What component drives the governor in a turbine engine?

The governor in a turbine engine is primarily driven by the engine's high-speed rotor. This component is crucial for controlling the fuel flow to the engine and thereby managing the engine's speed and power output. The high-speed rotor's rotational speed generates the necessary forces and signals that the governor uses to maintain optimal operating conditions.

As the rotor speed increases or decreases, the governor adjusts the fuel control system to either increase or decrease fuel flow, ensuring that the engine operates within its design parameters. This balance is vital for maintaining efficiency and preventing potential damage to the engine due to overspeeding or underspeeding.

While the other options relate to the turbine engine's operation, they do not directly influence the governor in the same critical way that the rotor does. The cooling system helps regulate the engine's temperature, but it does not interact with the governor. The fuel control system is a mechanism that the governor influences but is not the driving component itself. Lastly, while exhaust gas flow is important for overall engine performance and efficiency, it does not directly drive the governor. The integral relationship between the high-speed rotor and the governor is essential for proper engine management and performance.