Fifth Wheel Components - ONLINE CDL SCHOOL

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Fifth Wheel Components

Build confidence with 10 original questions about Fifth Wheel Components. 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

After backing the tractor so the fifth wheel just touches the trailer, what is your next step before continuing to couple?

Immediately back under the trailer at full speed

Disconnect the air lines

Lower the landing gear completely

Set the parking brake and put the transmission in neutral

2 / 10

Before backing your tractor under a trailer to couple, you notice the fifth wheel plate is dry and not greased. What should you do?

Continue coupling, as lubrication is not necessary

Spray the plate with water to reduce friction

Apply grease to the fifth wheel plate as required

Lower the trailer to compensate for the lack of grease

3 / 10

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

Do not drive the unit; get the coupling fixed

Apply more grease to the fifth wheel

Raise the landing gear higher

Continue driving as long as the kingpin is locked

4 / 10

You have just connected the air lines to the trailer during coupling. What should you do to check for crossed air lines?

Release the landing gear and observe the trailer

Apply and release the trailer brakes and listen for their operation

Check the air lines for color coding only

Drive forward and check for warning lights

5 / 10

After raising the landing gear during coupling, what must you do with the crank handle?

Remove it and store it in the cab

Use it to check the kingpin

Secure it safely in its bracket

Leave it hanging for easy access

6 / 10

During a walkaround inspection, you notice the crank handle for the landing gear is missing. What should you do before moving the vehicle?

Leave the landing gear partially raised

Use a wrench as a substitute for the crank handle

Drive carefully and report the missing handle later

Replace or secure the crank handle before driving

7 / 10

You are preparing to couple your tractor to a trailer. What is the correct position for the fifth wheel before backing under the trailer?

Tilted down toward the end of the tractor, jaws closed

Tilted down toward the end of the tractor, jaws open

Tilted up away from the tractor, jaws closed

Flat and level, jaws closed

8 / 10

You are about to pull the tractor completely clear of the trailer during uncoupling. What should you check first?

Release the parking brake and accelerate quickly

Lower the landing gear all the way to the ground

Ensure the ground is supporting the trailer and landing gear is not damaged

Disconnect the air lines after moving the tractor

9 / 10

During uncoupling, after lowering the landing gear and disconnecting air and electrical lines, what is the correct way to unlock the fifth wheel?

Push the release handle down and lock it

Turn the crank handle on the landing gear

Raise the release handle lock and pull the release handle to the open position

Disconnect the kingpin from the jaws manually

10 / 10

While coupling, you notice the trailer is higher than the fifth wheel. What should you do before backing under the trailer?

Raise the trailer even higher

Remove the landing gear completely

Lower the trailer so it will be raised slightly by the tractor

Back under the trailer as it is

Your score is

The average score is 0%

About the Fifth Wheel Components practice quiz

This practice quiz focuses on Fifth Wheel Components, 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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