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

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

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Electrical Machines
With the increase in speed of a DC motor

 back emf increases but line current falls.
 both back emf as well as line current fall.
 back emf falls and line current increases.
 both back emf as well as line current increase.

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