CPL Aircraft General Knowledge Practice Questions - CAASL Commercial Pilot License (CPL) Aircraft General Knowledge Examination Exam

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Which of the following describes the operating principle of a bootstrap air cycle machine (ACM) used in cabin conditioning?

Compressing air using an electrical pump and routing it through a cooling radiator Using a chemical absorbent to extract heat and moisture from the cabin inlet air Bleeding engine air through a heat exchanger, compressing it, cooling it, and expanding it through a turbine to extract energy Passing high-pressure bleed air over a liquid nitrogen cooling coil

Correct Answer:

Bleeding engine air through a heat exchanger, compressing it, cooling it, and expanding it through a turbine to extract energy

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