Electrical Machines
In travelling cranes for swing action which motor is preferred?

  Reluctance motor.
  AC slip ring IM.
  DC series motor.
  Capacitor type induction motors.

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Electrical Machines
Cogging of induction motor occurs at

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

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