Governor sensitivity is determined by which factor related to the governor arm?

Governor sensitivity refers to the responsiveness of the governor to changes in engine speed. It is primarily influenced by the mechanical advantage provided by the length of the governor arm. A longer arm can provide greater leverage, which means that even a small movement can have a significant impact on the governor’s action to regulate engine speed. This mechanical leverage allows the governor to be more sensitive to changes, enabling it to maintain a more precise control of the engine’s performance.

In contrast, other factors such as the size of the engine, the type of governor used, and the fuel type being employed do not directly determine governor sensitivity. While these factors may influence overall engine performance or operational characteristics, they do not affect how the governor arm functions in terms of its sensitivity to speed changes. Thus, the mechanical advantage created by the arm length is the critical factor that determines governor sensitivity.