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

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

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

There are two things that a driver can do to prevent a rollover. They are (1) keep the cargo as close to the ground as possible; and (2) :

When backing a tractor under a trailer you should

The semitrailer made before 1975 that are equipped with the air brakes:

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

If you cannot make a turn without entering another traffic lane:

How should you test the tractor-semitrailer connection for security?

You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:

The safest way to make a turn without entering another traffic lane is:

When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:

When checking the trailer emergency brakes the tractor protection control valve should be placed in what position?

The air brake leakage rate for a combination vehicle( engine off, brakes off) should be less than ___ psi per minute.

To unlock the fifth wheel the locking lever should be placed in the _____ position.

After you have coupled the trailer you should have to raise the landing gear by using:

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

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

While driving behind other vehicle under good condition you should allow at least one second between your vehicle and the vehicle ahead for each _____ (how many) feet of your vehicle length?

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

Off-tracking or cheating causes of which of these to follow the wider pass while making a turn?

What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?

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

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

While checking if the trailer is securely coupled to the trailer the landing gears should be

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

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

If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?

You supply air to the trailer tanks by:

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

You are about to back your tractor under a semitrailer. The trailer is at right height when the :

You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer you should:

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

The air lines on a combination vehicles are often colored to prevent them from mixing up. The emergency line is ______, the service line is ______.

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

Where should the tractor be when you inspect landing gear uncoupling the trailer?

Glad hands are usually connecting which of these?

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

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

You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away?

To stop a trailer skid you should:

What will happen if the air lines are crossed when you hook up to an old trailer ?

Before you back under a trailer, make sure that:

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

If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away ?

Off-tracking or cheating causes of which of these to follow the wider pass while making a turn?

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

Why should you lock the tractor 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 :

Air brake equipped trailers made before 1975:

Compared to a straight truck or bus there are _____ things to inspect in a combination vehicle.

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

The air leakage rate for a combination vehicle (engine off, brakes on) should be less than ____ psi per minute

When driving a set of doubles it is necessary to close which shut off valve in the last trailer.

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

The hand valve should be used

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

If the brakes are not released when you pushed the trailer air supply valve you should:

When connecting the glad hands press the two seals with the couple together at what degree to each other?

When coupling, the proper position of the fifth wheel is:

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

Which of these statements is true?

There are two things that a driver can do to prevent a rollover. They are (1) go slow around turns ; (2):

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

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

Your emergency air lines breaks or gets pulled apart while you are driving. The loss of pressure will cause the :