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Combination Test 1
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Question 1 of 20
1. Question
Rollovers happen when drivers:
Correct
A rollover happens as a result of a driver taking a turn at too high a speed. Be sure to take turns and curves safely and slowly.
Incorrect
A rollover happens as a result of a driver taking a turn at too high a speed. Be sure to take turns and curves safely and slowly.
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Question 2 of 20
2. Question
Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Correct
Incorrect
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Question 3 of 20
3. Question
____ are the cause of more than half of all accident-related truck driver deaths.
Correct
More than half of all accident-related truck driver deaths are a result of truck rollovers. To help prevent a rollover, be sure to load cargo low to the ground and centered on your rig. Take corners slowly and carefully.
Incorrect
More than half of all accident-related truck driver deaths are a result of truck rollovers. To help prevent a rollover, be sure to load cargo low to the ground and centered on your rig. Take corners slowly and carefully.
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Question 4 of 20
4. Question
Pull out the trailer air supply control to test:
Correct
Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the “emergency” position. Pull forward slightly with the tractor and make sure the trailer does not move.
Incorrect
Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the “emergency” position. Pull forward slightly with the tractor and make sure the trailer does not move.
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Question 5 of 20
5. Question
An air supply control lever should be in its “normal” position when you are:
Correct
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its “normal” position, it is properly set for you to pull a trailer.
Incorrect
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its “normal” position, it is properly set for you to pull a trailer.
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Question 6 of 20
6. Question
Before backing your tractor under the trailer, make sure your trailer brakes are:
Correct
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. Before backing your tractor under the trailer while coupling, make sure your trailer brakes are locked.
Incorrect
Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. Before backing your tractor under the trailer while coupling, make sure your trailer brakes are locked.
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Question 7 of 20
7. Question
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
Correct
Incorrect
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Question 8 of 20
8. Question
When coupling:
Correct
Incorrect
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Question 9 of 20
9. Question
What is a bobtail tractor?
Correct
Incorrect
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Question 10 of 20
10. Question
Push in the trailer air supply control to:
Correct
Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.
Incorrect
Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.
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Question 11 of 20
11. Question
If a load is placed on one side of a trailer, the trailer:
Correct
Incorrect
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Question 12 of 20
12. Question
How many air lines does a combination vehicle have?
Correct
Every combination vehicle has two air lines: the service line and the emergency line.
Incorrect
Every combination vehicle has two air lines: the service line and the emergency line.
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Question 13 of 20
13. Question
If a trailer begins to skid, the driver should:
Correct
If your trailer starts to skid while you are braking, you should release the brakes and allow them to begin to regain traction. Once its wheels have regained their grip on the road, the trailer will begin to straighten out and follow the tractor.
Incorrect
If your trailer starts to skid while you are braking, you should release the brakes and allow them to begin to regain traction. Once its wheels have regained their grip on the road, the trailer will begin to straighten out and follow the tractor.
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Question 14 of 20
14. Question
If a trailer begins to jackknife, you should not:
Correct
If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because it will only prolong the skid. The application of brakes is what caused the wheels to lock in the first place.
Incorrect
If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because it will only prolong the skid. The application of brakes is what caused the wheels to lock in the first place.
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Question 15 of 20
15. Question
The trailer hand valve should be used:
Correct
The trailer hand valve should be used only to test the trailer brakes. It should not be used while driving because it may cause the trailer to skid.
Incorrect
The trailer hand valve should be used only to test the trailer brakes. It should not be used while driving because it may cause the trailer to skid.
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Question 16 of 20
16. Question
Using the trailer hand valve while driving:
Correct
Never use the trailer hand valve while operating your vehicle. Using the trailer hand valve while driving can cause your trailer to skid.
Incorrect
Never use the trailer hand valve while operating your vehicle. Using the trailer hand valve while driving can cause your trailer to skid.
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Question 17 of 20
17. Question
If you cannot reverse your trailer in a straight path, you should:
Correct
Incorrect
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Question 18 of 20
18. Question
When lightly loaded, combination vehicles:
Correct
When a combination vehicle is lightly loaded, it may have poor traction. It is very easy for wheels to lock up on lightly-loaded vehicles when they are being stopped.
Incorrect
When a combination vehicle is lightly loaded, it may have poor traction. It is very easy for wheels to lock up on lightly-loaded vehicles when they are being stopped.
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Question 19 of 20
19. Question
Rearward amplification refers to:
Correct
Incorrect
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Question 20 of 20
20. Question
What is a tractor protection valve?
Correct
Incorrect
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