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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 5 of 17 pages
Question 41. A telephone channel requires a bandwidth of about
  1.    1 kHz
  2.    3 kHz
  3.    10 kHz
  4.    50 kHz
 Discuss Question
Answer: Option B. -> 3 kHz
Question 42. Fourier analysis indicate that a square wave can be represented as
  1.    A fundamental sine wave and odd harmonics
  2.    A fundamental sine wave and even harmonics
  3.    A fundamental sine wave and harmonics
  4.    Fundamental and subharmonic sine waves
 Discuss Question
Answer: Option A. -> A fundamental sine wave and odd harmonics
Question 43. If sampling is done at the rate of 10 kHz. The bandwidth required is
  1.    35 kHz
  2.    70 kHz
  3.    10 kHz
  4.    1280 kHz
 Discuss Question
Answer: Option A. -> 35 kHz
Question 44. Which of the following is an indirect way of generating FM?
  1.    Armstrong modulator
  2.    Varactor diode modulator
  3.    Reactance FET modulator
  4.    Reactance bipolar transistor
 Discuss Question
Answer: Option A. -> Armstrong modulator
Question 45. In practical commercial FM system, channel bandwidth is
  1.    150 kHz
  2.    100 kHz
  3.    88 MHz
  4.    108 MHz
 Discuss Question
Answer: Option A. -> 150 kHz
Question 46. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
  1.    Improved efficiency
  2.    Better linearity
  3.    High power output per transistor
  4.    The lower modulating power requirement
 Discuss Question
Answer: Option D. -> The lower modulating power requirement
Question 47. Leak type bias is used in plate modulated class C amplifier to
  1.    Increase the bandwidth
  2.    Prevent over modulation
  3.    Prevent excessive grid current
  4.    Prevent tuned circuit damping
 Discuss Question
Answer: Option C. -> Prevent excessive grid current
Question 48. For AM receivers the standard IF frequency is
  1.    106 kHz
  2.    455 kHz
  3.    1.07 MHz
  4.    10.7 MHz
 Discuss Question
Answer: Option B. -> 455 kHz
Question 49. FM transmitting and receiving equipment as compared to AM equipment is
  1.    Costly
  2.    Cheaper
  3.    Almost equally costly
  4.    None of the above
 Discuss Question
Answer: Option A. -> Costly
Question 50. A modem is classified as low speed if data rate handled is
  1.    Upto 100 bps
  2.    Upto 250 bps
  3.    Upto 400 bps
  4.    Upto 600 bps
 Discuss Question
Answer: Option D. -> Upto 600 bps

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