CDL Combination
Vehicles Test

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

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

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

Select the false statement about tractor protection valves.

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

Select the corect setup for shut-off valves:

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

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

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.

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

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

Remember to_____to prevent rollovers.

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

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

You should make sure the_____before backing under a trailer.

The emergency air line is used to:

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

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

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

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

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

Select the vehicle that off-tracks the most.

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

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

Select the true statement:

Check to ensure that____when inspecting the coupling.

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

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

Select the answer that is controlled by the foot brake.

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

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

The front trailer supports should be____before driving away.

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

What should you do before you begin to couple?

The purpose for the emergency air line is:

You should expect____when backing a tractor under a trailer.

Where are shut-off valves located?

What is the service air line controlled by?

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

What should you hook up before backing a tractor to a trailer for coupling?