Combination

Question 1

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

Answer 1

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

Question 2

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

Answer 2

At a normal pressure

Question 3

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

Answer 3

The Shank

Question 4

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

Answer 4

Directly in front of the trailer

Question 5

How should you test the tractor semi trailer connection security?

Answer 5

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

Question 6

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

Answer 6

Never

Question 7

You supply air to the trailer tanks by?

Answer 7

Pushing in the trailer air supply valve

Question 8

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

Answer 8

To prevent steering problems

Question 9

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?

Answer 9

Applying and releasing the trailer breaks and listening for brake sounds

Question 10

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

Answer 10

Go slowly around turns

Question 11

Before you back under a trailer, make sure the:

Answer 11

Trailer brakes are locked

Question 12

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

Answer 12

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

Question 13

The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than ___psi per minute.

Answer 13

4

Question 14

In normal driving, some driver use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statement is true?

Answer 14

If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes

Question 15

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

Answer 15

It will keep dirt and water out of the lines

Question 16

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

Answer 16

Over the locking lever

Question 17

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

Answer 17

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

Question 18

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

Answer 18

Trailer emergency brakes to come on

Question 19

When backing under a tractor under a trailer you should expect?

Answer 19

Trailer will be lifted slightly when the tractor backs under it

Question 20

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

Answer 20

The driver crosses the air lines when hooking up to an old trailer. What will happen? If the trailer has no spring brakes, you can drive away, but you will not have trailer brakes

Question 21

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

Answer 21

The emergency and service air lines

Question 22

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

Answer 22

Emergency Line: Red
Service Line: Blue

Question 23

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

Answer 23

True

Question 24

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

Answer 24

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

Question 25

The hand valve should be used?

Answer 25

To test the trailer brakes

Question 26

The air leakage rate for a combination vehicle (engine off, brakes off) should ben o more than ___psi per minute.

Answer 26

3

Question 27

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

Answer 27

The coupling is not right and should be fixed before driving the vehicle.

Question 28

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

Answer 28

The tractor protection valve to close

Question 29

Semi trailer made before 1975 that are equipped with air brakes

Answer 29

Often do not have spring brakes

Question 30

Almost half of all truck driver deaths are the result of ?

Answer 30

Rollovers

Question 31

What sentence best explains “crack the whip effect”?

Answer 31

When you make a quick lane change or sudden movement with your steering wheel the rear trailer tends to swing out. The force of the rear trailer becomes amplified causing it to roll over (rearward amplification)

Question 32

Which type of truck-trailer combination has the best chance of the “crack the whip” rollover?

Answer 32

A tractor pulling 3 trailers

Question 33

Which trailers are most likely to get stuck on railroad tracks? (Pick 3)

Answer 33

1. Lowbody tailers. A low slung unit 2. Possum-belly livestock trailers A low slung unit 3. Single axle tractors pulling a short trailers. A low slung unit

Question 34

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

Answer 34

With the tractor frame under the trailer

Question 35

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.

Answer 35

10

Question 36

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

Answer 36

You should turn wide as you complete the turn

Question 37

In general, the higher your truck’s center of gravity, the?

Answer 37

Easier it is to turn over

Question 38

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

Answer 38

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

Question 39

Glad hands are used to connect the?

Answer 39

Service and Emergency air lines from the truck and the trailer

Question 40

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

Answer 40

If the trailer has no spring brakes, you could drive away but you wouldn’t have trailer brakes

Question 41

The hand valve should be used?

Answer 41

To test the trailer brakes

Question 42

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

Answer 42

Back

Question 43

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

Answer 43

Emergency trailer brakes to come on

Question 44

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

Answer 44

None

Question 45

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

Answer 45

Check air line connection

Question 46

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

Answer 46

At normal pressure

Question 47

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

Answer 47

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

Question 48

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

Answer 48

Low gear

Question 49

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

Answer 49

90 degrees

Question 50

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

Answer 50

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

Question 51

When you are coupling a loaded trailer lower the landing gear until it?

Answer 51

Makes firm contact with the ground

Question 52

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

Answer 52

Titled down toward the end of tractor

Question 53

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

Answer 53

Secured, but with enough slack for turns

Question 54

When backing a tractor under a trailer you should?

Answer 54

Always use lowest reverse gear

Question 55

Compared to a straight truck or bus there are ____ things to inspect in combination vehicles.

Answer 55

More

Question 56

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

Answer 56

Fully raised with the crank handle secured in its bracket

Question 57

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

Answer 57

Slightly raised

Question 58

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

Answer 58

The tractor ahead gently with the trailer brakes locked

Question 59

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

Answer 59

Normal

Question 60

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

Answer 60

Emergency

Question 61

To unlock the fifth wheel, pull the release handle to the ____position

Answer 61

Open

Question 62

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

Answer 62

Triple towing a 45-feet trailer

Question 63

To stop a trailer skid you should?

Answer 63

Release the brakes

Question 64

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

Answer 64

Never

Question 65

When checking the trailer emergency brakes on the tractor protection control valve should be placed in the _____position?

Answer 65

Emergency

Question 66

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

Answer 66

Neutral

Question 67

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

Answer 67

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

Question 68

Combination vehicles are usually heavier, longer and require more driving skill than single commercial vehicles

Answer 68

True

Question 69

More than half of truck driver deaths in crashes are the result of rollovers. Trucks turn over easier when fully loaded and are?

Answer 69

Ten times more likely to rollover in a crash than empty rigs

Question 70

When you turn suddenly while pulling doubles, which trailer is most likely to turn over?

Answer 70

The rear trailer is twice as likely to turn over as the tractor

Question 71

Why should you not use the trailer hand brake to straighten out a jackknifing trailer?

Answer 71

Because the brakes on the trailer wheels cause the skid in the first place

Question 72

What is the tractor jackknife?

Answer 72

When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continuous to push forward

Question 73

Your should swing wide to the left before starting a 90 degree turn to the right?

Answer 73

No

Question 74

Why should you not use the trailer hand valve while driving?

Answer 74

Because of the danger of making the trailer skid

Question 75

Describe what the trailer air supply control does

Answer 75

It is used to supply the trailer with air, shut the air off, and put on the trailer emergency brakes

Question 76

Describe what the service line is for?

Answer 76

To carry air to a relay valve that allows the trailer brakes to be applied quickly

Question 77

What are the other names for the Service Air Line?

Answer 77

Control Line and Signal Line

Question 78

What is the emergency air line?

Answer 78

Air lines that control the emergency brakes on combination vehicles

Question 79

What is the Emergency Air Line for?

Answer 79

To engage the trailer brakes in the case of air pressure loss.

Question 80

Why should you use chocks when parking a trailer without spring breaks?

Answer 80

Because of the air pressure leaks away or down, there will be no brakes

Question 81

When a vehicle is carrying a load at night, which extends four feet or more beyond the rear of the body, there must be ____ at the extreme end of the load

Answer 81

2 Red Lights

Question 82

How long does it take a typical tractor trailer to clear a single track? A double track?

Answer 82

It takes 14 seconds to clear a single track, and more than 15 seconds to clear a double track

Question 83

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

Answer 83

At Normal pressure

Question 84

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

Answer 84

See it in your mirrors

Question 85

Which of these vehicles off-track the most?

Answer 85

5-axle tractor towing a 52-foor trailer

Question 86

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

Answer 86

Fully Loaded

Question 87

A Trailer is most likely to Jackknife when it is?

Answer 87

Empty

Question 88

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

Answer 88

Fully raised with the crank handle secured in the bracket

Question 89

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

Answer 89

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

Question 90

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

Answer 90

Neutral

Question 91

When should you use chocks to park a trailer not equipped with Spring breaks?

Answer 91

Always