CDL Combination
Vehicles Test

Select the definition of "off-tracking."

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

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

Off-tracking happens when going around a corner and:

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

Select the corect setup for shut-off valves:

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

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

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

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

The locking jaws of the kingpin should close around:

Select the step that comes first:

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

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

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

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

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

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

What color and shape is the trailer air supply control?

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

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

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

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

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

You should make sure the_____before backing under a trailer.

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

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

It is good practice to_____when uncoupling.

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

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

How should the hand valve be used?

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

When you have a major leak in the service line and you apply pressure to the brakes, the service air pressure will escape and:

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

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

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

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

What is the service air line controlled by?

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

The purpose for the emergency air line is: