Discussion
True or false: a synchronous generator's speed determines the frequency it produces.
Answer: B
Correct answer: True, through the speed and the number of poles together
\[ f = \frac{PN}{120}. \] The speed alone is not enough, since the pole number must be known, but the two together fix the frequency exactly. This is why frequency control on a power system is speed control, and why the generators of an interconnected system all turn in step.
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