Coupling: Connection Checks - ONLINE CDL SCHOOL

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Coupling: Connection Checks

Build confidence with 10 original questions about Coupling: Connection Checks. 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 coupling, you are about to back under the trailer. What should you do to avoid damaging the landing gear?

Back straight in front of the trailer, not at an angle

Turn the wheels slightly to the left

Back quickly to minimize time spent coupling

Lower the trailer as much as possible

2 / 10

While coupling, you notice the fifth wheel plate is dry and not lubricated. What should you do before proceeding?

Continue coupling and lubricate after connecting

Lubricate the fifth wheel plate as required

Lower the trailer further to compensate

Add grease to the kingpin only

3 / 10

After coupling, you inspect the connection and see a space between the upper and lower fifth wheel. What should you do?

Drive slowly and check again after a short distance

Tighten the locking lever

Add more grease to the fifth wheel

Do not drive; get the coupling fixed

4 / 10

You are preparing to couple a tractor to a semitrailer. What should you do if you notice the trailer kingpin is bent?

Continue coupling as usual, but back up more slowly

Do not attempt to couple and have the kingpin repaired

Apply grease to the kingpin before coupling

Lower the trailer to align the kingpin

5 / 10

You have just connected the air lines to the trailer. What must you check before moving the tractor?

That the kingpin is locked

That the trailer lights are working

That the landing gear is fully raised

That air lines are safely supported and will not be crushed or caught

6 / 10

After connecting the air lines, you supply air to the trailer but the spring brakes do not release when you push in the trailer air supply control. What should you check?

Check the landing gear position

Check the trailer lights

Check the kingpin for damage

Check for crossed air lines

7 / 10

After raising the landing gear during coupling, what must you do before driving away?

Secure the crank handle safely in its bracket

Check the kingpin again

Lower the trailer slightly

Apply grease to the landing gear

8 / 10

You are inspecting the coupling system during a walkaround. What should you check about the air lines?

They are properly connected, free from damage, and have enough slack for turns

They are painted red and blue

They are wrapped around the landing gear

They are tightly stretched between tractor and trailer

9 / 10

When connecting glad hands, what should you do to prevent air leaks?

Leave the couplers slightly loose

Apply oil to the seals

Clean the couplers and rubber seals before connecting

Connect the blue line to the red coupler

10 / 10

You are checking the trailer height before coupling. What is the correct position for the trailer?

The trailer should be level with the tractor frame

The trailer should be low enough that it is raised slightly by the tractor when backed under

The trailer should be higher than the fifth wheel

The trailer should be as low as possible

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About the Coupling: Connection Checks practice quiz

This practice quiz focuses on Coupling: Connection Checks, listed under CDL Practice — Combination Vehicles. 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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