Discussion
As the field current of a loaded synchronous motor is raised from a very low value, the armature current
Answer: C
Correct answer: falls to a minimum and then rises again
This is the V-curve. Under-excited, the machine draws a lagging magnetising current from the supply; over-excited, it draws a leading one. Between them lies normal excitation, where the machine supplies its own magnetising requirement and the armature current is at its minimum, all of it real.
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