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

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

2 / 40

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

3 / 40

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

4 / 40

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

5 / 40

The locking jaws of the kingpin should close around:

6 / 40

Which trailer is most likely to turn over when you make a sudden turn while pulling doubles?

7 / 40

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

8 / 40

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

9 / 40

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

10 / 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:

11 / 40

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

12 / 40

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

13 / 40

How should the hand valve be used?

14 / 40

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

15 / 40

Select the answer that is controlled by the foot brake.

16 / 40

You should back up slowly until____when coupling the trailer.

17 / 40

Select the definition of "off-tracking."

18 / 40

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

19 / 40

The trailer should be lowered so that _____.

20 / 40

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

21 / 40

The safety catch for the fifth wheel locking lever must be ____ for a coupling to be complete.

22 / 40

Check to ensure that____when inspecting the coupling.

23 / 40

How high should you crank the landing gear?

24 / 40

Select the statement that describes how you could damage the landing gear.

25 / 40

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

26 / 40

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

27 / 40

You should follow behind other vehicles ______when traveling under 40 mph.

28 / 40

Make sure that_____before you back under a trailer.

29 / 40

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

30 / 40

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

31 / 40

You should make sure the_____before backing under a trailer.

32 / 40

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

33 / 40

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

34 / 40

What color and shape is the trailer air supply control?

35 / 40

Select the corect setup for shut-off valves:

36 / 40

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

37 / 40

Select the true statement:

38 / 40

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

39 / 40

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

40 / 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:

Your score is

The average score is 70%

5/5 - (3 votes)

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