FAA Powerplant Written Practice Test 2025 – Complete Exam Prep

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Question: 1 / 1165

What drives accessories such as electric generators on turbine powered aircraft?

High pressure compressor directly

Low pressure compressor directly

Reduction gearbox from the high pressure compressor

In turbine-powered aircraft, accessories like electric generators are typically driven through a reduction gearbox connected to the high-pressure compressor. This gearbox allows the electric generator to operate at its optimal speed, often much lower than the rotational speed of the high-pressure compressor.

This setup is efficient as it provides a constant and reliable source of mechanical power to the generator, regardless of the varying operational conditions of the engine. The high-pressure compressor operates at high RPMs, and using a reduction gearbox makes it feasible to power accessories without compromising their functional integrity.

The other options do not align with how power is usually transmitted to these accessories; therefore, they are not practical solutions for driving generators in turbine engines.

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Directly from the turbine exhaust

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