Electrical Machines
Flashing of DC generator means

 neutralization of residual magnetism.
  increasing flux density by providing extra ampere-turns in field.
None of these
  creation of residual magnetism by a DC source.

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

 decrease in speed demanding less armature current.
 increase in speed but armature currnet remains the same.
 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.

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