ATPL Aircraft General Knowledge Practice Questions - Sri Lanka CAA ATPL(A) Aircraft General Knowledge Examination Exam

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A 6-pole brushless AC generator is installed on an auxiliary power unit (APU). To maintain a constant output frequency of 400 Hz, what must be the rotational speed of the generator rotor?

12,000 RPM 8,000 RPM 6,000 RPM 24,000 RPM

Correct Answer:

8,000 RPM

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