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

When driving normally, some drivers use the hand valve before applying the brake pedal to prevent jack knifing. Select the most appropriate response to this statement.

2 / 40

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

3 / 40

The purpose for the emergency air line is:

4 / 40

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

5 / 40

Make sure that_____before you back under a trailer.

6 / 40

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

7 / 40

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

8 / 40

Select the false statement about tractor protection valves.

9 / 40

You must first______to supply air to the trailer.

10 / 40

What should you do before you begin to couple?

11 / 40

Select the true statement:

12 / 40

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

13 / 40

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

14 / 40

How should the hand valve be used?

15 / 40

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

16 / 40

Select the answer that is controlled by the foot brake.

17 / 40

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

18 / 40

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

19 / 40

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

20 / 40

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

21 / 40

What is the earliest way to notice a trailer skid?

22 / 40

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

23 / 40

You should make sure the_____before backing under a trailer.

24 / 40

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

25 / 40

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

26 / 40

Select the true statement:

27 / 40

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

28 / 40

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

29 / 40

How should the hand valve be used?

30 / 40

The front trailer supports should be____before driving away.

31 / 40

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

32 / 40

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

33 / 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:

34 / 40

What color and shape is the trailer air supply control?

35 / 40

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

36 / 40

The trailer should be lowered so that _____.

37 / 40

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

38 / 40

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

39 / 40

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

40 / 40

Off-tracking happens when going around a corner and:

Your score is

The average score is 70%

5/5 - (3 votes)

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