Electrical Machines
A smaller air gap in a induction motor helps to

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

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Electrical Machines
The compensating winding in a DC machine

 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes to avoid the sparking at the brushes.
  is located on pole shoes for avoiding the flashover at the commutator.
 is located on commutating poles for improving commutation.

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Electrical Machines
Armature reaction in a DC machine

 is in the same direction as the main poles.
 makes an angle with the main pole axis which is load dependent.
  makes an angle of 90° with the main pole axis.
 is in direct opposition to the main poles.

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