In a gas turbine engine, turbine section.

• A. velocity increases and pressure decreases
• B. velocity decreases and pressure increases
• C. temperature decreases along with pressure and velocity
• D. temperature increases and pressure increases

Answer: (A)

In the turbine section, hot, high‑pressure gas expands and does work on the turbine blades. This expansion causes the static pressure of the gas to fall as energy is transferred from the gas to the rotor. The blade passages are shaped to accelerate the flow, so the gas velocity tends to increase as it passes through the turbine. While the overall gas temperature also drops because energy is being extracted, the key characteristic you’re looking for here is the combination of falling pressure with increasing flow velocity as the gas expands and transfers energy to the shaft.