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

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

2 / 40

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

3 / 40

Select the vehicle that off-tracks the most.

4 / 40

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

5 / 40

The locking jaws of the kingpin should close around:

6 / 40

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

7 / 40

How should the hand valve be used?

8 / 40

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

9 / 40

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

10 / 40

You should____in order to inspect the coupling.

11 / 40

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

12 / 40

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

13 / 40

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

14 / 40

When should the trailer hand valve be used?

15 / 40

Make sure that____when the front trailer supports are up and the trailer is resting on the tractor.

16 / 40

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

17 / 40

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

18 / 40

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

19 / 40

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

20 / 40

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

21 / 40

You need to raise the landing gear just to the height of where it clears the pavement before driving.

22 / 40

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

23 / 40

Select the definition of "off-tracking."

24 / 40

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

25 / 40

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

26 / 40

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

27 / 40

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

28 / 40

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

29 / 40

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

30 / 40

Off-tracking happens when going around a corner and:

31 / 40

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

32 / 40

You should expect____when backing a tractor under a trailer.

33 / 40

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

34 / 40

What is the service air line controlled by?

35 / 40

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

36 / 40

Check to ensure that____when inspecting the coupling.

37 / 40

It is good practice to_____when uncoupling.

38 / 40

Where are shut-off valves located?

39 / 40

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

40 / 40

You should back up slowly until____when coupling the trailer.

Your score is

The average score is 70%

5/5 - (3 votes)

CDL Category Practice Tests