Uncoupling Triple Trailers - ONLINE CDL SCHOOL

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Uncoupling Triple Trailers

Build confidence with 10 original questions about Uncoupling Triple Trailers. 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.

1 / 10

During a walkaround inspection of a triple trailer, what should you check about the converter dolly’s pintle-eye?

It is in place in the pintle hook of the trailer

It is locked with a padlock

It is painted red for visibility

It is lubricated with grease

2 / 10

You are preparing to uncouple a triple trailer rig. What is the correct first step when removing the third trailer?

Release the pintle hook before moving the dolly

Pull the dolly out from under the third trailer

Disconnect the air and electric lines first

Lower the landing gear on the first trailer

3 / 10

When uncoupling the remainder of a triple trailer rig after removing the third trailer, what procedure should you follow?

Release all parking brakes simultaneously

Disconnect all trailers at once

Use the same method as for uncoupling a double-bottom rig

Lower all landing gear before moving the tractor

4 / 10

While preparing to uncouple the converter dolly from the first trailer in a triple, what must you do before releasing the pintle hook?

Disconnect the light cords first

Lower the landing gear on the first trailer

Apply the converter gear spring brakes or chock the wheels

Open the shut-off valves at the rear of the last trailer

5 / 10

You are inspecting a triple trailer. What should you check about the shut-off valves at the rear of the last trailer?

They are closed

They are partially open

They are disconnected

They are open

6 / 10

After pulling the dolly out from under the third trailer during uncoupling, what is the next step?

Release the pintle hook on the first trailer

Disconnect the light cords from the tractor

Unhitch the dolly using the method for uncoupling doubles

Lower the landing gear on the second trailer

7 / 10

When inspecting the landing gear on a triple trailer, what should you look for?

It is locked with a chain

It is painted yellow

It is covered with grease

It is fully raised and not damaged

8 / 10

During a walkaround inspection, what should you check regarding the light cords on a triple trailer?

They are disconnected for safety

They are hanging loosely

They are firmly in sockets on trailers

They are tied to the frame

9 / 10

You are about to move a converter dolly by hand into position in front of the third trailer. What must you do if the dolly has spring brakes?

Use the dolly parking brake control to release the brakes

Leave the brakes engaged for safety

Lower the dolly landing gear

Disconnect the air lines first

10 / 10

After coupling a triple trailer, how do you check that air is reaching the rear trailer?

Open the emergency line shut-off valve at the rear of the last trailer and listen for air escaping

Check the pressure gauge in the cab

Step on the brake pedal and watch for brake lights

Look for air leaks at the glad hands

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About the Uncoupling Triple Trailers practice quiz

This practice quiz focuses on Uncoupling Triple Trailers, 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.

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