Electrical Machines
Compensating windings are used in DC generators

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
With the increase in speed of DC motor

  Back emf increase but line current falls.
 Both back emf as well as line current fall.
 Back emf falls and line current increase.
 Both back emf as well as line current increase.

ANSWER DOWNLOAD EXAMIANS APP