Discussion
Assertion: a one ampere secondary is preferred to a five ampere secondary in a large substation. Reason: the burden imposed by the connecting leads falls by a factor of twenty-five.
Answer: A
Lead burden is proportional to the square of the secondary current, so a fivefold reduction in current reduces it twenty-five-fold. In a large station where the instruments are far away that is the decisive consideration, and it is the reason given.
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