CDL · Doubles and triples
When you uncouple twin trailers, which of these is the final step?
Correct answer: Ease the tractor and first trailer forward, clear of the dolly.
Answer options
- AUnhitch the converter dolly from the first trailer.
- BRelease the brakes on the converter dolly.
- CEase the tractor and first trailer forward, clear of the dolly. Correct
Why
The dolly comes off last: you lower its landing gear, remove the safety chains, set its brakes or chock its wheels, and release the pintle hook. Only then do you slowly pull the tractor and first trailer away from it, which completes the job.
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
- You are getting ready to hook a second trailer to your rig. What can you use to hold that trailer in place?
- 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?
- Which of these steps do you carry out first when uncoupling standard doubles?
- In the official CDL manual, the section on doubles and triples generally explains coupling and uncoupling for which combinations?
- Which statement about a converter dolly is true?
- Compared with an A-dolly, what is the main thing a B-dolly or C-dolly adds?
- You are about to uncouple the rear trailer. What do you do first?
- What should you use to hold the second trailer still before you couple it to the rest of the doubles combination?
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