CDL Combination
Vehicles Test

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

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

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

Select the vehicle that off-tracks the most.

Select the true statement in regards to large combination vehicles taking longer to stop.

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

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

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

What is the earliest way to notice a trailer skid?

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

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

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

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

When not towing a trailer, why should the tractor glad hands be locked?

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.

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

The cause of almost half of all truck driver deaths are:

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

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

How should the trailer be lined up when preparing to back the tractor up?

It is good practice to_____when uncoupling.

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

How do you supply air to the trailer tanks?

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

The emergency air line is used to:

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

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

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

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

The trailer should be lowered so that _____.

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

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

To test the security of the tractor semi trailer connection you should:

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

How should the hand valve be used?

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

Select the true statement:

Remember to_____to prevent rollovers.

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

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