Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  the generator runs on overload.
  there is no load on the generator.
  the generator runs on full load.

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

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

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