To keep the exit pressures relatively constant across a HP turbine blade, which type of construction is generally utilized?

Correct Answer: Option B — Impulse-Reaction.

Impulse-reaction blading is utilized to maintain relatively constant pressure across the stage. By combining impulse and reaction principles, the design optimizes energy extraction while managing the pressure drop, which helps in balancing axial thrust loads and improving the overall thermal efficiency of the high-pressure turbine section.