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CDL Practice Test: General Knowledge

This 40 question and answer CDL general knowledge practice test will help you check your understanding of the rules related to the safe operation of a semi-truck.

CDL General Knowledge Practice Test


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#1. True or False: Gross Vehicle Weight (GVW) means the total weight of a single vehicle including its load.

#2. How should you know when to shift?

Engine speed and road speed is correct

#3. True or False: It is best to use low beams whenever you can.

False is correct

#4. True or False: As long as the engine isn’t overheated, you can safely remove the radiator cap.

False is correct

#5. True or False: The proper procedure if a tire blows out is to put the brakes on hard to stop quickly.

False is correct

#6. Two causes of tire fires are ______.

under-inflated tires and duals that touch is correct

#7. True or False: When using your fire extinguisher, it is best to get as close as possible to the fire.

False is correct

#8. True or False: Two ways that will help a drinker sober up are coffee and a little fresh air.

False is correct

#9. For any flatbed load you must have at least ____ tie downs.

2 is correct

#10. What are some things you should check on the front of your vehicle when doing the walk-around inspection?

Low beams, high beams, four way flashers, turn signals is correct

#11. What is the reason that placards are used?

Communicate the risk is correct

#12. If you do become sleepy while driving, you should _____.

stop to sleep is obviously correct

#13. You downshift automatic transmissions ______.

before going down a hill is correct

#14. What is the best way to see the sides and rear of your vehicle?

Your mirrors is correct

#15. In safe driving, what does communicating mean?

Letting others know you are there by using turn signals, four way flashers, and horn is correct

#16. True or False: If somebody is following you too closely, you should decrease your following distance.

False is correct

#17. True or False: Another driver may try to pass you on the right if you swing wide to the left before turning right.

True is correct

#18. Wet brakes can cause _____.

All of these is correct

#19. To avoid the effects that wet brakes can cause you may _____.

All of the above is correct

#20. When going down a long, steep downgrade, what factors determine your selection of a safe speed?

Total weight of the vehicle and cargo, length of the grade, steepness of the grade, road conditions, weather is correct

#21. Inspect the cargo and its securing devices again within the first ___ _____ after beginning a trip. Make any adjustments needed.

#22. True or False: Gross Combination Weight (GCW) is the total weight of a combination of vehicles NOT including the load.

#23. True or False: A low center of gravity means you are less likely to tip over when compared to a high center of gravity.

#24. True or False: You should do an after-trip inspection at the end of the trip, day, or tour of duty on each vehicle you operated.

#25. What should you look for when inspecting tires?

#26. You should do a vehicle inspection ______________ so you will learn all the steps and be less likely to forget something.

#27. Under which two special conditions should you downshift?


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