Which component is responsible for transmitting power with speed reduction to the load?

• A. Power Turbine
• B. Gas Generator
• C. Axial Compressor
• D. Reduction Gearbox

Answer: (D)

Transmitting power to a load while changing its speed is the job of a reduction gearbox. It sits between the high-speed shaft coming from the turbine and the driven equipment (like a generator or mechanical drive) and lowers the rotational speed while increasing torque so the load can be driven effectively. Power remains roughly the same (minus small losses), so reducing speed results in higher torque according to P = T × ω. The other components have different roles: the gas generator powers the turbine system, the axial compressor handles air compression, and the power turbine converts energy of the hot gases into shaft power but does not inherently reduce speed for the load. The reduction gearbox is specifically designed to deliver power at a lower, usable speed to the load.