Discussion
The open circuit characteristic of a synchronous generator plots
Answer: A
Correct answer: terminal voltage against field current at rated speed
The open circuit characteristic is the machine’s magnetisation curve: driven at rated speed with no load, the terminal voltage is recorded as the field current is raised. It rises linearly at first along the air gap line, then bends over as the iron saturates, and it is that bend which makes the choice of regulation method matter.
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