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

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

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  are provided on the stator for improving power factor.
  both (A) and (B).
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided in a synchronous motor to make it self starting.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.
 decrease in speed demanding less armature current.
 increase in speed demanding more armature current.

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