Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 throughout the air gap.
 interpole region.
None of these
  region under main pole.

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

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