You should check trailer height before connecting a converted dolly to a second or third trailer. The trailer height is right when:
Answer: B
The trailer will be raised slightly when the converter dolly is backed under it.
The height of the trailer needs to be positioned so that the kingpin is slightly lower than the fifth wheel. When the converter dolly (or truck) is backed into it the trailer raises slightly on the fifth wheel.
All choices
- AThe center of the kingpin will line up with the locking jaws.
- BThe trailer will be raised slightly when the converter dolly is backed under it.
- CThe fifth wheel will be touching the trailer.
CDL Doubles/Triples Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The Doubles/Triples test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
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More CDL Doubles/Triples Practice Questions
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. When you do this, you should hear:
- The purpose of a converter dolly is to:
- Converter dollies:
- The converter dolly air tank drain valve on coupled double/triple trailers should be: