In an air vane governor, air pressure against the air vane tends to do what?

In an air vane governor, air pressure against the air vane plays a crucial role in regulating the engine's throttle position. When the engine speed increases, the airflow also increases, causing more air pressure against the vane. This pressure pushes the air vane in a direction that effectively closes the throttle. The governor's primary function is to maintain a consistent engine speed by adjusting the throttle position in response to changing load conditions. When the air pressure acts on the vane, it ensures that the engine does not exceed a certain speed, thus preventing over-revving. This mechanism helps maintain optimal performance and protects the engine from damage due to excessive RPMs. Therefore, the correct response to the question is that the air pressure against the air vane tends to close the throttle.