Electrical Machines
Which of the following machine will have maximum efficiency?

 Induction motor.
 DC motor.
  Electrical power transformer.
 Electrical power generator.

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Electrical Machines
Cogging of induction motor occurs at

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

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