Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed demanding less armature current.
  Increase in speed but armature currnet remains the same.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.

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Electrical Machines
Flashing the field of DC generator means

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

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