Shut-Off Valves - ONLINE CDL SCHOOL

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Shut-Off Valves

Build confidence with 10 original questions about Shut-Off Valves. Review your answers and explanations after finishing.

Supplemental study practice. This is not a government licensing exam or ELDT certification, and does not replace hands-on training. Follow your state’s current handbook.

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1 / 10

You are about to test that air flows to all trailers in a double or triple rig. What should you do after pushing in the trailer air supply knob?

Open the emergency line shut-off valve at the rear of the last trailer

Release the pintle hook

Disconnect the light cords

Lower the landing gear

2 / 10

You are inspecting a set of doubles. What position should the shut-off valves be in at the rear of the first trailer?

Halfway open

Open

Partially closed

Closed

3 / 10

You are inspecting the converter dolly during a walkaround. What should you check about the pintle-eye?

It is in place in the pintle hook of the trailer

It is painted yellow

It is disconnected from the trailer

It is locked in the landing gear

4 / 10

You have just coupled a set of doubles. What should you do with the shut-off valves at the rear of the last trailer?

Open them

Close them

Leave one open and one closed

Set them halfway

5 / 10

During a walkaround inspection of a double or triple trailer, what should you check regarding the air and electric lines?

Air lines are tightly coiled

Air lines are painted blue

Air lines are supported and glad hands are properly connected

Electric lines are disconnected

6 / 10

You are about to park your double trailer rig in a lot. What is a key consideration to avoid a difficult departure?

Park on a steep incline

Park as close to other vehicles as possible

Make sure you can pull straight through when leaving

Back into a tight corner

7 / 10

You are about to move a converter dolly by hand into position. What must you do before moving it if it has spring brakes?

Disconnect the safety chains

Use the dolly parking brake control to release the brakes

Open the air tank petcock

Lower the landing gear

8 / 10

You are about to connect a converter dolly to the rear trailer. What should you do with the landing gear before moving the dolly under the trailer?

Lower the landing gear completely

Remove the landing gear

Leave the landing gear fully extended

Raise the landing gear slightly off the ground

9 / 10

You are preparing to test the trailer service brakes on a double trailer. What is the correct procedure after building up normal air pressure and releasing the parking brakes?

Move the vehicle forward slowly and apply the trailer brakes with the hand control

Lower the landing gear and disconnect the air lines

Apply the parking brakes and check the lights

Open the emergency line shut-off at the rear of the first trailer

10 / 10

You are inspecting a double or triple trailer during your walkaround. What should you check regarding the landing gear?

It is lubricated

It is painted red

It is partially lowered

It is fully raised and not damaged

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About the Shut-Off Valves practice quiz

This practice quiz focuses on Shut-Off Valves, listed under CDL Practice — Doubles and Triples. Use it to check what you understand, spot topics to revisit, and connect the material to safe, informed decisions on the road.

Before you begin

Keep your current CDL manual or course notes nearby. Read each prompt carefully and think through why an answer fits, especially when a question describes a vehicle, road, or workplace situation. Licensing rules and procedures can vary, so confirm requirements with current official materials for your state.

After you finish

Review any explanations shown with your results. Note unfamiliar terms or missed concepts, then revisit your manual or course notes before trying again. Use your score to guide study; understanding why an answer is correct matters more than the number alone.

Study note: These quizzes are independent study practice. They are not state licensing exams, official government materials, or ELDT certification, and they do not replace required training.

Explore CDL Tests to find more practice by subject.