Red Seal Agricultural Equipment Technician Practice Exam

What is the primary function of a governor in an engine?

1. To increase the engine's horsepower

2. To control the engine speed

3. To reduce fuel consumption

4. To enhance engine cooling

The correct answer is: To control the engine speed

The primary function of a governor in an engine is to control the engine speed. This device regulates the amount of fuel supplied to the engine, ensuring it maintains a predetermined speed regardless of the load or demand placed upon it. When the engine is under increased load, it tends to slow down. The governor responds to this change by adjusting the fuel flow to maintain the desired speed. Conversely, if the load decreases and the engine begins to speed up, the governor will reduce the fuel supply to prevent over-speeding. This regulation is crucial for both the efficiency of the engine and its longevity, as it prevents potential damage caused by excessive RPMs. While components that increase horsepower, reduce fuel consumption, or enhance cooling are important in engine performance, they are not the primary role of a governor. The main focus of this device is speed control, making it an essential element in various applications, particularly in agricultural equipment and machinery.