CDL Combination
Vehicles Test

3

This is the Commercial Vehicle Driver's License Test covering Combination Vehicles.  You will be presented with 40 questions and you must answer 34 questions correctly to pass.  There is no time limit.  You may not go back once you answer a question.  Click the "Start Quiz" button below to begin.  Good luck!

1 / 40

You should line up_____when getting ready to back under the trailer.

2 / 40

You should make sure the_____before backing under a trailer.

3 / 40

To prevent a roll over a driver can 1) keep the cargo as low to the ground as possible and 2) _____.

4 / 40

Select the true statement in regards to what the fifth wheel should be checked for.

5 / 40

You should____in order to inspect the coupling.

6 / 40

Select the true statement:

7 / 40

How do you check the connection after locking the kingpin into the fifth wheel?

8 / 40

Select the two things that are important in preventing a rollover:

9 / 40

Is it important to look into the back of the fifth wheel to see if the lockpin is locked in?

10 / 40

The emergency air line is used to:

11 / 40

What should you do if you start a trailer skid?

12 / 40

Select the situation in which you should use the hand valve to park a combination vehicle.

13 / 40

Make sure that_____before you back under a trailer.

14 / 40

The trailer should be lowered so that _____.

15 / 40

A trailer is at the right height to have the tractor backed up to it when:

16 / 40

You should back up slowly until____when coupling the trailer.

17 / 40

Select the statement that best explains the "crack-the-whip" effect.

18 / 40

You must first______to supply air to the trailer.

19 / 40

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

20 / 40

The _____of the kingpin has the locking jaw close around it.

21 / 40

You should expect____when backing a tractor under a trailer.

22 / 40

______is a device that connects the service and emergency air lines between the tractor and trailer.

23 / 40

Remember to_____to prevent rollovers.

24 / 40

Make sure that____when the front trailer supports are up and the trailer is resting on the tractor.

25 / 40

The locking jaws of the kingpin should close around:

26 / 40

When should the trailer hand valve be used?

27 / 40

How should the hand valve be used?

28 / 40

What position should the tractor protection control valve be in after coupling?

29 / 40

Why should you not use the trailer hand brake to straighten out a jackknifing trailer?

30 / 40

What is the earliest way to notice a trailer skid?

31 / 40

Select when you should use the hand valve to park a combination vehicle.

32 / 40

What will happen right away should the service air line come apart but the emergency line is intact while driving a combination vehicle?

33 / 40

The front trailer supports should be____before driving away.

34 / 40

Select the portion of the combination vehicle that is most likely to turn over suddenly when pulling a double trailer:

35 / 40

Before backing under the trailer you should______when coupling a tractor and trailer with air lines already connected.

36 / 40

Where should the safety catch for the fifth wheel locking lever be located for coupling to be complete?

37 / 40

Where are shut-off valves located?

38 / 40

Select the accurate statement in regards to rolling up the landing gear to complete the coupling process.

39 / 40

What is a king pin?

40 / 40

Select what you should not do when coupling the glad hands.

Your score is

The average score is 70%

5/5 - (3 votes)

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