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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 7 of 17 pages
Question 61. To eliminate ghosts in the picture
  1.    Use a longer transmission line
  2.    Connect a booster
  3.    Change the antenna orientation of location
  4.    Twist the transmission line
 Discuss Question
Answer: Option C. -> Change the antenna orientation of location
Question 62. Circular polarization
  1.    Is useful in reducing depolarization effect on received wave
  2.    Involves critical alignment of transmitting and receiving antenna
  3.    Is useful in discrimination between reception of adjacent beams
  4.    None of the above
 Discuss Question
Answer: Option A. -> Is useful in reducing depolarization effect on received wave
Question 63. If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.
  1.    5
  2.    4.9
  3.    995
  4.    10
 Discuss Question
Answer: Option D. -> 10
Question 64. In Modulation, “carrier” is
  1.    Resultant wave
  2.    Speech voltage to be transmitted
  3.    Voltage with constant frequency, phase or amplitude
  4.    Voltage for which frequency, phase or amplitude is varied
 Discuss Question
Answer: Option D. -> Voltage for which frequency, phase or amplitude is varied
Question 65. 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.    3E
  3.    4E
  4.    6E
 Discuss Question
Answer: Option C. -> 4E
Question 66. 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 67. In TV systems, equalising pulses are sent during
  1.    Horizontal blanking
  2.    Vertical blanking
  3.    Serrations
  4.    Horizontal retrace
 Discuss Question
Answer: Option A. -> Horizontal blanking
Question 68. For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
  1.    1
  2.    0.8
  3.    0.5
  4.    0
 Discuss Question
Answer: Option A. -> 1
Question 69. The maximum power output of a standard A earth station over the total band allocated to satellite communication is about
  1.    0.5 kW
  2.    8 kW
  3.    20 kW
  4.    50 kW
 Discuss Question
Answer: Option A. -> 0.5 kW
Question 70. The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
  1.    Gets halved
  2.    Gets doubled
  3.    Gets increased by 50 percent
  4.    Remains unchanged
 Discuss Question
Answer: Option C. -> Gets increased by 50 percent

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