CDL · Doubles and triples
What is unique about the way triple trailers are coupled?
Correct answer: The third trailer is coupled to the second one before that pair is coupled to the first trailer.
Answer options
- AThe third trailer is coupled to the second one before that pair is coupled to the first trailer. Correct
- BNo converter dolly is needed anywhere between the trailers.
- CThe second trailer is coupled to the first one before that pair is coupled to the tractor.
Why
With triples you start at the back: join the third trailer to the second using the doubles method, then couple the tractor to the first trailer and connect that unit to the second-and-third pair.
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 release the pintle hook before the converter dolly has been pulled out from under the second trailer. What is the likely result?
- What must be done with the rear shut-off valves before air can reach the second trailer's air tanks?
- What are the basic components of a converter dolly?
- You are about to hook up a second trailer that has no spring brakes. How can you hold it in place first?
- You have backed the converter dolly under the rear trailer of a double and are about to check the coupling. How should that trailer's landing gear be positioned?
- You are unhooking the second semitrailer of a double. To what point do you crank down its landing gear?
- Your set of twins includes a loaded rear trailer that you are about to unhook. How low should its landing gear go?
- Which description best fits a converter dolly?
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