CDL · Doubles and triples
Which description fits a converter dolly?
Correct answer: A one- or two-axle unit with a fifth wheel that lets a semitrailer be hooked up behind a tractor-trailer.
Answer options
- AA portable hydraulic jack that raises or lowers the landing gear on a semitrailer parked in a yard
- BA wrench-type hand tool used for tightening the pintle hook where two trailers are joined
- CA one- or two-axle unit with a fifth wheel that lets a semitrailer be hooked up behind a tractor-trailer Correct
Why
A converter dolly has one or two axles and its own fifth wheel. The rear semitrailer rests on that fifth wheel while the dolly hitches to the trailer ahead, which is how a double is put together.
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
- Uncoupling a set of triples starts with which step?
- 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 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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