Which component provides the second stage of compression, combustion, and first stage of expansion?

• A. Axial Compressor Assembly
• B. Gas Generator High Pressure Section
• C. Power Turbine
• D. Reduction Gearbox

Answer: (B)

In a gas turbine engine, the flow path moves from compression to combustion and then to expansion through turbines, with the stages grouped in the gas generator. The part that handles the second stage of compression, then the burning of fuel, and the first stage of expansion is the gas generator high pressure section. This section contains the high‑pressure compressor, the combustor, and the high‑pressure turbine. The high‑pressure compressor provides the next level of compression beyond the initial stages, the combustor adds energy by burning fuel, and the high‑pressure turbine begins extracting energy to drive that compression. The power turbine and any reduction gearbox are located downstream from this core, delivering usable shaft power rather than performing the core compression–combustion–expansion sequence.