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MCQs

Total Questions : 130 | Page 12 of 13 pages
Question 111. In a single phase rotary converter the number of slip rings will be
  1.    Three
  2.    Two
  3.    Four
  4.    Six
 Discuss Question
Answer: Option B. -> Two
Question 112. A rotary converter combines the function of
  1.    an induction motor and a D.C. generator
  2.    Both of the listed here
  3.    None of the listed here
  4.    a synchronous motor and a D.C. generator
 Discuss Question
Answer: Option D. -> a synchronous motor and a D.C. generator
Question 113. In a three-phase mercury arc rectifiers each anode conducts for
  1.    One-fourth of a cycle
  2.    One-half a cycle
  3.    Two-third of a cycle
  4.    One-third of a cycle
 Discuss Question
Answer: Option D. -> One-third of a cycle
Question 114. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?
  1.    Selenium rectifiers
  2.    Mechanical rectifiers
  3.    Copper oxide rectifiers
  4.    Electrolytic rectifiers
 Discuss Question
Answer: Option D. -> Electrolytic rectifiers
Question 115. The efficiency of the copper oxide rectifier seldom exceeds
  1.    85 to 90%
  2.    80 to 85%
  3.    90 to 95%
  4.    65 to 75%
 Discuss Question
Answer: Option D. -> 65 to 75%
Question 116. The applications of selenium rectifiers are usually limited to potential of
  1.    100 V
  2.    20 V
  3.    10 V
  4.    30 V
 Discuss Question
Answer: Option A. -> 100 V
Question 117. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
  1.    1500 A
  2.    500 A
  3.    2000 A
  4.    200 A
 Discuss Question
Answer: Option B. -> 500 A
Question 118. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be
  1.    More
  2.    None of the listed here
  3.    Remain same
  4.    Less
 Discuss Question
Answer: Option D. -> Less
Question 119. In a mercury arc rectifier characteristic blue luminosity is due to
  1.    colour of mercury
  2.    high temperature
  3.    electron streams
  4.    ionization
 Discuss Question
Answer: Option D. -> ionization
Question 120. Which of the following AC. motors is usually used in large motor-generator sets?
  1.    Slip ring induction motor
  2.    Synchronous motor
  3.    Any of the listed here
  4.    Squirrel cage induction motor
 Discuss Question
Answer: Option B. -> Synchronous motor

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