Electrical Machines
The use of higher flux density in the transformer design

 reduces the weigh per KVA
 increases the weigh per KVA
None of these
 has no relation with the weight of transformer

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Poles should contain residual flux.
 Field winding should be properly connected to armature winding.
All of these
 Field winding resistance should be less than critical resistance.

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

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

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