You supply air to the trailer tanks by:

Loss of air pressure in the emergency line causes:

A tractor with a _ trailer requires the shortest amount of stopping distance.

Which of these statements is true?

If you cannot make a right turn without swinging into another lane, you should:

The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in what air line?

Off tracking or "cheating" causes which of these to follow the widest path while making a turn?

If your vehicle gets stuck on a railroad crossing, you should:

When driving a set of double trailers, it is necessary to close shut-off valves on some trailers. Where are these valves located?

Before you back under a trailer, make sure of what?

To unlock the fifth wheel, you pull the handle to what position?

After connecting the air lines but before backing under the trailer, you should:

You are coupling a tractor to a semi-trailer and you have backed up but are not yet under it. What should you hook up before backing under it?

You are coupling a tractor to a trailer. The trailer is at the right height when:

Why should you connect the air lines to a dummy coupler when they are not in use?

The air leakage rate for a combination vehicle with the engine off and the brakes off should be less than _ per minute.

Air and electric lines from the tractor to the trailer should be:

Air brake equipped trailers made before 1975:

The hand valve should be used:

The air leakage rate for a combination vehicle with the engine off and the brakes on should be less than _ per minute.

Your emergency line breaks or gets pulled apart while driving. The loss of pressure will cause the:

You have pushed in the trailer air supply valve. You should not move the vehicle until the whole system is:

When should you use the hand valve to park a combination vehicle?

The best way to tell that your trailer has started to skid is to:

A trailer is most likely to jackknife when it is:

If the service line comes apart but the emergency line stays together, what will happen right away?

When backing a tractor under a trailer you should:

After you have coupled the trailer, you should begin raising the landing gear using what gear?

You will know the trailer you are using has ABS by:

If you cross the air lines while coupling to an old trailer what will happen?

When should you get out of your vehicle when you are backing a trailer?

When you are uncoupling a loaded trailer, you should lower the landing gear until it:

How much space should be between the upper and lower fifth wheel after coupling?

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

Why should you be sure that the fifth wheel is greased as required?

After you lock the kingpin into the fifth wheel, you check the connection by:

After you supply air to the trailer, make sure the lines are not crossed and the brakes are working. This is done by:

To be safe while driving, you should leave at least 1 second for every of vehicle length as following distance.

Two things you can do to prevent rolling over are keep the cargo as low to the ground as possible, and:

You have a major leak in the service line and you put on the brakes. Service air pressure will escape and if it goes low enough will cause the:

When uncoupling a trailer, after you have locked the trailer brakes, you Should:

When do you need to use chocks to park a trailer that does not have spring brakes?

The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means:

When you get ready to back under a trailer, you should line up:

After you have coupled to a trailer, the tractor protection valve should be placed in the position.

How should you test the trailer connection for security?

The trailer air supply valve should automatically close when air pressure falls to what range?

What part of the kingpin should the jaws be locked around?

The higher your center of gravity of your truck, the:

When checking that the trailer is securely coupled to the tractor, the landing gear should be:

If you must back your trailer on a curved path, you should position your vehicle so you can back:

If your ABS is not working on your trailer, you should:

Compared to a straight truck or bus, there are things to inspect on a combination vehicle.

Air lines are often colored. The emergency line is? The service line is?

To stop a trailer skid you should?

What gear should the transmission be in after you have uncoupled and are inspecting the trailer supports?

You have coupled to a trailer. Where should the landing gear be before driving away?