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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.
 increases in both the generators and the motors with load.

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