In general, the higher the center of gravity of your truck, the:

To be safe when driving behind other vehicles under good conditions, you should leave at least one second between your vehicle and the vehicle ahead for each ___ feet of your vehicle's length.

If the spring brakes don't release when you push the trailer air supply control, you should

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

A driver crosses the air lines when hooking up an old trailer. What will happen?

You have coupled with a semi-trailer. Where should you put the front trailer supports before driving away?

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

The best way to tell if your trailer started to skid is:

After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the ____ position

When coupling, the proper position of the fifth wheel

You are coupling a semi-trailer to your tractor but have not backed under it. The trailer is at the right height when:

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

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

The tractor protection valve will close and the trailer emergency brakes will come one when there is a major leak in the ____ brake line.

Before you back under a trailer, make sure the:

How much space should there be between the apron and the fifth wheel after coupling?

You supply air to the trailer tanks by

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

When checking the trailer's emergency brakes, the tractor protection control valves should be placed in the ____ position:

If you cannot make a tir without entering another traffic lane, you should:

The front trailer supports are up and the trailer is resting on the tractor, make sure:

Why should you lock the glad hands to each other (or dummy couplers) when you are not towing a trailer?

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

In normal driving, some drivers use the hand valve before the brake pedal to prevent a jackknife. Which of these statements is TRUE?

Loss of air pressure in the emergency line causes:

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

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

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

When uncoupling a trailer, after you shut off the air supply and locked the trailer brakes, you should;

Air break equipped trailers made before 1975

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

You are driving a combination vehicle when the trailer brakes away pulling apart both air lines. You would expect the trailer brakes to come on and:

You are coupling a tractor and semi-trailer and have connected the air lines. Before backing under the trailer, you should:

A tractor/trailer vehicle combination is more likely to roll over in a tum when the configuration includes:

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

what part of the kingpin should the locking jaws close around ?

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

A trailer is most likely to jackknife when it is:

If service air lines come apart while you are driving a combination vehicle but the emergency lines stay together, what will happen right away?

when connecting the glad hands, press the two seals of the couplers together at a degree angle to one another:

To stop a trailer skid you should:

You should not back a tractor under a trailer until the whole air system is

There are two things that a driver can do to prevent a roll-over. They are (1) go slowly, and (2):

The trailer air supply control (also called the tractor protection valve) should automatically close when air pressure falls between ___ PSI.

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

when backing a tractor/trailer, you should

Glad Hands are use for connecting the

Which of these statements is true?