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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 6 of 17 pages
Question 51. In Pulse Code Modulation system
  1.    Large bandwidth is required
  2.    Quantising noise can be overcome by companding
  3.    Quantising noise can be reduced by decreasing the number of standard levels
  4.    Suffers from the disadvantage of its incompatibly with TDM
 Discuss Question
Answer: Option A. -> Large bandwidth is required
Question 52. An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
  1.    200 and 1.01
  2.    200 and 10.01
  3.    200 and 100.1
  4.    200 and 200
 Discuss Question
Answer: Option A. -> 200 and 1.01
Question 53. DVD uses
  1.    Laser beam for both recording and playback
  2.    Laser beam for recording and video head for playback
  3.    Video head for recording and laser beam for playback
  4.    None of the above
 Discuss Question
Answer: Option A. -> Laser beam for both recording and playback
Question 54. If output power of a radio receiver is doubled, its volume is increased by __________ dB.
  1.    2
  2.    3
  3.    1
  4.    -3
 Discuss Question
Answer: Option B. -> 3
Question 55. For attenuation of high frequencies we should use
  1.    Shunt capacitance
  2.    Series capacitance
  3.    Inductance
  4.    Resistance
 Discuss Question
Answer: Option A. -> Shunt capacitance
Question 56. The disadvantage of FM over AM is that
  1.    High output power is needed
  2.    High modulating power is needed
  3.    Noise is very high for high frequency
  4.    Large bandwidth is required
 Discuss Question
Answer: Option D. -> Large bandwidth is required
Question 57. VSB modulation is preferred in TV because
  1.    It reduces the bandwidth requirement to half
  2.    It avoids phase distortion at low frequencies
  3.    It results in better reception
  4.    None of the above
 Discuss Question
Answer: Option A. -> It reduces the bandwidth requirement to half
Question 58. Which one of the following is analog?
  1.    PCM
  2.    PWM
  3.    Delta modulation
  4.    Differential PCM
 Discuss Question
Answer: Option B. -> PWM
Question 59. As per Shannon-Hartley theorem, a noise less Gaussian channel has
  1.    Zero capacity
  2.    Infinite capacity
  3.    Small capacity
  4.    None of the above
 Discuss Question
Answer: Option B. -> Infinite capacity
Question 60. In a TV receiver antenna the length of reflector rod
  1.    Is the same as that of dipole
  2.    Is less than that of dipole
  3.    Is more than that of dipole
  4.    May be equal, more or less than that of dipole
 Discuss Question
Answer: Option C. -> Is more than that of dipole

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