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MCQs

Total Questions : 100 | Page 8 of 10 pages
Question 71. A duplexer is a device used to
  1.    feed more than one receiver from a single antenna
  2.    connect two transmitters to the same antenna
  3.    connect a receiver and a transmitter to the same antenna
  4.    none of these
 Discuss Question
Answer: Option C. -> connect a receiver and a transmitter to the same antenna
Answer: (c).connect a receiver and a transmitter to the same antenna
Question 72. RF amplifiers are used in radio receivers for
  1.    improved image frequency rejection
  2.    improved rejection of adjacent unwanted signals
  3.    prevention of re-radiation of the local oscillator through the antenna of the receiver
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 73. The output of a diode detector contains
  1.    D.C. voltage
  2.    modulating signal
  3.    RF ripple
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 74. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10¯⁵ ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The input resistance of the detector is
  1.    114 kW
  2.    336 kW
  3.    384 kW
  4.    455 kW
 Discuss Question
Answer: Option B. -> 336 kW
Answer: (b).336 kW
Question 75. A heterodyne frequency changer is called a
  1.    Modulator
  2.    Mixer
  3.    Demodulator
  4.    Frequency translator
 Discuss Question
Answer: Option B. -> Mixer
Answer: (b).Mixer
Question 76. EM 84 tube is used in radio receivers as
  1.    audio amplifier
  2.    RF amplifier
  3.    full wave rectifier
  4.    magic eye
 Discuss Question
Answer: Option D. -> magic eye
Answer: (d).magic eye
Question 77. Modulated carrier power in FM
  1.    increases with modulating signal power
  2.    decreases with modulating signal power
  3.    is independent of the modulating signal power
  4.    none
 Discuss Question
Answer: Option C. -> is independent of the modulating signal power
Answer: (c).is independent of the modulating signal power
Question 78. FM receivers using the standard 88 to 108 MHz band use IF of
  1.    8 MHz
  2.    9.9 MHz
  3.    10.7 MHz
  4.    12.2 MHz
 Discuss Question
Answer: Option C. -> 10.7 MHz
Answer: (c).10.7 MHz
Question 79. Most of the amplification of the received signal is obtained in a superheterodyne receiver from the
  1.    IF stage
  2.    RF stage
  3.    power amplification stage
  4.    none of the above
 Discuss Question
Answer: Option A. -> IF stage
Answer: (a).IF stage
Question 80. Which of the following statement about receivers is false?
  1.    Double conversion is used to improve image rejection
  2.    Double conversion is used to improve selectivity
  3.    Variable sensitivity is used to improve selectivity
  4.    Variable sensitivity is used to eliminate selective fading
 Discuss Question
Answer: Option D. -> Variable sensitivity is used to eliminate selective fading
Answer: (d).Variable sensitivity is used to eliminate selective fading

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