DGVCL Exam Paper (11-12-2011)
It is difficult interrupt a capacitive current because

Stored energy in the capacitor is very high
Current magnitude is very small
It has a leading power factor
The restriking voltage can be high

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Amount of copper in the winding
Harmonics in the generated emf
Size of the machine
Cost of the machine

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

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

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