On the gas turbine shown in the illustration, which of the following best describes the main principle of operation of the component contained within the area labeled "C"? Illustration GT-0001

Correct Answer: Option C — Combustion at a constant pressure

The Brayton cycle, which governs gas turbine operation, relies on constant pressure combustion. In the combustion chamber, fuel is injected and burned at a relatively constant pressure, significantly increasing the gas temperature and volume before the high-energy gas expands through the turbine stages to produce mechanical work.