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MCQs

Total Questions : 130 | Page 6 of 13 pages
Question 51. The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following
  1.    anode drop and cathode drop
  2.    anode drop and arc drop
  3.    cathode drop and arc drop
  4.    anode drop, cathode drop and arc drop
 Discuss Question
Answer: Option D. -> anode drop, cathode drop and arc drop
Question 52. In which of the following appUcations, direct current is absolutely essential ?
  1.    Illumination
  2.    Electrolysis
  3.    Variable speed operation
  4.    Traction
 Discuss Question
Answer: Option B. -> Electrolysis
Question 53. In phase-shift control method the control is carried out by varying the of grid voltage.
  1.    magnitude
  2.    polarity
  3.    phase
  4.    any of the above
  5.    none of the above
 Discuss Question
Answer: Option C. -> phase
Question 54. A mercury arc rectifier possesses ________ regulation characteristics
  1.    straight line
  2.    curved line
  3.    exponential
  4.    none of the above
 Discuss Question
Answer: Option D. -> none of the above
Question 55. The ionization potential of mercury is approximately
  1.    5.4 V
  2.    8.4 V
  3.    10.4 V
  4.    16.4 V
 Discuss Question
Answer: Option C. -> 10.4 V
Question 56. Selenium rectifier can be operated at temperatures as high as
  1.    25°C
  2.    40°C
  3.    60°C
  4.    75°C
 Discuss Question
Answer: Option D. -> 75°C
Question 57. Which of the following is reversible in action?
  1.    Motor generator set
  2.    Motor converter
  3.    Rotary converter
  4.    Any of the above
  5.    None of the above
 Discuss Question
Answer: Option C. -> Rotary converter
Question 58. A rotary converter operates at a
  1.    low power factor
  2.    high power factor
  3.    zero power factor
  4.    none of the above
 Discuss Question
Answer: Option B. -> high power factor
Question 59. A rotary converter can be started
  1.    from dc side as dc motor
  2.    from ac side as induction motor
  3.    by means of a small auxiliary motor
  4.    any of the above methods
 Discuss Question
Answer: Option D. -> any of the above methods


any of the above methods


Question 60. When a rotor converter is started by means of a small auxiliary motor, the power of motor must be
  1.    more than the dc output of converter
  2.    more than ac input of converter
  3.    half of dc output of converter
  4.    slightly more than the value of friction and windage losses at rated speed
 Discuss Question
Answer: Option D. -> slightly more than the value of friction and windage losses at rated speed


slightly more than the value of friction and windage losses at rated speed


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