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MCQs

Total Questions : 100 | Page 9 of 10 pages
Question 81. The IF stage of a receiver employs
  1.    capacitive coupling
  2.    impedance coupling
  3.    double-tuned transformer coupling
  4.    single-tuned transformer coupling
 Discuss Question
Answer: Option C. -> double-tuned transformer coupling
Answer: (c).double-tuned transformer coupling
Question 82. Statement 1:
Diode is the most common device used for demodulation.
Statement 2:
A discriminator is a FM detector.
  1.    Statement 1 is true but statement 2 is false
  2.    Statement 1 is false but statement 2 is true
  3.    Both the statements are true
  4.    Both the statements are false
 Discuss Question
Answer: Option C. -> Both the statements are true
Answer: (c).Both the statements are true
Question 83. In a receiver, which of the following device has RF input but IF output?
  1.    Loudspeaker
  2.    Frequency changer
  3.    Demodulator
  4.    Audio amplifier
 Discuss Question
Answer: Option B. -> Frequency changer
Answer: (b).Frequency changer
Question 84. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of
  1.    Mf
  2.    Mf/2
  3.    2Mf
  4.    UMf
 Discuss Question
Answer: Option C. -> 2Mf
Answer: (c).2Mf
Question 85. Double spotting in a receiver is due to
  1.    poor sensitivity of RF amplifier
  2.    high gain of IF amplifier
  3.    inadequate image frequency rejection
  4.    all of the above
 Discuss Question
Answer: Option C. -> inadequate image frequency rejection
Answer: (c).inadequate image frequency rejection
Question 86. Transistor are free from which type of noise?
  1.    Resistance noise
  2.    Partition noise
  3.    Flicker noise
  4.    Shot noise
 Discuss Question
Answer: Option B. -> Partition noise
Answer: (b).Partition noise
Question 87. In a broadcast superheterodyne receiver
  1.    the local oscillator operates below the signal frequency
  2.    local oscillator frequency is normally double the IF
  3.    RF amplifier normally works at kHz above the carrier frequency
  4.    mixer input must be tuned to the signal frequency
 Discuss Question
Answer: Option D. -> mixer input must be tuned to the signal frequency
Answer: (d).mixer input must be tuned to the signal frequency
Question 88. Which of the following cannot be used to demodulate SSB?
  1.    Complete phase-shift generator
  2.    Product detector
  3.    Diode balanced modulator
  4.    Bipolar transistor balanced modulator
 Discuss Question
Answer: Option D. -> Bipolar transistor balanced modulator
Answer: (d).Bipolar transistor balanced modulator
Question 89. Standard AM radio broadcasts are confined to
  1.    MF
  2.    HF
  3.    VHF
  4.    UHF
 Discuss Question
Answer: Option A. -> MF
Answer: (a).MF
Question 90. In a radio receiver with simple AGC
  1.    the highest AGC voltage is produced between stations
  2.    the faster the AGC time constant, the more accurate the output
  3.    an increase in signal strength produces more AGC
  4.    the audio stage gain is normally controlled by AGC
 Discuss Question
Answer: Option C. -> an increase in signal strength produces more AGC
Answer: (c).an increase in signal strength produces more AGC

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