Electrical Machines
Crawling in an induction motor is due to

  insufficient starting torque.
  space harmonics produced by winding currents.
  slip ring rotor.
  time harmonics in supply.

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Electrical Machines
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged, then

 both hysteresis loss(Ph) and eddy current loss(Pe) will increase
 Ph will decrease but Pe will remain same
 Ph will increase but Pe will decrease
 Pe will increase but Ph will decrease

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Electrical Machines
Compensating windings are used in DC generators

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

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