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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 15 of 17 pages
Question 141. 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.    1
  2.    16
  3.    8
  4.    15
 Discuss Question
Answer: Option D. -> 15
Question 142. 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.    Uncorrelated
  2.    Statistically independent
  3.    Correlated
  4.    Orthogonal
 Discuss Question
Answer: Option B. -> Statistically independent
Question 143. Which of the following is used to generate PDM?
  1.    Free running multi-vibrator
  2.    JK flip-flop
  3.    Schmitt trigger
  4.    Monostable multi-vibrator
 Discuss Question
Answer: Option D. -> Monostable multi-vibrator
Question 144. When the length of antenna is a whole wavelength
  1.    The radiation at right angles is maximum
  2.    The radiation at right angles is zero
  3.    The radiation is maximum in all directions
  4.    The radiation is zero in all directions
 Discuss Question
Answer: Option B. -> The radiation at right angles is zero
Question 145. For a low level AM system, the amplifiers modulated stage must be
  1.    Non-linear devices
  2.    Linear devices
  3.    Class C amplifiers
  4.    Harmonic devices
 Discuss Question
Answer: Option B. -> Linear devices
Question 146. In case of low level amplitude modulation system, the amplifiers following the modulated stage must be
  1.    Linear devices
  2.    Class C amplifiers
  3.    Harmonic devices
  4.    Non-linear devices
 Discuss Question
Answer: Option A. -> Linear devices
Question 147. 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.    80.9
  4.    70.2
 Discuss Question
Answer: Option B. -> 113
Question 148. 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 149. A cordless telephone using separate frequencies for transmission in base and portable units is known as
  1.    Duplex arrangement
  2.    Half duplex arrangement
  3.    Either A or B
  4.    Neither A nor B
 Discuss Question
Answer: Option A. -> Duplex arrangement
Question 150. 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

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