Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
 tertiary winding.
  common winding.
 damping winding.

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Electrical Machines
Flashing of DC generator means

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

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