Electrical Machines
If the flux of DC motor approaches zero, its speed will

 aprroach infinity.
 between zero and infinity.
 remain unchanged.
 approach zero.

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

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