Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
 increases the design cost
All of these

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Electrical Machines
Flashing the field of DC generator means

  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.
 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.

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