Which set lists only the components that are considered main components of a turbine drive train?

• A. Hub adapter, Shrink disk, Main bearings, Inductive sensors
• B. Gearbox, Hub adapter, Shrink disk, Flex Coupler
• C. Generator, Main shaft, Slip ring, PT 100
• D. Gearbox, Generator, Main shaft, Main bearings

Answer: (D)

The main idea is identifying the essential parts that actually transmit and convert the turbine’s rotational energy into usable electrical power. In a turbine drive train, the energy flows from the turbine through a shaft, through a gearbox to adjust speed and torque, and finally to the generator which converts mechanical energy into electricity. The supports that keep this rotating assembly aligned and rotating smoothly are the main bearings, which hold the shaft in place under high loads.

Seeing the components in that sequence helps explain why this set is correct: the gearbox, main shaft, main bearings, and the generator together cover the core functions of transmitting power, maintaining structural integrity, and converting energy. The other items listed—hub adapters, shrink disks, and flex couplers—are mounting or connection hardware; sensors like inductive sensors and PT100s are measurement devices; slip rings are for electrical connections in rotating systems. They are not part of the primary power-transmission path, so they aren’t considered main components of the drive train.