Governors for diesel engines can be categorized into which two general classes?

Governors for diesel engines can indeed be categorized into two general classes: mechanical and hydraulic. Mechanical governors utilize centrifugal force to control the fuel supply to the engine, responding directly to engine speed changes. They are designed to maintain a specific engine speed by adjusting the fuel delivered based on the load and speed conditions.

On the other hand, hydraulic governors operate using hydraulic pressure to control the fuel flow. They tend to provide more precise regulation compared to mechanical governors, making them preferable in applications where stability and responsiveness are critical.

While other classifications, such as manual and automatic or hydraulic and pneumatic, exist in the broader context of control systems, they do not specifically relate to the common categorization of governors used in diesel engines. Therefore, the classification into mechanical and hydraulic accurately describes the core operational principles and functions of the governor types relevant to diesel engines.