CDL Practice Tests

Doubles and Triples Test

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Question #1 of 24

Doubles and Triples Test Question Image

Should the shut-off valves on the trailers be open or closed on a set of double trailers?


All shut-off valves should be open.

The rear trailer does not have shut-off valves.

All shut-off valves should be closed.

The rear trailers shut-off valves should be open, and the front closed.

The rear trailers shut-off valves should be closed, and the front open.

None of the above.




 

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Combination Vehicles (Learning) | Hazardous Materials (Learning) | Doubles & Triples (Learning)

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