Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
 reduce chance of cogging.
  reduce magnetizing current.

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Electrical Machines
Compensating windings are used in DC generators

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

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