Combination

Question 1

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

Accepted Answer

See it in your mirrors

Answer

Feel for "pulling" in the cab

Answer

Hear the wheels skidding

Answer

None of the above

Question 2

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

Accepted Answer

at normal pressure

Answer

between 60 and 80 psi

Answer

empty

Answer

all of the above

Question 3

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

Accepted Answer

the shank

Answer

the base

Answer

the head

Answer

all of the above

Question 4

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

Accepted Answer

10

Answer

30

Answer

20

Answer

all of the above

Question 5

which of these vehicles off-track the most

Accepted Answer

5-axle tractor towing a 52-foot trailer

Answer

5-axle tractor towing a 42-foot trailer

Answer

5-axle tractor towing a 45-foot trailer

Answer

none of the above

Question 6

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

Accepted Answer

fully loaded

Answer

lightly loaded

Answer

empty

Answer

none of the above

Question 7

a trailer is most likely to jackknife when it is

Accepted Answer

empty

Answer

over loaded

Answer

loaded to full capacity

Answer

all of the above

Question 8

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

Accepted Answer

slightly raised

Answer

full lowered

Answer

fully raised

Answer

all of the above

Question 9

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

Accepted Answer

fully raised with the crank handle secured in its bracket

Answer

raised 3/4 way with the crank handle removed

Answer

raised 1/2 way with the crank handle secured in its bracket

Answer

none of the above

Question 10

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

Accepted Answer

neutral

Answer

low revers

Answer

high reverse

Answer

all of the above

Question 11

There are two things that can prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2)

Accepted Answer

go slow around turns

Answer

keep both hands firmly on the steering wheel

Answer

make sure the brakes are properly adjusted

Answer

none of the above

Question 12

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

Accepted Answer

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

Answer

the parking lock is off and may drive away

Answer

the trailer will not swivel on the fifth wheel

Answer

all of the above

Question 13

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

Accepted Answer

makes firm contact with the ground

Answer

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

Answer

just reaches the ground

Answer

all of the above

Question 14

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

Accepted Answer

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

Answer

there is enough clearance between the upper and lower fifth wheel

Answer

the safety latch is in the unlocked position

Answer

all of the above

Question 15

glad hands are used to connect the

Accepted Answer

service and emergency air lines from the truck to the trailer

Answer

kingpin from the tractor to the locking jaws on the glide plate

Answer

electric lines from the truck to the trailer

Answer

all of the above

Question 16

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

Accepted Answer

none

Answer

just enough to see light through it

Answer

about 1/4 inch

Answer

all of the above

Question 17

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

Accepted Answer

at normal pressure

Answer

empty

Answer

between 60 and 80 psi

Answer

all of the above

Question 18

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

Accepted Answer

more

Answer

fewer

Answer

the same number of

Answer

all of the above

Question 19

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

Accepted Answer

it is raised slightly when the tractor is backed under it

Answer

the kingpin is about 1 1/4 inches above the fifth wheel

Answer

the end of the kingpin is even with the top of the fifth wheel

Answer

all of the above

Question 20

when checking the trailers emergency brakes, the tractor protection control valve should be placed in the _______ position

Accepted Answer

emergency

Answer

neutral

Answer

normal

Answer

all of the above

Question 21

which statement is true

Accepted Answer

"bobtail" tractors can take longer to stop than a combination vehicle loaded

Answer

light vehicles need more braking power to stop than heavy ones

Answer

the brake and suspension systems of combination vehicles work best with a light load

Answer

none of the above

Question 22

In general, the higher your truck's "center of gravity" the

Accepted Answer

easier it is to turn over

Answer

easier it is to turn around corners

Answer

more stable it is when turning

Answer

all of the above

Question 23

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?

Accepted Answer

the emergency and service air lines

Answer

nothing, back up and lock the fifth wheel

Answer

the electrical service cable

Answer

all of the above

Question 24

air and electric lines from the tractor to the trailer should be

Accepted Answer

secured, but with enough slack for turns

Answer

resting on the frame of the tractor

Answer

pulled tight, with very little slack

Answer

all of the above

Question 25

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

Accepted Answer

turn wide as you complete your turn

Answer

not make that turn

Answer

turn wide before you start your turn

Answer

all of the above

Combination

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

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

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

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

Which of these vehicles off-track the most

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

A trailer is most likely to jackknife when it is

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

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

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

There are two things that can prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2)

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

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

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

Glad hands are used to connect the

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

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

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

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

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

Which statement is true

In general, the higher your truck's "center of gravity" the

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?

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

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

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

When coupling, the proper position of the fifth wheel is

To stop a trailer skid you should

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

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

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

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

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

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

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

After the trailer has been coupled tot he tractor, the tractor protection control valve should be placed in the ________ position

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

When backing a tractor under a trailer you should

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

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

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