Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Around 100 %.
 Around 90 %
 Any where between 75 % and 90 %.

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Electrical Machines
Compensating windings are used in DC generators

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

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