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MCQs

Total Questions : 130 | Page 7 of 13 pages
Question 61. In a rotary converter
  1.    armature currents are dc only
  2.    armature currents are ac only
  3.    partly ac and partly dc
  4.    All of the above
 Discuss Question
Answer: Option C. -> partly ac and partly dc


partly ac and partly dc


Question 62. In a rotary converter l2R? losses as compared to a dc generator of the same size will be
  1.    four times more
  2.    double
  3.    same
  4.    less
 Discuss Question
Answer: Option D. -> less


less


Question 63. In a synchronous converter, the l2R losses are less as compared to dc generator of the same size because
  1.    dc currents are negligible
  2.    ac components neutralize the dc
  3.    cyclic fluctuations have low frequency
  4.    operating speed is low
 Discuss Question
Answer: Option B. -> ac components neutralize the dc


ac components neutralize the dc


Question 64. The average life of the glass bulb rectifier is
  1.    100 to 150 hours
  2.    1000 to 1500 hours
  3.    10,000 to 15,000 hours
  4.    100,000 to 150,000 hours
 Discuss Question
Answer: Option C. -> 10,000 to 15,000 hours


10,000 to 15,000 hours


Question 65. In mercury arc rectifier, voltage drop at anode is due to
  1.    energy spent in overcoming the electrostatic field
  2.    high temperature inside the rectifier
  3.    self-restoring property of mercury
  4.    high ionization potential
 Discuss Question
Answer: Option A. -> energy spent in overcoming the electrostatic field


energy spent in overcoming the electrostatic field


Question 66. In a mercury arc rectifier the cathode voltage drop is due to
  1.    surface resistance
  2.    expenditure of energy in liberating electrons from the mercury
  3.    expenditure of energy in ionization
  4.    expenditure of energy in overcoming the electrostatic field
 Discuss Question
Answer: Option B. -> expenditure of energy in liberating electrons from the mercury


expenditure of energy in liberating electrons from the mercury


Question 67. Least undulating current will be delivered by which mercury arc rectifier
  1.    1-phase
  2.    2 phase
  3.    3 phase
  4.    6 phase
 Discuss Question
Answer: Option D. -> 6 phase


6 phase


Question 68. Ionization potential of mercury is approximately
  1.    1 V
  2.    2 V
  3.    10.4 V
  4.    104 V
 Discuss Question
Answer: Option C. -> 10.4 V


10.4 V


Question 69. In arc rectifiers mercury is chosen as the liquid for rectifier because
  1.    it has low specific heat
  2.    it has low ionization potential
  3.    it has high atomic weight
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above


all of the above


Question 70. Maximum current rating of a glass bulb mercury arc rectifier is usually restricted to
  1.    50 A
  2.    100 A
  3.    500 A
  4.    1000 A
 Discuss Question
Answer: Option C. -> 500 A


500 A


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