AMT Aviation Maintenance Technician Exam

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In a typical large transport aircraft AC electrical system, what is the primary purpose of a Constant Speed Drive (CSD) unit?

To convert variable engine RPM into a constant generator speed. To rectify AC voltage to DC voltage for the battery bus. To increase the output voltage of the generator during high-demand periods. To act as a circuit breaker in the event of a generator fault.

Correct Answer:

To convert variable engine RPM into a constant generator speed.

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