Electrical Machines
In shapers and slotters which motor are preferred?

  Squirrel cage IM.
  Slip ring IM.
  Double cage motor.
  Synchronous motor.

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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.
 low voltage and when stator and rotor poles are equal.
 high voltage and when stator and rotor poles are equal.

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