Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 steel core.
  winding conductors and steel structures of transformer.
 transformer insulating oil.

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

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