CDL Combination Vehicles Practice Test 2
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Question 1 of 10
1. Question
The trailer protection valve is designed to close automatically if the air pressure reaches the range of
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Question 2 of 10
2. Question
You should always test the trailer brakes before driving by
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Question 3 of 10
3. Question
If you are parking a trailer without spring brakes, which of the following should you use?
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Question 4 of 10
4. Question
Which of the following keeps air in the tractor of truck brake system in case there is a bad leak or a trailer break away?
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Question 5 of 10
5. Question
The coupling device used to connect the service and emergency air lines from the truck to the trailer is known as?
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Question 6 of 10
6. Question
Which of the following is a valve used at the back of a trailer that allows the closing of the air lines when another trailer is not being towed?
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Question 7 of 10
7. Question
Which of the following devices should you use to prevent water and dirt from getting into the coupler and air lines when they are not in use?
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Question 8 of 10
8. Question
How are the air lines color coded to keep them from getting mixed up?
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Question 9 of 10
9. Question
You could experience steering problems because of friction between the tractor and trailer if you do not lubricate which of the following?
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Question 10 of 10
10. Question
If you are lowering the landing gear of a loaded trailer, you should
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