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

Off-tracking happens when going around a corner and:

2 / 40

Select the true statement:

3 / 40

How should the trailer be lined up when preparing to back the tractor up?

4 / 40

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

5 / 40

How high should you crank the landing gear?

6 / 40

Before backing under the trailer after connecting the air lines you should:

7 / 40

Select the load of the trailer that will require the shorter distance to stop.

8 / 40

How do you make sure the air lines are not crossed and the trailer brakes are working after supplying air to the trailer?

9 / 40

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

10 / 40

What will happen should a driver cross the air lines when hooking up the an older trailer?

11 / 40

Remember to_____to prevent rollovers.

12 / 40

Make sure____when the front trailer supports are up and the trailer is sitting on the tractor.

13 / 40

Select the true statement in regards to as why you should make sure the fifth wheel plate is greased as recommended:

14 / 40

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

15 / 40

It is good practice to_____when uncoupling.

16 / 40

After coupling with a trailer, what position should the front trailer supports be in before driving away?

17 / 40

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

18 / 40

Select the definition of "off-tracking."

19 / 40

Select the vehicle that off-tracks the most.

20 / 40

The locking jaws of the kingpin should close around:

21 / 40

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

22 / 40

What should you hook up before backing a tractor to a trailer for coupling?

23 / 40

What might happen if a trailer is too high when you try to couple?

24 / 40

What is a king pin?

25 / 40

When you have a major leak in the service line and you apply pressure to the brakes, the service air pressure will escape and:

26 / 40

What color and shape is the trailer air supply control?

27 / 40

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

28 / 40

What will occur if you cross the connect the air lines?

29 / 40

Select why you should not use the trailer hand valve while driving:

30 / 40

The air leakage rate for a combination vehicle should not exceed ____psi a minute.

31 / 40

You should expect____when backing a tractor under a trailer.

32 / 40

Select the statement that best describes what the service line is for.

33 / 40

The cause of almost half of all truck driver deaths are:

34 / 40

Select the true statement in regards to if a glad hand on the blue air line is missing a seal.

35 / 40

If you park the trailer at an angle to the tractor when uncoupling:

36 / 40

Where are shut-off valves located?

37 / 40

How do you supply air to the trailer tanks?

38 / 40

Select the statement that best describes what the trailer air supply control does:

39 / 40

To test the tractor-trailer connection for security, you should:

40 / 40

Select the true statement in regards to large combination vehicles taking longer to stop.

Your score is

The average score is 70%

5/5 - (3 votes)

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