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

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

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Connecting an additional resistance in stator circuit.
 Connecting an additional resistance in the field circuit.
 Any of the above.
 Connecting an additional resistance in the armature circuit.

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