Question 55Gas Turbine - Assistant Engineer

The correct answer is B) 13th stage compressor air. The HP turbine 2nd stage nozzle vanes in the GE LM2500 gas turbine engine are cooled by 13th stage compressor air. This is because the 13th stage of the compressor provides the highest pressure and temperature air within the engine, which is necessary to effectively cool the critical HP turbine nozzle vanes. The other answer choices are incorrect because frame vent bleed air (A) is not hot enough to provide adequate cooling, and the 16th stage (C) and 9th stage (D) compressor air does not have the required pressure and temperature characteristics to cool the HP turbine nozzle vanes.