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MCQs

Total Questions : 100 | Page 10 of 10 pages
Question 91. The function of an AM detector circuit is to
  1.    rectify the input signal
  2.    discard the carrier
  3.    provide audio signal
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 92. Which of the following is same in AM and FM receivers?
  1.    Demodulator
  2.    AGC
  3.    IF amplifier
  4.    All of the above
 Discuss Question
Answer: Option C. -> IF amplifier
Answer: (c).IF amplifier
Question 93. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?
  1.    Variable selectivity
  2.    Variable sensitivity
  3.    Double conversion
  4.    Squelch
 Discuss Question
Answer: Option B. -> Variable sensitivity
Answer: (b).Variable sensitivity
Question 94. Most popular IF for receivers tuning to 540 to 1650 kHz is
  1.    433 kHz
  2.    455 kHz
  3.    545 kHz
  4.    555 kHz
 Discuss Question
Answer: Option B. -> 455 kHz
Answer: (b).455 kHz
Question 95. In superheterodyne receivers, the local oscillator is used to
  1.    detect the modulating signal
  2.    amplify the received modulated carrier
  3.    shift the frequency of the received modulated carrier to the IF band
  4.    None of the above
 Discuss Question
Answer: Option C. -> shift the frequency of the received modulated carrier to the IF band
Answer: (c).shift the frequency of the received modulated carrier to the IF band
Question 96. A notch filter is sometimes used in communication receivers to
  1.    reduce receiver gain at some specific frequency
  2.    increase receiver gain at some specific frequency
  3.    made selectivity more precise
  4.    spread the bandwidth
 Discuss Question
Answer: Option A. -> reduce receiver gain at some specific frequency
Answer: (a).reduce receiver gain at some specific frequency
Question 97. Which one of the following is not a useful quantity for comparing the noise performance of receivers?
  1.    Noise figure
  2.    Noise temperature
  3.    Input noise voltage
  4.    Equivalent noise resistance
 Discuss Question
Answer: Option C. -> Input noise voltage
Answer: (c).Input noise voltage
Question 98. Which of the following statement about the amplitude limiter is not valid?
  1.    Leak type bias must be used
  2.    Output must be tuned
  3.    The circuit is always biased in class C, by virtue of the leak type bias
  4.    When the input increases past the threshold of limiting, the gain decreases to keep the output constant
 Discuss Question
Answer: Option C. -> The circuit is always biased in class C, by virtue of the leak type bias
Answer: (c).The circuit is always biased in class C, by virtue of the leak type bias
Question 99. In a radio receiver, if the intermediate frequency is too low
  1.    Image-frequency rejection will improve
  2.    Selectivity will be too sharp
  3.    The frequency selectivity of the local oscillator will have to be lowered
  4.    All of the above
 Discuss Question
Answer: Option B. -> Selectivity will be too sharp
Answer: (b).Selectivity will be too sharp
Question 100. FM amplifier in a superheterodyne receiver
  1.    increases selectivity
  2.    suppresses noise
  3.    provides improved tracking
  4.    improves the rejection of the image frequency
 Discuss Question
Answer: Option D. -> improves the rejection of the image frequency
Answer: (d).improves the rejection of the image frequency

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