Question 98Gas Turbine - 1st Asst/Chief

The correct answer is B) Blade tips. The HP (high-pressure) turbine second stage blades are typically cooled by convection, with the cooling air being discharged at the blade tips. This allows the cooling air to flow over the blade surfaces, removing heat and helping to maintain the integrity of the blade structure under the high-temperature conditions encountered in the turbine. The other answer choices are incorrect because: A) Trailing edge slots are not the typical location for cooling air discharge, C) Gill holes on the side are not used for this purpose, and D) Nose holes on the leading edge would not effectively cool the blade surfaces.