How is the turbine section of the JT15D engine described?

• A. A single-stage high-pressure turbine and a two-stage low-pressure turbine
• B. Two-stage high-pressure turbine and a single-stage low-pressure turbine
• C. Three-stage turbine with bleed air
• D. Four-stage turbine

Answer: (A)

The turbine section is described as a single-stage high-pressure turbine and a two-stage low-pressure turbine. In this two-spool setup, the high-pressure compressor is driven by one stage of turbine, while the low-pressure compressor is driven by two stages of turbine. That specific arrangement—one HP turbine stage and two LP turbine stages—matches the JT15D design. The other options would imply different stage counts (two-stage HP with single-stage LP, three-stage or four-stage turbines) which aren’t how this engine is built, and bleed air terminology doesn’t change the actual turbine stage configuration.