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

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Electrical Machines
For an ideal transformer the winding should have

 no ohmic resistance on either side
 equal resistance on primary and secondary side
 maximum resistance on primary side and least resistance on secondary side
 minimum resistance on primary side and maximum resistance on secondary side

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