The turbine rotor blade's primary function is to extract energy from expanding gases and transfer it to which component?

• A. The rotor disk
• B. The exhaust nozzle
• C. The fuel nozzle
• D. The ignitor plugs

Answer: (A)

The turbine rotor blades convert the energy of the expanding gases into mechanical energy, and they do this by being attached to the rotor disk. The rotor disk is the rotating hub that carries the blades and transmits the resulting torque to the engine shaft, which then drives the compressor and other accessories. So the energy from the turbine acts on the blades and is transferred to the rotor disk, which is the component that actually carries and delivers that energy to the rest of the engine.

The other components serve different roles: the exhaust nozzle shapes and speeds the exhaust gas to produce thrust, the fuel nozzle injects fuel for combustion, and ignitor plugs provide ignition. They are not the part that receives energy from the turbine blades.