Electrical Machines
In travelling cranes for swing action which motor is preferred?

  AC slip ring IM.
  Capacitor type induction motors.
  Reluctance motor.
  DC series motor.

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Electrical Machines
Compensating windings are used in DC generators

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

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