DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Trapping power frequency waves
Tripping fault current
All of these
Trapping high frequency waves entering into generator/transformer unit.

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

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

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