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MCQs

Total Questions : 100 | Page 7 of 10 pages
Question 61. Selectivity varies with receiving frequency, frequency is raised.
  1.    Somewhat better when the receiving frequency is raised
  2.    Somewhat better at intermediate frequency
  3.    Somewhat worse when the receiving frequency is lowered
  4.    Somewhat worse when the receiving frequency is raised
 Discuss Question
Answer: Option D. -> Somewhat worse when the receiving frequency is raised
Answer: (d).Somewhat worse when the receiving frequency is raised
Question 62. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
  1.    facilitate tracking
  2.    allow permit adequate frequency coverage without switching
  3.    facilitate image frequency rejection
  4.    all of the above
 Discuss Question
Answer: Option B. -> allow permit adequate frequency coverage without switching
Answer: (b).allow permit adequate frequency coverage without switching
Question 63. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is
  1.    5870
  2.    3655
  3.    236
  4.    13.3
 Discuss Question
Answer: Option C. -> 236
Answer: (c).236
Question 64. A padder is basically a/an
  1.    insulator
  2.    variable resistor
  3.    capacitor
  4.    inductor
 Discuss Question
Answer: Option D. -> inductor
Answer: (d).inductor
Question 65. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
  1.    555 kHz
  2.    1010 kHz
  3.    1465 kHz
  4.    1920 kHz
 Discuss Question
Answer: Option C. -> 1465 kHz
Answer: (c).1465 kHz
Question 66. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 25 MHz will be
  1.    24.09 MHz
  2.    24.54 MHz
  3.    25.45 MHz
  4.    25.91 MHz
 Discuss Question
Answer: Option D. -> 25.91 MHz
Answer: (d).25.91 MHz
Question 67. In a receiver, which of the following device has IF input but RF output?
  1.    Demodulator
  2.    Loudspeaker
  3.    Audio amplifier
  4.    Frequency changer
 Discuss Question
Answer: Option A. -> Demodulator
Answer: (a).Demodulator
Question 68. In a radio receiver, if the intermediate frequency is too high
  1.    Selectivity will be poor
  2.    Tracking difficulties will be least
  3.    Adjacent channel rejection will improve
  4.    All of the above will occur
 Discuss Question
Answer: Option A. -> Selectivity will be poor
Answer: (a).Selectivity will be poor
Question 69. The noise produced by a resistor is proportional to
  1.    absolute temperature
  2.    (absolute temperature)²
  3.    1/absolute temperature
  4.    1/√absolute temperature
 Discuss Question
Answer: Option A. -> absolute temperature
Answer: (a).absolute temperature
Question 70. In a communication system, noise is most likely to affect the signal
  1.    at the transmitter
  2.    in the channel
  3.    in the information source
  4.    at the destination
 Discuss Question
Answer: Option B. -> in the channel
Answer: (b).in the channel

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