Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
None of these
 dynamically and statically induced emf.
 statically induced emf.

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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 must be replaced
 the field winding connection must be reversed

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