Class A Combination

Front 1

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

Back 1

See it in your mirrors

Front 2

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

Back 2

At normal pressure

Front 3

A trailer is most likely to jackknife when it is:

Back 3

Empty

Front 4

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

Back 4

The coupling is not right and should be fixed before driving the coupled unit

Front 5

Glad hands are used to connect the:

Back 5

Service and emergency air lines from the truck to the trailer

Front 6

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

Back 6

It is raised slightly when the tractor is under it

Front 7

Which of these vehicles off-track the most?

Back 7

5-axle tractor towing a 52-foot trailer

Front 8

Under good driving conditions, you should leave at least one second space between your vehicle and the vehicle ahead for every _____ feet of your vehicles length.

Back 8

10

Front 9

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

Back 9

Slightly raised

Front 10

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

Back 10

None

Front 11

If you have coupled with a semitrailer, where should the front trailer supports be before driving away?

Back 11

Fully raised with the crank handle secured in its bracket

Front 12

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

Back 12

Makes contact with the ground and lifts the trailer off of the fifth wheel

Front 13

A tractor with a(n) _____ trailer requires the shortest stopping distance.

Back 13

Fully loaded

Front 14

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

Back 14

The shank

Front 15

There are two things that can prevent a rollover. They are 1) Keep the cargo as close to the ground as possible. And 2):

Back 15

Go slow around turns

Front 16

When checking the trailer’s emergency brakes, the tractor protection control valve should be placed In the _____ position.

Back 16

Emergency

Front 17

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

Back 17

At normal pressure

Front 18

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

Back 18

There is enough clearance between the tractor frame and the landing gear

Front 19

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

Back 19

More

Front 20

You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?

Back 20

Neutral

Front 21

in general, the higher your truck’s “center of gravity” the:

Back 21

Easier it is to turn over

Front 22

You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should:

Back 22

Back up gently to ease pressure on the fifth wheel locking jaws

Front 23

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

Back 23

Turn wide as you complete your turn

Front 24

For a coupling to be completed, the safety catch for the fifth wheel locking lever must be

Back 24

Over the locking lever

Front 25

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

Back 25

Tilted down towards the end of the tractor

Front 26

Before you back under a truck trailer, make sure the:

Back 26

Trailer brakes are locked

Front 27

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

Back 27

The tractor ahead gently with the trailer brakes locked

Front 28

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

Back 28

Secured, but with enough slack for turns

Front 29

To stop a trailer skid you should:

Back 29

Release the brake

Front 30

When should you use shocks to park a trailer not equipped with spring brakes?

Back 30

Always

Front 31

To unlock the fifth wheel, pull the release handle to the ______ position.

Back 31

Open

Front 32

Which statement is true?

Back 32

“Bobtail” tractors can take longer to stop than a combination vehicle loaded to maximum gross weight

Front 33

After you connect the air lines, but before you back under the trailer, you should:

Back 33

Supply air to the trailer system, then pull out the air supply knob

Front 34

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

Back 34

The emergency and service air lines

Front 35

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

Back 35

To prevent steering problems

Front 36

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

Back 36

More

Front 37

When backing a tractor under a trailer you should:

Back 37

Always use the lowest reverse gear

Front 38

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

Back 38

It will keep water out of the lines

Front 39

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

Back 39

Normal

Front 40

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

Back 40

Directly in front of the trailer

Front 41

After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. You do this by:

Back 41

Applying / releasing the trailer brakes and listening for brake sounds

Front 42

After you have coupled the trailer, you should begin raising the landing gear by using the ____ gear.

Back 42

Low