DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper as well as iron loss
Low voltage
Low iron loss
Low copper loss

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

The demagnetizing effect of armature mmf
The reactance voltage
Both the cross-magnetizing mmf and the reactance voltage
The cross-magnetizing effect of armature mmf

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