CDL Combination Vehicle Test

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1. After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
2. There are two things that a driver can do to prevent a rollover. They are (1) keep the cargo as close to the ground as possible (2)
3. The fifth wheel locking lever is not locked after the jaws close around the king pin. This means that:
4. When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:
5. What will happen if the air lines are crossed when you hookup to an old trailer?
6. You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:
7. When backing a tractor under a trailer you should:
8. When driving a set of doubles it is necessary to close which shut off valve in the last trailer
9. You should not back a tractor under a trailer until the whole air system is:
10. You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should:
11. After connecting the air lines but before backing under the trailer you should:
12. The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ____ brake line
13. The air leakage rate for a combination vehicle (engine off, brakes on) should be less than ______ psi per minute
14. Air and electrical lines from the tractor to the trailer should be:
15. In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack knife. Which of the statements is true?
16. When checking the trailer emergency brakes the tractor protection control valve should be placed in what position?
17. What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?
18. The semitrailer made before 1975 that are equipped with the air brakes:
19. When coupling, the proper position of the fifth wheel is:
20. While checking if the trailer is securely coupled to the trailer the landing gears should be:

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