(A) to project against’internal fault
(B) to reduce copper as well as core losses
(C) to cool the transformer oil
(D) to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
(A) to project against’internal fault
(B) to reduce copper as well as core losses
(C) to cool the transformer oil
(D) to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
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