D. C. Generators MCQs with answers Page - 8

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Admin • 831.35K Points
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Q. In D.C. generators the polarity of the interpoles

  • (A) is the same as that of the main pole ahead
  • (B) is the same as that of the immediately preceding pole
  • (C) is opposite to that of the main pole ahead
  • (D) is neutral as these poles do not play part in generating e.m.f.

A

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Q. The e.m.f. generated in a D.C. generator is directly proportional to

  • (A) flux/pole
  • (B) speed of armature
  • (C) number of poles
  • (D) all of the above

A

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Q. In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except

  • (A) interpoles
  • (B) dummy coils
  • (C) compensating winding
  • (D) shifting of axis of brushes

A

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Q. In D.C. generators on no-load, the air gap flux distribution in space is

  • (A) sinusoidal
  • (B) triangular
  • (C) pulsating
  • (D) flat topped

A

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Q. The purpose of providing dummy coils in a generator is

  • (A) to reduce eddy current losses
  • (B) to enhance flux density
  • (C) to amplify voltage
  • (D) to provide mechanical balance for the rotor

A

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Q. If a D.C. generator fails to build up the probable cause could not be

  • (A) imperfect brush contact
  • (B) field resistance less than the critical resistance
  • (C) no residual magnetism in the generator
  • (D) faulty shunt connections tending to reduce the residual magnetism

A

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Q. The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be

  • (A) 640 V
  • (B) 620 V
  • (C) 600 V
  • (D) 580 V

A

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Q. In a D.C. generator the critical resistance refers to the resistance of

  • (A) brushes
  • (B) field
  • (C) armature
  • (D) load

A

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Q. The rapid wear of brushes takes place due to

  • (A) abrasion from dust
  • (B) excessive spring pressure
  • (C) rough commutator bars
  • (D) all of the above factors

A

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Q. Number of tappings for each equilizer ring is equal to

  • (A) number of pole pairs
  • (B) number of poles
  • (C) number of parallel paths
  • (D) number of commutator segments

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