Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 unity power factor.
 any of the above.
 lagging power factor.

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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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