D. C. Generators MCQs with answers Page - 2

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Q. Armature coil is short circuited by brushes when it lies

  • (A) along neutral axis
  • (B) along field axis
  • (C) in any of the above positions
  • (D) in none of the above positions

A

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Q. Armature reaction in a generator results in

  • (A) demagnetisation of leading pole tip and magnetisation of trailing pole tip
  • (B) demagnetisation of trailing pole tip and magnetisation of leading pole tip
  • (C) damagnetising the center of all poles
  • (D) magnetising the center of all poles

A

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Q. Armature reaction of an unsaturated D.C. machine is

  • (A) crossmagnetising
  • (B) demagnetising
  • (C) magnetising
  • (D) none of above

A

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Q. As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately

  • (A) 40 percent
  • (B) 25 percent
  • (C) 10 percent
  • (D) 5 percent

A

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Q. Brushes of D.C. machines are made of

  • (A) carbon
  • (B) soft copper
  • (C) hard copper
  • (D) all of above

A

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Q. Compensating windings are used in D.C. generators

  • (A) mainly to reduce the eddy currents by providing local short-circuits
  • (B) to provide path for the circulation of cooling air
  • (C) to neutralise the cross-magnetising effect of the armature reaction
  • (D) none of the above

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Q. Copper brushes in D.C. machine are used

  • (A) where low voltage and high currents are involved
  • (B) where high voltage and small cur-rents are involved
  • (C) in both of the above cases
  • (D) in none of the above cases

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Q. D.C. generator generally preferred for charging automobile batteries is

  • (A) series generator
  • (B) shunt generator
  • (C) long shunt compound generator
  • (D) any of the above

A

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Q. D.C. generators are connected to the busbars or disconnected from them only under the floating condition

  • (A) to avoid sudden loading of the primemover
  • (B) to avoid mechanicaljerk to the shaft
  • (C) to avoid burning of switch contacts
  • (D) all above

A

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Q. D.C. series generator is used

  • (A) to supply traction load
  • (B) to supply industrial load at constant voltage
  • (C) voltage at the toad end of the feeder
  • (D) for none of the above purpose

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