Electrical Machines
The DC compound motors are generally

 None of these.
 Cummulative compound.
 Differentical compound.
 Level Compound.

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

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