Converter Dollies - ONLINE CDL SCHOOL

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Converter Dollies

Build confidence with 10 original questions about Converter Dollies. 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

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

Lower the dolly landing gear

Disconnect the safety chains

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

Release the dolly brakes by opening the air tank petcock

2 / 10

When inspecting the shut-off valves during a walkaround of a double trailer, what position should the valves be in at the rear of the last trailer?

Halfway open

Open

It does not matter

Closed

3 / 10

While preparing to uncouple the rear trailer from a double, what is the safest ground condition for parking your rig?

On soft gravel

On a steep slope

Firm and level ground

On a slight incline

4 / 10

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

They are properly connected and free from damage

They are disconnected for safety

They are tied together with rope

They are painted yellow for visibility

5 / 10

You are preparing to couple twin trailers. Where should the more heavily loaded semitrailer be placed for safest handling?

It does not matter

First position behind the tractor

On the converter dolly

In the rear position

6 / 10

You are inspecting a double trailer. What should you check about the pintle hook before driving?

It is covered with grease

It is unlocked for easy access

It is painted red

It is latched and secured

7 / 10

After charging the trailer brakes on a double, how can you check that air is reaching the rear trailer?

Check the color of the air lines

Look for a pressure gauge on the dolly

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

Tap the trailer frame with a hammer

8 / 10

After coupling a converter dolly to the rear trailer, how do you confirm the coupling is secure?

Check if the landing gear is fully lowered

Open the emergency line shut-off valve

Release the parking brakes

Pull gently against the pin of the second semitrailer

9 / 10

When preparing to uncouple a converter dolly, what should you do after lowering the dolly landing gear and disconnecting safety chains?

Raise the dolly support

Open the shut-off valves

Apply converter gear spring brakes or chock wheels

Release the pintle hook immediately

10 / 10

You are preparing to couple a converter dolly to the rear trailer. What should you do to prevent damage if the trailer moves during coupling?

Disconnect the safety chains

Release the pintle hook before backing up

Lower the landing gear fully to the ground

Raise the landing gear slightly off the ground

Your score is

The average score is 0%

About the Converter Dollies practice quiz

This practice quiz focuses on Converter Dollies, 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.