Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
  It will run in opposite direction.
 motor will become slow.
 It will run in same direction.

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Electrical Machines
Cogging of induction motor occurs at

 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.
 low voltage and when stator and rotor poles are equal.
 high voltage and when stator and rotor poles are equal.

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