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?
Every 3 to 5 seconds or engine speed
Engine speed and the shift indicator light
Engine speed and road speed
Road speed and wind speed
Engine speed and road speed is correct
#3. True or False: It is best to use low beams whenever you can.
#4. True or False: As long as the engine isn’t overheated, you can safely remove the radiator cap.
#5. True or False: The proper procedure if a tire blows out is to put the brakes on hard to stop quickly.
#6. Two causes of tire fires are ______.
duals that touch and road debris
under-inflated tires and duals that touch
hot brakes and under-inflated tires
under-inflated tires and poor retreads
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.
#8. True or False: Two ways that will help a drinker sober up are coffee and a little fresh air.
#9. For any flatbed load you must have at least ____ tie downs.
#10. What are some things you should check on the front of your vehicle when doing the walk-around inspection?
Oil, transmission, air compressor, radiator
Windshield, wipers, mirrors, hood latches
Tires, steering parts, suspension parts, headlights
Low beams, high beams, four way flashers, turn signals
None of these
Low beams, high beams, four way flashers, turn signals is correct
#11. What is the reason that placards are used?
Communicate the risk
So hazmat is not mixed with food
To prevent terrorism
It is the law
Communicate the risk is correct
#12. If you do become sleepy while driving, you should _____.
turn up the radio
stop to sleep
drink caffeinated beverages
roll down the windows
stop to sleep is obviously correct
#13. You downshift automatic transmissions ______.
at the bottom of a hill
before going down a hill
half way down a hill
None of these
before going down a hill is correct
#14. What is the best way to see the sides and rear of your vehicle?
Roll the window down
Rear view cameras
All of the above
#15. In safe driving, what does communicating mean?
Using hand signals
Using a CB radio to let others know your intentions
Letting others know you are there by using turn signals, four way flashers, and horn
None of these
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.
#17. True or False: Another driver may try to pass you on the right if you swing wide to the left before turning right.
#18. Wet brakes can cause _____.
lack of braking power
brakes to apply unevenly
pulling to one side or the other
All of these
#19. To avoid the effects that wet brakes can cause you may _____.
gently put on the brakes. this presses linings against brake drums or discs and keeps mud, silt, sand, and water from getting in
place transmission in a low gear
when out of the water, maintain light pressure on the brakes for a short distance to heat them up and dry them out
All of the above
All of the above is correct
#20. When going down a long, steep downgrade, what factors determine your selection of a safe speed?
Length of the grade and steepness of the grade
Total weight of the vehicle, steepness of the grade, weather
Total weight of the vehicle and cargo, length of the grade, steepness of the grade, road conditions, weather
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?
Too much or too little air pressure
Cuts or other damage
Cut or cracked valve stems
All of these and more
#26. You should do a vehicle inspection ______________ so you will learn all the steps and be less likely to forget something.
a new way each time
the same way each time
#27. Under which two special conditions should you downshift?
Before starting down a hill and before entering a curve
Before starting down a hill and before going up a hill
If there is an accident and in sudden heavy rain
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