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

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An AC generator rated at 115/200 V, 3-phase, 400 Hz is driven by a Constant Speed Drive (CSD). If the engine speed increases from idle to takeoff thrust, what changes occur in the CSD and generator outputs?

The CSD output speed increases, increasing both the frequency and the output voltage of the generator The CSD adjusts its internal hydraulic ratio to keep generator speed and frequency constant at 400 Hz, while the voltage regulator keeps voltage constant The generator output frequency increases linearly with engine RPM, but the voltage is regulated to 115 V by the GCU The CSD disconnects the generator at high engine RPMs to prevent overfrequency and overvoltage conditions

Correct Answer:

The CSD adjusts its internal hydraulic ratio to keep generator speed and frequency constant at 400 Hz, while the voltage regulator keeps voltage constant

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