
  2.    Much easier alignment
  3.    Greater limiting
  4.    Better linearity
 Discuss Question
Answer: Option C. -> Greater limiting
Question 48. If the intermediate frequency is very high (indicate false statement)
  1.    The local oscillator need not be extremely stable
  2.    Image frequency rejection is very good
  3.    Tracking will be improved
  4.    The selectivity will be poor
 Discuss Question
Answer: Option C. -> Tracking will be improved
Question 49. A low ratio of the ac to the dc load impedance of a diode detector results in
  1.    Poor AF response
  2.    Poor AGC operation
  3.    Negative-peak clipping
  4.    Diagonal clipping
 Discuss Question
Answer: Option C. -> Negative-peak clipping
Question 50. One of the following cannot be used to demodulate SSB:
  1.    Diode Balance modulator
  2.    Product detector
  3.    Bipolar transistor balanced modulator
  4.    Complete phase-shift generator
 Discuss Question
Answer: Option C. -> Bipolar transistor balanced modulator

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