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MCQs

Total Questions : 377 | Page 6 of 38 pages
Question 51. In D.C. generators, current to the external circuit from armature is given through
  1.    Commutator
  2.    Solid connection
  3.    Slip rings
  4.    None of above
 Discuss Question
Answer: Option A. -> Commutator
Question 52. In a four-pole D.C. machine
  1.    All the four poles are north poles
  2.    Alternate poles are north and south
  3.    All the four poles are south poles
  4.    Two north poles follow two south poles
 Discuss Question
Answer: Option B. -> Alternate poles are north and south
Question 53. The voltage drop for which of the following types of brush can be expected to be least?
  1.    Graphite brushes
  2.    Carbon brushes
  3.    Metal graphite brushes
  4.    None of the above
 Discuss Question
Answer: Option C. -> Metal graphite brushes
Question 54. In a D.C. machine stray loss is the sum of
  1.    Total copper loss and mechanical loss
  2.    Armature copper loss and iron loss
  3.    Shunt field copper loss and mechanical loss
  4.    Iron loss and mechanical loss
 Discuss Question
Answer: Option D. -> Iron loss and mechanical loss
Question 55. Number of tapings for each equalizer ring is equal to
  1.    Number of pole pairs
  2.    Number of poles
  3.    Number of parallel paths
  4.    Number of commutator segments
 Discuss Question
Answer: Option A. -> Number of pole pairs
Question 56. The field coils of D.C. generator are usually made of
  1.    Mica
  2.    Copper
  3.    Cast iron
  4.    Carbon
 Discuss Question
Answer: Option B. -> Copper
Question 57. A cumulatively compounded long shunt generator when operating as a motor would be
  1.    Cumulatively compounded long shunt
  2.    Differentially compounded long shunt
  3.    Cumulatively compounded short shunt
  4.    Differentially compounded short shunt
 Discuss Question
Answer: Option B. -> Differentially compounded long shunt
Question 58. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be
  1.    270 V
  2.    267.5 V
  3.    265 V
  4.    257.4 V
 Discuss Question
Answer: Option B. -> 267.5 V
Question 59. If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
  1.    Demagnetization only
  2.    Cross magnetization as well as magnetization
  3.    Cross-magnetization as well as demagnetizing
  4.    Cross magnetization only
 Discuss Question
Answer: Option C. -> Cross-magnetization as well as demagnetizing
Question 60. Which of the following generators will be preferred if they are required to be run in parallel?
  1.    Shunt generators
  2.    Series generators
  3.    Compound generators
  4.    None of the above
 Discuss Question
Answer: Option A. -> Shunt generators

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