What are some uses of governors?
- To let you start your vehicle without using your throttle
- To regulate the amount of fuel going to the engine
- To control vehicle speed
- All of the above ✓
Answer: D. All of the above
All of these are uses of a governor: it limits the fuel going to the engine, controls speed, and lets you start without using the throttle.
Why this is the answer
The commercial driving handbook describes an engine governor as controlling how much fuel reaches the engine and regulating engine speed. It also says the governor lets you start a vehicle on level ground or on a grade without using the throttle. Another passage calls governors speed controllers that regulate fuel burned and engine rpm. Since the governor manages engine speed, its speed-control role covers controlling vehicle speed as well, so the combined answer is the one that fits the handbook.
Why the other answers are wrong
- A. To let you start your vehicle without using your throttle — Starting without using the throttle is a real governor function, but choosing only that leaves out its fuel-regulation and speed-control jobs.
- B. To regulate the amount of fuel going to the engine — Regulating fuel to the engine is a real governor function, but it is only part of what the handbook describes.
- C. To control vehicle speed — Controlling speed is part of the governor's job, but this choice alone does not include the fuel regulation and no-throttle starting uses.
Remember it
Picture the governor as the engine's speed and fuel manager that lets you pull away with your foot off the throttle.