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

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

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Electrical Machines
Compensating windings are used in DC generators

  to neutralize the cross magnetizing effect of the armature reaction.
  to provide path for the circulation of cooling air.
None of these
  mainly to reduce the eddy currents by providing local short circuit.

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