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MCQs

Total Questions : 130 | Page 13 of 13 pages
Question 121. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
  1.    Both of the listed here
  2.    They are mechanically strong
  3.    None of the listed here
  4.    They do not require any voltage for filament heating
 Discuss Question
Answer: Option A. -> Both of the listed here
Question 122. Which of the following are the applications of D.C. system?
  1.    Electrolytic and electro-chemical processes
  2.    All of the listed here
  3.    Arc welding
  4.    Battery charging work
 Discuss Question
Answer: Option B. -> All of the listed here
Question 123. Copper oxide rectifier is usually designed not to operate above
  1.    75°C
  2.    45°C
  3.    30°C
  4.    55°C
 Discuss Question
Answer: Option C. -> 30°C
Question 124. 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.    critical grid voltage
  2.    all of the listed here
  3.    maximum grid voltage
  4.    non of the listed here
 Discuss Question
Answer: Option A. -> critical grid voltage
Question 125. The advantage of mercury arc rectifier is that
  1.    All of the listed here
  2.    it has high efficiency
  3.    it is comparatively noiseless
  4.    it is light in weight and occupies small floor space
 Discuss Question
Answer: Option A. -> All of the listed here
Question 126. The metal rectifiers, as compared to mercury arc rectifiers
  1.    operate on low temperatures
  2.    give poor regulation
  3.    can operate on high voltages
  4.    can operate on heavy loads
 Discuss Question
Answer: Option A. -> operate on low temperatures
Question 127. In a mercury arc rectifier positive ions are attracted towards
  1.    shell bottom
  2.    mercury pool
  3.    cathode
  4.    anode
 Discuss Question
Answer: Option C. -> cathode
Question 128. Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of
  1.    300 A at 300 V
  2.    100 A at 100 V
  3.    400 A at 400 V
  4.    500 A at 500 V
 Discuss Question
Answer: Option D. -> 500 A at 500 V
Question 129. The potential drop in the arc, in a mercury arc rectifier, varies
  1.    none of the listed here
  2.    0.5 V to 1.5 V per cm length of the arc
  3.    0.05 V to 0.2 V per cm length of the arc
  4.    2 V to 3.5 V per cm length of the arc
 Discuss Question
Answer: Option A. -> none of the listed here
Question 130. In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
  1.    30, 60
  2.    75, 85
  3.    20, 30
  4.    40, 50
 Discuss Question
Answer: Option B. -> 75, 85

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