Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  None of above.
  Rheostatic control.
  Any of above method.
  Ward Leonard control.

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Electrical Machines
Flashing the field of DC generator means

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

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