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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 11 of 17 pages
Question 101. A telephone channel requires a bandwidth of about
  1.    10 kHz
  2.    1 kHz
  3.    50 kHz
  4.    3 kHz
 Discuss Question
Answer: Option D. -> 3 kHz
Question 102. In practical commercial FM system, channel bandwidth is
  1.    108 MHz
  2.    88 MHz
  3.    100 kHz
  4.    150 kHz
 Discuss Question
Answer: Option D. -> 150 kHz
Question 103. Which of the following is an indirect way of generating FM?
  1.    Varactor diode modulator
  2.    Reactance FET modulator
  3.    Reactance bipolar transistor
  4.    Armstrong modulator
 Discuss Question
Answer: Option D. -> Armstrong modulator
Question 104. If sampling is done at the rate of 10 kHz. The bandwidth required is
  1.    35 kHz
  2.    1280 kHz
  3.    10 kHz
  4.    70 kHz
 Discuss Question
Answer: Option A. -> 35 kHz
Question 105. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
  1.    Improved efficiency
  2.    Better linearity
  3.    The lower modulating power requirement
  4.    High power output per transistor
 Discuss Question
Answer: Option C. -> The lower modulating power requirement
Question 106. For AM receivers the standard IF frequency is
  1.    10.7 MHz
  2.    106 kHz
  3.    455 kHz
  4.    1.07 MHz
 Discuss Question
Answer: Option C. -> 455 kHz
Question 107. Leak type bias is used in plate modulated class C amplifier to
  1.    Prevent excessive grid current
  2.    Prevent tuned circuit damping
  3.    Prevent over modulation
  4.    Increase the bandwidth
 Discuss Question
Answer: Option A. -> Prevent excessive grid current
Question 108. A modem is classified as low speed if data rate handled is
  1.    Upto 250 bps
  2.    Upto 600 bps
  3.    Upto 100 bps
  4.    Upto 400 bps
 Discuss Question
Answer: Option B. -> Upto 600 bps
Question 109. FM transmitting and receiving equipment as compared to AM equipment is
  1.    None of these
  2.    Almost equally costly
  3.    Cheaper
  4.    Costly
 Discuss Question
Answer: Option D. -> Costly
Question 110. If output power of a radio receiver is doubled, its volume is increased by __________ dB.
  1.    3
  2.    2
  3.    -3
  4.    1
 Discuss Question
Answer: Option A. -> 3

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