CDL Practice Test General Knowledge 2024| CDL Class A Practice test

1. What is the minimum age requirement for obtaining a CDL?
a. 18
b. 21
c. 25
d. 21 for interstate, 18 for intrastate

2. Which type of vehicle requires a CDL?
a. Motorcycle
b. Passenger car
c. Large truck
d. Bicycle

3. When should you inspect your vehicle during a trip?
a. Only at the beginning
b. Before you start and during each break
c. At the end of the trip
d. Every 500 miles

4. What is the purpose of a pre-trip inspection?
a. To waste time
b. To find and report problems
c. To impress your supervisor
d. To show off your driving skills

5. The use of drugs while driving a commercial vehicle:
a. Is allowed if prescribed
b. Is it illegal
c. Can improve concentration
, d. It is recommended for long trips

6. Which type of fire is the most common in a commercial vehicle?
a. Electrical
b. Paper
c. Gasoline
d. Oil

7. What does a yellow diamond-shaped sign with a black symbol indicate?
a. Speed limit ahead
b. Railroad crossing
c. Stop sign
d. Warning sign

8. Which of the following is a distracted driving?
a. Adjusting the radio
b. Eating while driving
, c. Both a and b
d. None of the above

9. What do “blind spots” refer to in a large commercial vehicle?
a. Areas where you cannot see pedestrians
b. Areas where you cannot see other vehicles
c. Areas where the speed limit is reduced
d. Areas where you should park

10. If your vehicle starts to hydroplane, what should you do?
a. Slam on the brakes
b. Turn the steering wheel sharply
c. Release the accelerator and steer in the direction you want to go
d. Accelerate to regain control

11. What is the purpose of the Anti-lock Braking System (ABS)?
a. To lock the brakes in case of emergency
b. To reduce tire pressure
c. To prevent wheel lock-up during braking
d. To increase fuel efficiency

12. How often should you check your mirrors while driving?
a. Every 2 minutes
b. Every 5 minutes
c. Regularly throughout the trip
d. Only when changing lanes

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13. What is the minimum tread depth for front tires on a commercial vehicle?
a. 2/32 inch
b. 4/32 inch
c. 6/32 inch
d. 8/32 inch

14. When approaching a railroad crossing, what should you do?
a. Speed up to clear the tracks quickly
b. Stop within 15 to 50 feet of the tracks if a train is approaching
c. Honk your horn continuously
d. Shift to a higher gear

15. What is the primary purpose of the cargo securement rules?
a. To increase fuel efficiency
b. To reduce tire wear
c. To prevent cargo from shifting and falling
d. To speed up the unloading process

16. What is the minimum age requirement for operating a commercial vehicle in interstate commerce?
a. 18 years old
b. 21 years old
c. 25 years old
d. 16 years old

17. When should you use your hazard warning lights?
a. To indicate a turn
b. During normal driving conditions
c. When driving in foggy conditions
d. When your vehicle is a temporary hazard

18. How should you adjust your Speed when driving on slippery surfaces like snow or ice?
a. Increase Speed
b. Reduce Speed
c. Maintain the same Speed
d. Shift to a higher gear

19. What is the maximum allowable blood alcohol concentration (BAC) for a commercial driver?
a. 0.05%
b. 0.04%
c. 0.08%
d. 0.10%

20. How far ahead should you look while driving?
a. 1-2 seconds
b. 12-15 seconds
c. 5-7 seconds
d. 8-10 seconds

21. What is the purpose of the Smith System in driving?
a. To conserve fuel
b. To prevent accidents by managing space, visibility, and time
c. To increase vehicle speed
d. To reduce tire wear

22. What is the proper way to adjust the side mirrors?
a. Pointing downwards
b. Pointing straight ahead
c. To see the side of the vehicle but not the trailer
d. Parallel to the ground

23. What is the purpose of the No-Zone areas around a large commercial vehicle?
a. To reserve parking spaces
b. To increase fuel efficiency
c. To alert drivers of areas where they are not visible to the truck driver
d. To mark areas where overtaking is allowed

24. When approaching a curve, what should you do?
a. Speed up to maintain momentum
b. Slow down before entering the curve
c. Honk the horn continuously
d. Shift to a higher gear

25. What is the purpose of the Under-ride Protection on a trailer?
a. To improve aerodynamics
b. To prevent smaller vehicles from sliding underneath the trailer in a collision
c. To increase fuel efficiency
d. To reduce noise levels

26. How often should you take breaks during long driving trips?
a. Only when feeling tired
b. Every 6 hours
c. Every 2 hours or 100 miles, whichever comes first
d. Only when the fuel tank is empty

27. What is the primary cause of skidding while driving?
a. Low tire pressure
b. Driving too fast for road conditions
c. Faulty brakes
d. Lack of fuel

28. What is the purpose of the Emergency Air Brake System?
a. To increase fuel efficiency
b. To reduce tire wear
c. To stop the vehicle in the event of air brake failure
d. To improve engine performance

29. How should you handle a tire blowout while driving?
a. Speed up to maintain control
b. Grip the steering wheel firmly and stay off the brakes until the vehicle slows down
c. Slam on the brakes immediately
d. Shift to a higher gear

30. What is the purpose of the Commercial Driver’s License Information System (CDLIS)?
a. To track vehicle fuel efficiency
b. To monitor driver speed
c. To centralize and share information related to commercial driver’s licenses
d. To calculate vehicle weight

31. What is the minimum following distance you should maintain behind another vehicle?
a. 1 second
b. 2 seconds
c. 4 seconds
d. 6 seconds

32. How does fatigue affect a driver’s vehicle operation ability?
a. Increases concentration
b. Decreases reaction time and impairs judgment
c. Enhances decision-making skills
d. Boosts energy levels

33. What is the Vehicle Inspection Report’s (VIR) purpose?
a. To increase fuel efficiency
b. To assess tire pressure
c. To document and report any vehicle defects or malfunctions
d. To calculate vehicle weight

34. When driving downhill, what should your Speed be?
a. Increase Speed
b. Use engine braking and shift to a lower gear
c. Slam on the brakes
d. Turn off the engine

35. What is the purpose of the Hazardous Materials (HazMat) endorsement?
a. To carry passengers
b. To transport livestock
c. To transport hazardous materials
d. To increase fuel efficiency

36. How should you approach a yellow traffic light?
a. Speed up to clear the intersection quickly
b. Slow down and prepare to stop
c. Maintain the same Speed
d. Honk the horn continuously

37. What is the purpose of the Gross Combination Weight Rating (GCWR)?
a. To determine the weight of the cargo
b. To specify the maximum combined weight of the vehicle and its trailer
c. To assess tire pressure

38. When should you use your low-beam headlights?
a. Only at night
b. During adverse weather conditions, such as rain, snow, or fog
c. Only in rural areas
d. Only in urban areas

39. What is the purpose of the Manual Transmission?
a. To adjust the Speed of the windshield wipers
b. To allow the driver to select and change gears manually
d. To control the volume of air conditioning

40. How does a driver avoid a skid on a slippery road?
a. By avoiding sudden steering, acceleration, and braking movements
b. By increasing Speed
c. By turning the steering wheel sharply
d. By slamming on the brakes

41. What is the primary purpose of the Department of Transportation (DOT) physical exam?
a. To assess vision and hearing
b. To monitor blood pressure
c. To determine a driver’s physical fitness to operate a commercial vehicle
d. To check for allergies

42. When should you use tire chains?
a. Only during heavy rain
b.When driving on snow or ice
c. Only during daytime
d. Only in urban areas

43. What is the purpose of the Commercial Driver’s License (CDL)?
a. To i3ncrease fuel efficiency
b. To reduce tire wear
c. To ensure that drivers of commercial vehicles possess the necessary skills and knowledge
d. To track vehicle speed

44. When should you turn on your headlights?
a. Only at night
b. Half an hour after sunset and half an hour before sunrise
c. Only in urban areas
d. Only in rural areas

45. What is the purpose of the Overhead Clearance Warning Sign?
a. To indicate a speed limit
b. To assess tire pressure
c. To warn drivers of low bridges or overpasses
d. To calculate vehicle weight

46. How does a driver minimize blind spots in a commercial vehicle?
a. By increasing Speed
b. By adjusting the radio volume
c. By properly adjusting mirrors and being aware of blind spots
d. By turning off the headlights

47. What is the maximum allowable blood alcohol concentration (BAC) for a commercial driver?
a. 0.05%
b. 0.04%
c. 0.08%
d. 0.10%

48. How often should you inspect your cargo during a trip?
a. Only at the beginning
b. Before you start and during each break
c. Regularly throughout the trip
d. Only at the end of the trip

49. What is the primary purpose of the Cargo Securement Rules?
a. To increase fuel efficiency
b. To reduce tire wear
c. To prevent cargo from shifting and falling
d. To speed up the unloading process

50. When should you use your hazard warning lights?
a. To indicate a turn
b. During normal driving conditions
c. When driving in foggy conditions
d. When your vehicle is a temporary hazard