Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  breaking torque.
  power factor.
  starting torque.

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = negative number.

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