Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
None of these
 increase.
 remains constant.

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Electrical Machines
Compensating windings are used in DC generators

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

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