Electrical Machines
In DC generator, lap winding is used in

 where greater load is connected.
 high voltage and low current applications.
  high current and low voltage applications.
 where constant speed is required.

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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.
 percentage impedance 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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