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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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the armature connection must be reversed
 field winding must be excited by low voltage dc supply
 the field winding connection must be reversed
 the field winding must be replaced

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