Which component reduces the power turbine RPM and transfers power forward to the power output flange?

Which component reduces the power turbine RPM and transfers power forward to the power output flange?

• A. Gas generator
• B. Reduction gearbox
• C. Power turbine
• D. Generator

Answer: (B)

The key idea is that the high-speed energy from the turbine needs to be converted into a usable shaft speed for the output flange. The reduction gearbox does exactly that: it takes the very high RPM produced by the power turbine and gears it down to a slower, more usable speed while delivering torque to the power output flange. The gas generator drives the overall engine but isn’t what transfers power to the output shaft. The power turbine itself generates work, but its RPM is typically too high to drive the load directly without gearing. The generator is concerned with converting mechanical power to electricity, not providing the mechanical drive to the output flange.

The key idea is that the high-speed energy from the turbine needs to be converted into a usable shaft speed for the output flange. The reduction gearbox does exactly that: it takes the very high RPM produced by the power turbine and gears it down to a slower, more usable speed while delivering torque to the power output flange. The gas generator drives the overall engine but isn’t what transfers power to the output shaft. The power turbine itself generates work, but its RPM is typically too high to drive the load directly without gearing. The generator is concerned with converting mechanical power to electricity, not providing the mechanical drive to the output flange.