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

It is good practice to_____when uncoupling.

2 / 40

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

3 / 40

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

4 / 40

Select the reason as to why you should not use the trailer hand valve while driving.

5 / 40

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

6 / 40

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

7 / 40

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

8 / 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:

9 / 40

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

10 / 40

What should you do before you begin to couple?

11 / 40

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

12 / 40

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

13 / 40

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

14 / 40

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

15 / 40

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

16 / 40

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

17 / 40

Select what you should not do when coupling the glad hands.

18 / 40

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

19 / 40

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

20 / 40

Select the vehicle that off-tracks the most.

21 / 40

The purpose for the emergency air line is:

22 / 40

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

23 / 40

What is a king pin?

24 / 40

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

25 / 40

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

26 / 40

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

27 / 40

You must first______to supply air to the trailer.

28 / 40

Select the answer that is controlled by the foot brake.

29 / 40

How high should you crank the landing gear?

30 / 40

How should the hand valve be used?

31 / 40

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

32 / 40

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

33 / 40

You should____in order to inspect the coupling.

34 / 40

Check to ensure that____when inspecting the coupling.

35 / 40

Select the true statement:

36 / 40

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

37 / 40

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

38 / 40

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

39 / 40

When should the trailer hand valve be used?

40 / 40

What should you do if you start a trailer skid?

Your score is

The average score is 0%

5/5 - (3 votes)

CDL Category Practice Tests