DGVCL Exam Paper (11-12-2011)
In the protection of transformers, harmonic restraint is used to guard against

Lightning
Magnetizing inrush current
Switching over voltages
Unbalanced protection

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

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

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