Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and direct axis
 quadrature axis and interpolar axis
 direct axis and indirect axis
 direct axis and interpolar axis

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

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

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