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MCQs

Total Questions : 130 | Page 4 of 13 pages
Question 31. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
  1.    2000 A
  2.    1500 A
  3.    1000 A
  4.    500 A
 Discuss Question
Answer: Option D. -> 500 A
Question 32. A rotary converter in general construction and design, is more or less like
  1.    a transformer
  2.    an induction motor
  3.    an alternator
  4.    any 'C. machine
 Discuss Question
Answer: Option D. -> any 'C. machine
Question 33. The applications of selenium rectifiers are usually limited to potential of
  1.    10 V
  2.    30 V
  3.    60 V
  4.    100 V
  5.    200 V
 Discuss Question
Answer: Option D. -> 100 V
Question 34. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
  1.    They are mechanically strong
  2.    They do not require any voltage for filament heating
  3.    Both (A) and (B)
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both (A) and (B)
Question 35. In a mercury arc rectifier characteristic blue luminosity is due to
  1.    colour of mercury
  2.    ionization
  3.    high temperature
  4.    electron streams
 Discuss Question
Answer: Option B. -> ionization
Question 36. Copper oxide rectifier is usually designed not to operate above
  1.    10°C
  2.    20°C
  3.    30°C
  4.    45°C
 Discuss Question
Answer: Option D. -> 45°C
Question 37. In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
  1.    maximum grid voltage
  2.    critical grid voltage
  3.    any of the above
  4.    none of the above
 Discuss Question
Answer: Option B. -> critical grid voltage
Question 38. Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of
  1.    100 A at 100 V
  2.    200 A at 200 V
  3.    300 A at 300 V
  4.    400 A at 400 V
  5.    500 A at 500 V
 Discuss Question
Answer: Option E. -> 500 A at 500 V
Question 39. Which of the following are the applications of D.C. system?
  1.    Battery charging work
  2.    Arc welding
  3.    Electrolytic and electro-chemical processes
  4.    Arc lamps for search lights
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 40. Which of the following AC. motors is usually used in large motor-generator sets?
  1.    Synchronous motor
  2.    Squirrel cage induction motor
  3.    Slip ring induction motor
  4.    Any of the above
 Discuss Question
Answer: Option A. -> Synchronous motor

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