Combination

Question 1

Which statement is true?

Answer 1

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

Question 2

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

Answer 2

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

Question 3

Under good driving conditions, you should leave at least one second of space between you vehicle and the vehicle ahead for every ___ feet of vehicle’s length

Answer 3

10 ft

Question 4

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?

Answer 4

The emergency and service air lines

Question 5

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

Answer 5

The Shank

Question 6

To stop a trailer skid you should:

Answer 6

release the brakes

Question 7

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

Answer 7

Always

Question 8

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

Answer 8

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

Question 9

To unlock the fifth wheel, put the release handle to the ___ position.

Answer 9

Open

Question 10

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

Answer 10

Secured, but with enough slack for turns

Question 11

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

Answer 11

over the locking lever

Question 12

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

Answer 12

To prevent steering problems

Question 13

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

Answer 13

At normal pressure

Question 14

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

Answer 14

Turn wide as you complete your turn

Question 15

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

Answer 15

Tilted down towards the end of the tractor

Question 16

A tractor with an ___ trailer requires the shortest stopping distance.

Answer 16

Fully loaded

Question 17

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

Answer 17

The tractor ahead gently with the trailer brakes locked

Question 18

In general, the higher you truck’s “center of gravity”the:

Answer 18

Easier it is to turn over

Question 19

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

Answer 19

None

Question 20

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

Answer 20

Slightly raised

Question 21

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

Answer 21

Neutral

Question 22

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

Answer 22

It is raised slightly when the tractor is backed under it

Question 23

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

Answer 23

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

Question 24

When checking the trailers emergency brakes, the tractor protection control valve should be placed in the ___ position

Answer 24

Emergency

Question 25

There are two things that can prevent a rollover. They are: Keep the cargo as close to the ground as possible; and :

Answer 25

Go slow around turns

Question 26

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

Answer 26

At normal pressure

Question 27

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

Answer 27

See it in your mirrors

Question 28

Which one of thesr vehicles off-track the most?

Answer 28

5-axle tractor towing a 52-foot trailer

Question 29

Glad hands are used to connect the:

Answer 29

Service and the emergency air lines from the truck to the trailer

Question 30

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

Answer 30

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

Question 31

A trailer is most likely to jackknife when it is:

Answer 31

Empty

Question 32

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

Answer 32

Fully raised with the crack handle secured in its bracket

Question 33

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

Answer 33

makes firm contact with the ground and lifts the trailer off of the fifth wheel

Question 34

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

Answer 34

More

Question 35

To unlock he fifth wheel, pull the release handle to the ___ position

Answer 35

Open

Question 36

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

Answer 36

It will keep water out of the lines

Question 37

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

Answer 37

Low

Question 38

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

Answer 38

Normal

Question 39

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

Answer 39

To prevent steering problems

Question 40

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

Answer 40

Applying/releasing the trailer brakes and listening for brake sounds

Question 41

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

Answer 41

Directly in front of the trailer

Question 42

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

Answer 42

The tractor ahead gently with the trailer brakes locked

Question 43

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

Answer 43

Turn wide as you complete you turn

Question 44

When backing a tractor under a trailer you should:

Answer 44

Always use the lowest reverse gear

Question 45

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

Answer 45

Trailer brakes are on