Combination

Front 1

Glad hand are used for connecting the :

Back 1

Service and emergency air lines from the truck to the trailer

Front 2

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

Back 2

To prevent steering problem

Front 3

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

Back 3

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

Front 4

The trailer air supply control (also called the tractor protection value control) should automatically close when the air pressure falls to between ____psi.

Back 4

20 and 45

Front 5

When coupling the proper position of the fifth wheel is

Back 5

Tilted down towards the end of the tractor

Front 6

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

Back 6

The shank

Front 7

A trailer is most likely to jackknife when it is:

Back 7

Empty

Front 8

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

Back 8

Check the air line connections

Front 9

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

Back 9

See it in your mirrors

Front 10

To unlock the fifth wheel,pull the release handle to the ____ position

Back 10

Open

Front 11

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

Back 11

Never

Front 12

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

Back 12

If the trailer has no springs brakes ,he or she could drive away but wouldn't have trailer brakes

Front 13

You supply air to the trailer tanks by:

Back 13

Pushing in the trailer air supply valve

Front 14

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

Back 14

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

Front 15

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

Back 15

Over the locking lever

Front 16

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 :

Back 16

Applying and releasing the trailer brakes and listening for brake sounds

Front 17

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

Back 17

Nothing is likely to happen until you try to apply the brakes

Front 18

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

Back 18

With the tractor frame under the trailer

Front 19

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

Back 19

Neutral

Front 20

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

Back 20

At normal pressure

Front 21

Which of these statements is true?

Back 21

"Bobtail" tractor can take longer to stop than a combination vehicle loaded to maximum gross weight

Front 22

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

Back 22

It will be raised slightly when the trackor is backed under it

Front 23

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

Back 23

Makes firm contact with the ground and then crank it in low gear a few extra turns

Front 24

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

Back 24

Easier it is to turn over

Front 25

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 foe each ____ feet of your vehicles length

Back 25

10

Front 26

When you get ready to back u see. Trailer, you should line up:

Back 26

Directly in front of the trailer

Front 27

To stop a trailer skid you should

Back 27

Release the service brakes

Front 28

The air leakage rate for a combinations of two vehicle should be greater than ____ psi per min

Back 28

3

Front 29

Before you back under a trailer make sure the :

Back 29

Trailer brakes are locked

Front 30

There are two things that a driver can do to prevent a rollover. The are 1. Go slow around turns 2.

Back 30

Keep cargo as close to the ground as possible

Front 31

After the trailer has been coupling to the tractor, the tractor protection control value should be placed in the ___ position

Back 31

Normal

Front 32

When coupling a trailer after you have shut off the trailer air supply and locked the trailer brakes you should :

Back 32

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

Front 33

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

Back 33

Pulling the tractor ahead gently with the trailer brakes locked

Front 34

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

Back 34

Turn wide as you complete your turn

Front 35

Loss of air pressure in the emergency line causes

Back 35

The trailers emergency brakes to come on

Front 36

In normal driving done drivers use the hand value before the brake pedal to prevent a jackknife. Which of these statement is true?

Back 36

It should not be done

Front 37

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

Back 37

Emergency

Front 38

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

Back 38

Trailer emergency brakes to come on

Front 39

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

Back 39

If the trailer has no spring brakes you could drive away but you would not have trailer brakes

Front 40

You have pushed in the trailer supply value you should not move the tractor until the whole air system is

Back 40

At normal pressure