Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 112.5 W
 168.75 W
 50 W
 75 W

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Electrical Machines
Flashing of DC generator means

 neutralization of residual magnetism.
None of these
  creation of residual magnetism by a DC source.
  increasing flux density by providing extra ampere-turns in field.

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