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Combination Vehicles Practice Test

Take our free online combination vehicles CDL endorsement practice test. The questions and answers are updated for 2021 and are similar to those you'll find on the real test. We've helped thousands of students connect with schools and get training for their CDL license and endorsements.

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Study: CDL manual

Question 1 of 19

What is the correct setup for shut-off valves?

The rear trailers shut-off valves open and the front closed

All shut-off valves should be closed.

All shut-off valves should be open.

The front trailers shut-off valves open and the rear closed

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Combination Vehicles Practice Test

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