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ELECTRICAL MACHINES

Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
  residual magnetism.
  permanent magnets.
 armature reaction.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

  3600 A.
 2400 A.
 1200 A.
 600 A.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
 throughout the air gap.
 interpole region.
  region under main pole.

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Electrical Machines
Resistance commutation is used generally in case of

  fractional kW DC machines.
None of these
 DC machines above 10 kW.
 DC machines bellow 5 kW.

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
 if field resistance is more than critical resistance.
 any one of above.
  if it has lost residual magnetism.

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