Discussion
A machine with a large short circuit ratio has
Answer: D
Correct answer: good voltage regulation and a large fault current
The short circuit ratio is the reciprocal of the per unit synchronous reactance, so a large ratio means a small reactance. A small reactance means a small voltage drop on load, hence good regulation - and, by the same token, little to limit the current into a fault. The two consequences are inseparable, and machine design trades one against the other.
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