CDL · Doubles and triples
What should you use to hold the second trailer still before you couple it to the rest of the doubles combination?
Correct answer: Chocks placed against its wheels.
Answer options
- AA helper holding it by hand.
- BChocks placed against its wheels. Correct
- CA chain linking it to the first trailer.
Why
Chocks wedged against the second trailer's wheels keep it from rolling while you back the converter dolly under it. Neither a helper nor a chain can reliably hold a heavy trailer in place.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
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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
- Compared with an A-dolly, what is the main thing a B-dolly or C-dolly adds?
- What is the reason for moving a dolly clear of the rear trailer before releasing it from the lead trailer?
- In the official CDL manual, the section on doubles and triples generally explains coupling and uncoupling for which combinations?
- Which statement about converter dollies is accurate?
- 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?
- 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?
- When you uncouple twin trailers, which of these is the final step?
- Uncoupling a set of triples starts with which step?
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