Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 None of above.
  Increases.
 Decreases.
 Remains unchanged.

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

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

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