CDL · Doubles and triples
Uncoupling a set of triples starts with which step?
Correct answer: Uncoupling the third trailer from the dolly under it.
Answer options
- AUncoupling the third trailer from the dolly under it. Correct
- BUncoupling the second trailer from the dolly under it.
- CUncoupling the first trailer from the tractor.
Why
Triples come apart from the back forward. First pull the dolly out from under the third trailer and unhitch that dolly, then uncouple the rest of the rig the same way you would a set of doubles.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Coupling Doubles and Converter Dollies (28 questions). Take the full set and check your score.
Practice Coupling Doubles and Converter DolliesMore questions from Coupling Doubles and Converter Dollies
- The dolly is now hitched behind the first trailer, and the second trailer sits on the dolly's fifth wheel. What is the proper way to test this coupling?
- Which description fits a converter dolly?
- Which statement about converter dollies is accurate?
- What is the reason for moving a dolly clear of the rear trailer before releasing it from the lead trailer?
- What should you use to hold the second trailer still before you couple it to the rest of the doubles combination?
- Compared with an A-dolly, what is the main thing a B-dolly or C-dolly adds?
- In the official CDL manual, the section on doubles and triples generally explains coupling and uncoupling for which combinations?
- When you drop the rear trailer from a double combination, what should you do with the air shut-off valve at the back of the front trailer?
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