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MCQs

Total Questions : 631 | Page 4 of 64 pages
Question 31. A transformer can have zero voltage regulation at
  1.    leading power factor
  2.    lagging power factor
  3.    unity power factor
  4.    zero power factor
 Discuss Question
Answer: Option A. -> leading power factor
Question 32. The 'cogging' of an induction motor can be avoided by
  1.    proper ventilation
  2.    using DOL starter
  3.    auto-transformer starter
  4.    having number of rotor slots more or less than the number of stator slots (not equal)
 Discuss Question
Answer: Option D. -> having number of rotor slots more or less than the number of stator slots (not equal)
Question 33. The secondary of a current transformer is always short-circuited under operating conditions because it
  1.    avoids core saturation and high voltage induction
  2.    is safe to human beings
  3.    protects the primary circuit
  4.    none of the above
 Discuss Question
Answer: Option A. -> avoids core saturation and high voltage induction
Question 34. Which of the following is not a part of transformer installation?
  1.    Conservator
  2.    Breather
  3.    Buchholz relay
  4.    Exciter
 Discuss Question
Answer: Option D. -> Exciter
Question 35. Which winding of the transformer has less cross-sectional area?
  1.    Primary winding
  2.    Secondary winding
  3.    Low voltage winding
  4.    High voltage winding
 Discuss Question
Answer: Option D. -> High voltage winding
Question 36. The complete circle diagram of induetion motor can be drawn with the help of data found from
  1.    noload test
  2.    blocked rotor test
  3.    stator resistance test
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 37. A common method of cooling a power transformer is
  1.    natural air cooling
  2.    air blast cooling
  3.    oil cooling
  4.    any of the above
 Discuss Question
Answer: Option C. -> oil cooling
Question 38. An open-circuit test on a transformer is conducted primarily to measure
  1.    insulation resistance
  2.    copper loss
  3.    core loss
  4.    total loss
 Discuss Question
Answer: Option C. -> core loss
Question 39. The voltage transformation ratio of a transformer is equal to the ratio of
  1.    primary turns to secondary turns
  2.    secondary current to primary current
  3.    secondary induced e.m.f. to primary induced e.m.f.
  4.    secondary terminal voltage to primary applied voltage
 Discuss Question
Answer: Option C. -> secondary induced e.m.f. to primary induced e.m.f.
Question 40. In a transformer the energy is conveyed from primary to secondary
  1.    through cooling coil
  2.    through air
  3.    by the flux
  4.    none of the above
 Discuss Question
Answer: Option C. -> by the flux

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