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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 9 of 17 pages
Question 81. When the length of antenna is a whole wavelength
  1.    The radiation at right angles is zero
  2.    The radiation at right angles is maximum
  3.    The radiation is zero in all directions
  4.    The radiation is maximum in all directions
 Discuss Question
Answer: Option A. -> The radiation at right angles is zero
Question 82. Under ordinary circumstances, impulse noise can be reduced in
  1.    FM only
  2.    AM only
  3.    Both AM and FM
  4.    None of the above
 Discuss Question
Answer: Option A. -> FM only
Question 83. Which of the following is used to generate PDM?
  1.    Free running multi-vibrator
  2.    Monostable multi-vibrator
  3.    JK flip-flop
  4.    Schmitt trigger
 Discuss Question
Answer: Option B. -> Monostable multi-vibrator
Question 84. A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be
  1.    Correlated
  2.    Statistically independent
  3.    Uncorrelated
  4.    Orthogonal
 Discuss Question
Answer: Option B. -> Statistically independent
Question 85. A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is
  1.    16
  2.    15
  3.    8
  4.    1
 Discuss Question
Answer: Option B. -> 15
Question 86. For a low level AM system, the amplifiers modulated stage must be
  1.    Linear devices
  2.    Harmonic devices
  3.    Class C amplifiers
  4.    Non-linear devices
 Discuss Question
Answer: Option A. -> Linear devices
Question 87. In case of low level amplitude modulation system, the amplifiers following the modulated stage must be
  1.    Class C amplifiers
  2.    Linear devices
  3.    Non-linear devices
  4.    Harmonic devices
 Discuss Question
Answer: Option B. -> Linear devices
Question 88. Commercial Frequency deviation of FM is
  1.    70 kHz
  2.    75 kHz
  3.    80 kHz
  4.    65 kHz
 Discuss Question
Answer: Option B. -> 75 kHz
Question 89. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.
  1.    102.3
  2.    113
  3.    70.2
  4.    80.9
 Discuss Question
Answer: Option B. -> 113
Question 90. Skip distance depends on time of day and angle of incidence.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True

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