CDL Combination
Vehicles Test

0

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

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

2 / 40

How should the hand valve be used?

3 / 40

The purpose for the emergency air line is:

4 / 40

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

5 / 40

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

6 / 40

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

7 / 40

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

8 / 40

The emergency air line is _____and the service air line is____.

9 / 40

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

10 / 40

The front trailer supports should be____before driving away.

11 / 40

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

12 / 40

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

13 / 40

You should____in order to inspect the coupling.

14 / 40

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

15 / 40

When driving a combination vehicle, the trailer breaks away severing the air lines. The trailer brakes should come on and ____.

16 / 40

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

17 / 40

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

18 / 40

You must first______to supply air to the trailer.

19 / 40

The emergency air line is used to:

20 / 40

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

21 / 40

Off-tracking happens when going around a corner and:

22 / 40

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

23 / 40

You should back up slowly until____when coupling the trailer.

24 / 40

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

25 / 40

Select the true statement in regards to crossing your air lines on a new trailer with spring brakes

26 / 40

Select the vehicle that off-tracks the most.

27 / 40

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

28 / 40

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

29 / 40

Select the corect setup for shut-off valves:

30 / 40

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

31 / 40

What color and shape is the trailer air supply control?

32 / 40

What should you do if you start a trailer skid?

33 / 40

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

34 / 40

Where are shut-off valves located?

35 / 40

What is the service air line controlled by?

36 / 40

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

37 / 40

What is a king pin?

38 / 40

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

39 / 40

Select the step that comes first:

40 / 40

Remember to_____to prevent rollovers.

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