Electrical Machines
Which slots are used in the rotor of an induction motor?

  Open slots.
  None of above.
  Closed slots.
  Semi closed slots.

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 percentage impedance of all transformers must be same.
  polarities of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.
 voltage ratio of all transformers must be same.

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