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MCQs

Total Questions : 50 | Page 3 of 5 pages
Question 21. Indicate the false statement in connection with communications receivers.
  1.    The noise limiter cuts off the receiver’s output during a noise pulse.
  2.    A product demodulator could be used for the reception of Morse code.
  3.    Double conversion is used to improve image rejection
  4.    Variable sensitivity is used to eliminate selective fading
 Discuss Question
Answer: Option D. -> Variable sensitivity is used to eliminate selective fading
Question 22. 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.    Increase the frequency stability of the synthesizer
  3.    Reduce the number of decades
  4.    Reduce the number of crystals required
 Discuss Question
Answer: Option A. -> Reduce the spurious frequency problem
Question 23. One of the main functions of the RF amplifier in a superheterodyne receiver is to
  1.    Provide improved tracking
  2.    Permit better adjacent-channel rejection
  3.    Increase the tuning range of the receiver
  4.    Improve the rejection of the image frequency
 Discuss Question
Answer: Option D. -> Improve the rejection of the image frequency
Question 24. In a broadcast superheterodyne receiver, the
  1.    Local oscillator operates below the signal frequency
  2.    Mixer input must be tuned to 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 B. -> Mixer input must be tuned to the signal frequency
Question 25. The image frequency of a superheterodyne receiver
  1.    Is created within the receiver itself
  2.    Is due to insufficient adjacent channel rejection
  3.    Is not rejected be the IF tuned circuits
  4.    Is independent of the frequency to which the receiver is tuned
 Discuss Question
Answer: Option C. -> Is not rejected be the IF tuned circuits
Question 26. The controlled oscillator synthesizer is sometimes preferred over the direct one because
  1.    It is relatively free of spurious frequency
  2.    It is a simpler piece of equipment
  3.    Its frequency stability is better
  4.    It does not require crystal oscillator
 Discuss Question
Answer: Option A. -> It is relatively free of spurious frequency
Question 27. A receiver has poor IF selectivity. It will therefore also have poor
  1.    Double-spotting
  2.    Sensitivity
  3.    Blocking
  4.    Diversion reception
 Discuss Question
Answer: Option C. -> Blocking
Question 28. The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency
  1.    To help the image frequency rejection
  2.    To permit easier tracking
  3.    To allow adequate frequency coverage without switching
  4.    Because otherwise an intermediate frequency could not be produced
 Discuss Question
Answer: Option C. -> To allow adequate frequency coverage without switching
Question 29. A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is
  1.    1650 kHz
  2.    900 kHz
  3.    2100 kHz
  4.    750 kHz
 Discuss Question
Answer: Option C. -> 2100 kHz
Question 30. Show which of the following statements about the amplitude limiter is untrue:
  1.    The circuit is always biased in class C, by virtue of the leak-type bias.
  2.    When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
  3.    Leak-type bias must be used
  4.    The output must be tuned
 Discuss Question
Answer: Option A. -> The circuit is always biased in class C, by virtue of the leak-type bias.

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