Electrical Machines
DC Motor

  dc shunt motor with field weakening.
  dc compound motor.
  dc shunt with armature resistance control.
  dc series motor.

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

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