Which component transforms gas energy into mechanical power to drive the reduction gearbox?

• A. Axial Compressor
• B. Gas Generator
• C. Transmission Shaft
• D. Power Turbine

Answer: (D)

The power turbine is the part that converts the energy of the hot, expanding gases into rotational shaft power to drive the reduction gearbox. It spins as the high-energy gases push its blades, and this rotation is transmitted through a shaft to the gearbox, which then reduces speed and increases torque for the load. The axial compressor presses incoming air, and the gas generator (compressor plus combustor) creates the high-energy gas, but they don’t deliver the shaft power to drive the gearbox. The transmission shaft simply carries the produced power from the turbine to the gearbox.