CDL · Air brakes
Which part of the vehicle drives the air compressor?
Correct answer: The engine.
Answer options
- AThe drive shaft
- BThe engine Correct
- CThe radiator
Why
The compressor is linked to the engine through gears or a V-belt, and the engine's power lets it pump air into the storage tanks. Some compressors are cooled by the engine's cooling system, but the radiator does not drive the compressor, and neither does the drive shaft.
About this question
Topic: Air brakes License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of How Air Brakes Work (18 questions). Take the full set and check your score.
Practice How Air Brakes WorkMore questions from How Air Brakes Work
- If the air compressor springs a leak, which valve keeps the stored air from escaping?
- What is the purpose of an alcohol evaporator in an air brake system?
- In an air brake system, what is the purpose of the air storage tanks?
- Air brakes are really several braking systems combined. Which of these is NOT one of them?
- On an air brake system, what pressure does it normally take for the safety valve to open?
- On a vehicle with air brakes, what do the brake shoes and linings press against each time you brake?
- Air-braked trucks and buses most often use which kind of brake at the wheels?
- Your air brake system's safety relief valve starts letting air escape. What does this tell you?
Practice on your phone.
Practice here in your browser, or use the app with the same questions and explanations. It's free on the App Store.