What is the purpose of a differential in a tractor?

The purpose of a differential in a tractor is to allow the wheels to rotate at different speeds while turning. When a vehicle, including a tractor, goes around a corner, the outside wheels must cover a greater distance than the inside wheels. A differential facilitates this by enabling the wheels on the same axle to turn at different speeds. This is critical for maintaining traction and stability during turns, as it helps prevent tire scrubbing and enhances overall maneuverability.

The other choices do not accurately reflect the role of a differential. Increasing fuel efficiency is influenced by other factors, such as the engine and transmission systems. Monitoring engine temperature is handled by the engine's cooling system and associated sensors, not the differential. Lastly, controlling hydraulic functions pertains to the hydraulic systems and components in a tractor, which are separate from the differential's function. Therefore, the correct understanding of a differential is its key role in providing differential speed to the wheels, facilitating smoother and more efficient turns.