Question 102Gas Turbine - 1st Asst/Chief

The correct answer is C) 13th stage compressor air. In a marine gas turbine engine, the high-pressure (HP) turbine 2nd stage nozzle vanes are cooled by the 13th stage compressor air. This is because the 13th stage compressor air has a higher pressure and temperature compared to the lower stages, making it suitable for cooling the critical HP turbine components that experience high temperatures during engine operation. The other answer choices, such as frame vent bleed air (A) or air from the 9th (B) or 16th (D) stages, would not provide sufficient cooling for the HP turbine 2nd stage nozzle vanes.