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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 13 of 17 pages
Question 121. In Modulation, “carrier” is
  1.    Voltage with constant frequency, phase or amplitude
  2.    Resultant wave
  3.    Speech voltage to be transmitted
  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 122. To eliminate ghosts in the picture
  1.    Use a longer transmission line
  2.    Twist the transmission line
  3.    Connect a booster
  4.    Change the antenna orientation of location
 Discuss Question
Answer: Option D. -> Change the antenna orientation of location
Question 123. Circular polarization
  1.    Is useful in reducing depolarization effect on received wave
  2.    Involves critical alignment of transmitting and receiving antenna
  3.    None of these
  4.    Is useful in discrimination between reception of adjacent beams
 Discuss Question
Answer: Option A. -> Is useful in reducing depolarization effect on received wave
Question 124. 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.    4.9
  2.    5
  3.    995
  4.    10
 Discuss Question
Answer: Option D. -> 10
Question 125. For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
  1.    1
  2.    0.5
  3.    0.8
 Discuss Question
Answer: Option A. -> 1
Question 126. 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 127. The modulation index of an FM is changed from 0 to 1. How does the transmitted power change?
  1.    Gets halved
  2.    Remains unchanged
  3.    Gets doubled
  4.    Gets increased by 50 percent
 Discuss Question
Answer: Option D. -> Gets increased by 50 percent
Question 128. 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 129. The maximum power output of a standard A earth station over the total band allocated to satellite communication is about
  1.    20 kW
  2.    0.5 kW
  3.    50 kW
  4.    8 kW
 Discuss Question
Answer: Option B. -> 0.5 kW
Question 130. For telegraphy the most commonly used modulation system is
  1.    PCM
  2.    FSK
  3.    Two tone modulation
  4.    Single tone modulation
 Discuss Question
Answer: Option B. -> FSK

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