Electrical Machines
Which of the following are variable losses?

 shunt field copper loss
 hysteresis loss
 armature copper loss
 eddy current loss

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Electrical Machines
Flashing the field of DC generator means

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

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