Discussion
Three of the following reduce transformer losses. The exception is
Answer: B
Correct answer: raising the load to the full nameplate rating
Loading a transformer to its full rating maximises the copper loss, since that grows with the square of the current, so it increases the losses rather than reducing them. The other three genuinely help: a low-loss core cuts the constant iron loss, consolidating two lightly loaded units removes one unit’s iron loss entirely, and correcting the power factor at the load reduces the current the transformer must carry.
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