Combination

Front 1

On a tractor, where is the yellow antilock brake (ABS) malfunction lamp located?

Back 1

On the left front or left rear corner

Front 2

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

Back 2

It will be raised slightly when the tractor is backed under it.

Front 3

Trucks roll over more easily when fully loaded and are

Back 3

Ten times more likely to roll over in a crash than empty rigs

Front 4

The service line

Back 4

Carries air to relay valve that allows the trailer brakes to be applied quickly.

Front 5

To stop a trailer skid, you should?

Back 5

Release the brakes

Front 6

What is the safety way for you to make a turn without you entering another traffic lane?

Back 6

You should turn wide as you complete the turn.

Front 7

To test the tractor protection valve, charge the trailer air brake system, turn of the engine, and

Back 7

Step on and off the brake pedal several times

Front 8

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

Back 8

At normal pressure

Front 9

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

Back 9

Supply air to the trailer system and then pull out the air supply knob.

Front 10

On a double or triple vehicle, which wheels off track the most?

Back 10

The rear wheels of the last trailer

Front 11

When you get ready to back under the semi-trailer, you should line up

Back 11

Directly in front of the trailer

Front 12

What is the emergency air line?

Back 12

Air lines that control the emergency brakes on combination vehicles

Front 13

You are coupling a tractor to a semi-trailer. You have backed up but are not yet under it. Before backing under the semi-trailer, you should hook up

Back 13

The emergency and service air lines

Front 14

If you do not do the final air brake check for air leaks and fix them before driving,

Back 14

You could lose your brakes while driving.

Front 15

If your vehicle gets stuck on a railroad track, you should

Back 15

Get away from your vehicle and call 911 or posted emergency number

Front 16

To drive a triple combination vehicle, you must have

Back 16

A class A CDL with double/triple (T) endorsement

Front 17

An antilock braking system (ABS) is useful

Back 17

Whether it is on a tractor or the trailers

Front 18

Before you back under a trailer, make sure that

Back 18

The trailer brakes are locked

Front 19

When you test the tractor protection valve, the red air supply control knob should go into the __________ position.

Back 19

Emergency

Front 20

You have a major leak in the service line, and you apply the brakes. Service air pressure will escape and cause the

Back 20

Trailer emergency brake to come on.

Front 21

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

Back 21

Never

Front 22

While you are driving, your emergency air line breaks or gets pulled apart. The loss of pressure would cause the

Back 22

Trailer emergency brakes to come on.

Front 23

Semi-trailers made before 1975 that are equipped with air brakes

Back 23

Often dont have spring brakes.

Front 24

When backing a tractor under a trailer, you should expect that

Back 24

The trailer will be lifted slightly when the tractor backs under it.

Front 25

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

Back 25

Pull gently forward in low gear against the locked trailer brakes, then look at it carefully

Front 26

At night, when a vehicle is carrying a load that extends four feet more beyond the rear of the body, there must be______at the extreme end of the load

Back 26

Red lights

Front 27

To prevent rollover, cargo should be

Back 27

spread evenly across the rig and as low as possible

Front 28

If you have coupled with a semi-trailer, where should you put the front trailer support before driving away?

Back 28

Fully raised with crank handle secured in its bracket.

Front 29

Back 29

B

Front 30

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

Back 30

Emergency

Front 31

If the brakes did not release when you pushed the trailer air Supply valve, you should

Back 31

Check the air line connections

Front 32

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

Back 32

The coupling is not right and should be fixed before you drive the coupled unit.

Front 33

What is another names for the service air line?

Back 33

Control and signal air lines

Front 34

The iron trailer supports are up, and the trailer is resting on the tractor. Make sure that

Back 34

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

Front 35

Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ______ ; the service line is ______ .

Back 35

Red and blue

Front 36

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

Back 36

See it in the mirrors.

Front 37

You Supply air to the trailer tank by

Back 37

Pushing the trailer air Supply control

Front 38

Glad hand are used to connect the

Back 38

Service and emergency air lines from the truck or tractor to the trailer.

Front 39

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

Back 39

Over the lock lever

Front 40

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

Back 40

10

Front 41

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

Back 41

Makes firm contact with the ground.

Front 42

Low-slung vehicles can be risky at railroad crossings because

Back 42

They are more likely to get stuck on raised railroad crossings.

Front 43

When connecting the glad hands, press the two seals together with the couplers at what angle to each other?

Back 43

90 degree