Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 zero or very low voltage supply.
 high filed circuit resistance.
 over load.

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  none of them.
  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.

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