An engine governor is
- a mechanism that regulates the amount of fuel going to the engine.
- a mechanism that lets you start a vehicle without using the throttle.
- a speed controller.
- all of the above. ✓
Answer: D. all of the above.
An engine governor is all of the above: it regulates fuel to the engine, lets you start without using the throttle, and acts as a speed controller.
Why this is the answer
The handbook gives the governor several jobs in one description. It manages how much fuel reaches the engine and regulates engine speed. It also lets a vehicle get moving on flat ground or a slope with no throttle input. Because the passage presents these functions together, the choice that includes all of them is the accurate one. The fuel-efficient driving section also advises zero throttle when starting a heavy-duty diesel, which fits the governor's no-throttle starting role.
Why the other answers are wrong
- A. a mechanism that regulates the amount of fuel going to the engine. — Regulating fuel is only one function the handbook gives; a governor also regulates engine speed and allows starting without the throttle.
- B. a mechanism that lets you start a vehicle without using the throttle. — Starting without the throttle is only one function the handbook gives; a governor also regulates fuel and engine speed.
- C. a speed controller. — Acting as a speed controller is only one function the handbook gives; a governor also regulates fuel and allows starting without the throttle.
Remember it
Link governor to three jobs: fuel, speed, and getting moving without the throttle.