Discussion
The synchronous impedance or emf method of predicting voltage regulation
Answer: B
Correct answer: gives a pessimistic result because it ignores saturation
The emf method takes the synchronous reactance from the unsaturated open circuit line, which overstates it, because in the real machine saturation reduces the flux that the armature mmf can add. Overstating the reactance overstates the voltage drop, so the calculated regulation is worse than the machine actually achieves.
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