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Commercial Driver’s License (CDL) Exam Endorsement Test: The Doubles/Triples Test
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Commercial Driver’s License (CDL) Exam Endorsement Test: The Doubles/Triples Test
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25 Questions

1. When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position.
2. What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly
3. When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Which diagram shows the best way to turn
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4. Which of the following must be connected when coupling tractor to trailer or trailer to trailer
5. While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel.
6. You are driving a tractor with multiple trailers. Which of the following statements about offtracking is true
7. When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer.
8. Which of the following is true about loading cargo into double or triple trailers
9. Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid
10. When checking the coupling system, make sure that the locking jaws are around the shank of the
11. Converter dollies often do not have
12. The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples
13. What is one function of the tractor protection valve
14. While doing a walkaround inspection of a double or triple, the converter dolly air tank drain valve should be _______, and the pintle hook should be _______.
15. During a jackknife, it is best to
16. When driving a double or triple trailer, greater care must be given to
17. When you are pulling trailers, which of the following statements is true about steering
18. Trucks with trailers have a dangerous “crack-the-whip” effect. Because of this, which of the following vehicle parts is most likely to tip over
19. You are driving a triple trailer and there is a loss of air pressure in the emergency line. Which of the following will occur
20. When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer.
21. You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. This means
22. It is important to check the height of the trailer before connecting a converter dolly to a trailer. The trailer is at the correct height when
23. If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you
24. The pintle hook plays a part in
25. Trucks that are empty or lightly loaded

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