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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 12 of 17 pages
Question 111. DVD uses
  1.    Laser beam for recording and video head for playback
  2.    None of these
  3.    Video head for recording and laser beam for playback
  4.    Laser beam for both recording and playback
 Discuss Question
Answer: Option D. -> Laser beam for both recording and playback
Question 112. For attenuation of high frequencies we should use
  1.    Series capacitance
  2.    Inductance
  3.    Shunt capacitance
  4.    Resistance
 Discuss Question
Answer: Option C. -> Shunt capacitance
Question 113. In Pulse Code Modulation system
  1.    Quantising noise can be overcome by companding
  2.    Quantising noise can be reduced by decreasing the number of standard levels
  3.    Large bandwidth is required
  4.    Suffers from the disadvantage of its incompatibly with TDM
 Discuss Question
Answer: Option C. -> Large bandwidth is required
Question 114. 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 200
  2.    200 and 10.01
  3.    200 and 100.1
  4.    200 and 1.01
 Discuss Question
Answer: Option D. -> 200 and 1.01
Question 115. In a TV receiver antenna the length of reflector rod
  1.    Is more than that of dipole
  2.    Is the same as that of dipole
  3.    Is less than that of dipole
  4.    May be equal, more or less than that of dipole
 Discuss Question
Answer: Option A. -> Is more than that of dipole
Question 116. The disadvantage of FM over AM is that
  1.    Large bandwidth is required
  2.    High modulating power is needed
  3.    Noise is very high for high frequency
  4.    High output power is needed
 Discuss Question
Answer: Option A. -> Large bandwidth is required
Question 117. As per Shannon-Hartley theorem, a noise less Gaussian channel has
  1.    None of these
  2.    Infinite capacity
  3.    Small capacity
  4.    Zero capacity
 Discuss Question
Answer: Option B. -> Infinite capacity
Question 118. VSB modulation is preferred in TV because
  1.    None of these
  2.    It results in better reception
  3.    It avoids phase distortion at low frequencies
  4.    It reduces the bandwidth requirement to half
 Discuss Question
Answer: Option D. -> It reduces the bandwidth requirement to half
Question 119. Which one of the following is analog?
  1.    PCM
  2.    Differential PCM
  3.    PWM
  4.    Delta modulation
 Discuss Question
Answer: Option C. -> PWM
Question 120. For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
  1.    2E
  2.    6E
  3.    4E
  4.    3E
 Discuss Question
Answer: Option C. -> 4E

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