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APG study resources · Vehicles

Automotive Basics Practice

Build confidence with engines, maintenance, brakes, steering and diagnosis. 50 original APG questions, short lessons and answer explanations.

Independent, unofficial learning practice. This is not an official exam, complete training course or certificate. Follow current local requirements and manufacturer instructions, and use qualified instruction for hands-on work.

Start with a short lesson

Understand the system

Identify what each component does before diagnosing a fault. A symptom or trouble code is a starting point, not proof that a particular part has failed.

Use vehicle-specific information

Follow the service manual for fluids, lifting points, torque values and procedures. Stop driving with serious braking, steering or oil-pressure problems.

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0 of 50 answered

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1. What is the main purpose of engine oil?
2. Which component stores electrical energy for starting a conventional vehicle?
3. What does an alternator do while the engine is running?
4. What does the radiator primarily help remove?
5. What does an engine thermostat regulate?
6. In a gasoline engine, what normally ignites the compressed mixture?
7. How does a conventional diesel engine ignite its fuel?
8. What does an intake air filter do?
9. What is the purpose of a fuel injector?
10. Which system carries combustion gases away from the engine?
11. What does a catalytic converter help do?
12. What does a differential allow during a turn?
13. What does a conventional manual-transmission clutch do?
14. Which part do disc-brake pads press against?
15. Which part do drum-brake shoes press against?
16. What is ABS designed to help prevent during hard braking?
17. Where should you find the recommended cold tire pressure for a passenger car?
18. What does tire tread help channel away on wet pavement?
19. What is a shock absorber mainly designed to control?
20. What does a ball joint allow in a suspension?
21. What do tie rods connect in a typical steering system?
22. What is the best response to a sudden loss of braking effectiveness?
23. What does an OBD-II trouble code usually provide?
24. What is an engine misfire?
25. What should you do with a flashing check-engine light and rough running?
26. When should you remove a pressurized radiator cap?
27. Why check fluid specifications before topping up?
28. What does a serpentine belt commonly drive?
29. What should you do if an accessory belt is badly frayed?
30. What is a wheel bearing's main role?
31. What is the purpose of a CV joint?
32. Why inspect a torn CV boot promptly?
33. What does the master cylinder do in a hydraulic brake system?
34. What is a brake-fluid leak a reason to do?
35. What does a parking brake primarily do?
36. What does engine compression describe?
37. What is a cylinder leak-down test used to investigate?
38. Why record symptoms before starting a repair?
39. Why compare a replacement belt with the correct application data?
40. What does a cabin air filter commonly filter?
41. Which part transfers piston motion to the crankshaft?
42. What does the camshaft control in a conventional four-stroke engine?
43. What are the four strokes of a conventional four-stroke engine?
44. What does a turbocharger use to drive its turbine?
45. What does an intercooler do in many turbocharged systems?
46. Why follow the specified wheel-fastener torque?
47. What does wheel alignment concern?
48. What does wheel balancing correct?
49. What is a good next step after a repair?
50. What should you do before working under a raised vehicle?