Electrical Machines
Cogging of induction motor occurs at

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

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Electrical Machines
DC Motor

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

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