🚛CDL Doubles/Triples — Question 8 of 20
Before you can supply air to the air tanks of a second trailer you need to:
Answer: A
Open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.
First, open the shut-off valves at the rear of the first trailer. Second, close the shut-off valves at the rear of the second trailer.
All choices
- AOpen the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.
- BOpen the shut-off valves at the rear of both trailers.
- CClose the shut-off valves at the rear of the first trailer and open the shut-off valves at the rear of the second 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
- When pulling multiple trailers, where should the heaviest trailer be located?
- To check if the converter dolly is securely coupled to the rear trailer you should:
- How many axles may be found on a converter dolly?
- During inspection, the converter dolly air tanks drain valve should be _____ and the pintle hook should be _____.
- How are the spring brakes for a converter dolly released?