Discussion
Two identical synchronous motors carry the same load, one over-excited and one under-excited. The over-excited machine draws
Answer: D
Correct answer: a leading current of similar magnitude
Both machines carry the same load, so both draw the same real current; the difference is in the reactive component. The under-excited machine takes lagging reactive current from the supply and the over-excited machine supplies it, so their currents are of similar size but on opposite sides of unity power factor.
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