CDL Combination
Vehicles Test

2

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

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

2 / 40

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

3 / 40

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

4 / 40

Why should you use chocks when parking a trailer without spring brakes?

5 / 40

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

6 / 40

The air leakage rate for combination vehicles should not be more than _ psi a minute.

7 / 40

You should have the fifth wheel plate greased as recommened because:

8 / 40

When should the trailer hand valve be used?

9 / 40

What should you do if you start a trailer skid?

10 / 40

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

11 / 40

There should be ___space between the upper and lower fifth wheel after coupling.

12 / 40

The locking jaws of the kingpin should close around:

13 / 40

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

14 / 40

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

15 / 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:

16 / 40

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

17 / 40

Off-tracking happens when going around a corner and:

18 / 40

Select the vehicle that off-tracks the most.

19 / 40

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

20 / 40

To test the security of the tractor semi trailer connection you should:

21 / 40

A tractor should not be backed under a trailer until the whole air system is:

22 / 40

You should back up slowly until____when coupling the trailer.

23 / 40

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

24 / 40

Select the true statement:

25 / 40

What is the service air line controlled by?

26 / 40

Select the step that comes first:

27 / 40

It is good practice to_____when uncoupling.

28 / 40

A tractor should not be backed under a trailer until the whole air system is:

29 / 40

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

30 / 40

Check to ensure that____when inspecting the coupling.

31 / 40

The purpose for the emergency air line is:

32 / 40

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

33 / 40

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

34 / 40

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

35 / 40

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

36 / 40

How high should you crank the landing gear?

37 / 40

Select the answer that is controlled by the foot brake.

38 / 40

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

39 / 40

What color and shape is the trailer air supply control?

40 / 40

Select the true statement:

Your score is

The average score is 58%

5/5 - (3 votes)

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