Discussion
An inverted V-curve of a synchronous motor plots
Answer: B
Correct answer: power factor against field current at constant load
The power factor rises to unity as the excitation is increased to normal and falls again as the machine becomes over-excited, so the curve peaks in the middle and slopes away on both sides. That inverted V is the mirror of the ordinary V-curve of armature current, which reaches its minimum at the same point.
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