Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Over-excitation.
  Small and constant load.
  Over-loading for long period.
  Periodic variation of load.

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Electrical Machines
In a star - delta starting of an IM

  resistance is inserted in the rotor.
  line voltage is 57.7 % of stator voltage.
  reduced voltage is applied to the stator.
  applied voltage per stator phase is 57.7 % of a line volt

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