Discussion
If two paralleled transformers have unequal per unit impedances, they will
Answer: A
Correct answer: share the load in inverse proportion to those impedances
Paralleled transformers see the same terminal voltage, so the one with the lower impedance takes the larger share of current: the split is in inverse proportion to the per unit impedances. Unequal impedances therefore mean one unit reaches its rating before the other, and the pair cannot deliver the sum of their ratings.
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