Discussion
The minimum of a V-curve corresponds to
Answer: A
Correct answer: unity power factor at that load
At the bottom of the V the armature current is the smallest that can carry the load, which means it is carrying real power only - no reactive component in either direction. Under-excited operation lies to the left, with lagging current, and over-excited to the right, with leading current, and both draw more current for the same power. Running at the minimum therefore gives the least armature copper loss.
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