What will be the frequency of a three-phase, 16 pole, AC generator operating at 3000 revolutions per minute?
Official USCG Answer & Rule Citation
Correct Answer: Option D — 400 hertz
Synchronous generator frequency is calculated using the formula f = (P * RPM) / 120. For a 16-pole machine running at 3000 RPM, frequency equals (16 * 3000) / 120 = 400 hertz, typical for specialized marine aviation or high-frequency distribution systems.
100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.