Combination
Settings
.
- 1.The best way to tell if your trailer has tarted to skid is to:
- A.
Feel for "pulling" in the cab
- B.
Hear the wheels skidding
- C.
See it in your mirrors
- D.
None of the above
- 2.You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
- A.
At normal pressure
- B.
Between 60 and 80 psi
- C.
Empty
- D.
All of the above
- 3.Which part of the kingpin should the locking jaws close around?
- A.
The base
- B.
The shank
- C.
The head
- D.
All of the above
- 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
- A.
30
- B.
20
- C.
10
- D.
All of the above
- 5.Which of these vehicles off-track the most
- A.
5-axle tractor towing a 42-foot trailer
- B.
5-axle tractor towing a 45-foot trailer
- C.
5-axle tractor towing a 52-foot trailer
- D.
None of the above
- 6.A tractor with a (n) ______ trailer requires the shortest stopping distance
- A.
Lightly loaded
- B.
Fully loaded
- C.
Empty
- D.
None of the above
- 7.A trailer is most likely to jackknife when it is
- A.
Empty
- B.
Over loaded
- C.
Loaded to full capacity
- D.
All of the above
- 8.When checking that the trailer is securely coupled to the tractor, the landing gear should be
- A.
Full lowered
- B.
Fully raised
- C.
Slightly raised
- D.
All of the above
- 9.If you have coupled with a semitrailer, where should the front trailer supports be before driving away?
- A.
Raised 3/4 way with the crank handle removed
- B.
Raised 1/2 way with the crank handle secured in its bracket
- C.
Fully raised with the crank handle secured in its bracket
- D.
None of the above
- 10.You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?
- A.
Low revers
- B.
High reverse
- C.
Neutral
- D.
All of the above
- 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)
- A.
Keep both hands firmly on the steering wheel
- B.
Go slow around turns
- C.
Make sure the brakes are properly adjusted
- D.
None of the above
- 12.The fifth wheel locking lever is not locked after the jaws close around the kingpin. this means that
- A.
The parking lock is off and may drive away
- B.
The trailer will not swivel on the fifth wheel
- C.
The coupling is not right and should be fixed before driving the coupled unit
- D.
All of the above
- 13.When you are uncoupling a loaded trailer, lower the landing gear until it
- A.
Makes contact with the ground and lifts the trailer off of the fifth wheel
- B.
Makes firm contact with the ground
- C.
Just reaches the ground
- D.
All of the above
- 14.The front trailer supports are up and the trailer is resting on the tractor. Make sure
- A.
There is enough clearance between the tractor frame and the landing gear
- B.
There is enough clearance between the upper and lower fifth wheel
- C.
The safety latch is in the unlocked position
- D.
All of the above
- 15.Glad hands are used to connect the
- A.
Kingpin from the tractor to the locking jaws on the glide plate
- B.
Electric lines from the truck to the trailer
- C.
Service and emergency air lines from the truck to the trailer
- D.
All of the above
- 16.How much space should be between the upper and lower fifth wheel after coupling
- A.
Just enough to see light through it
- B.
None
- C.
About 1/4 inch
- D.
All of the above
- 17.You should not back a tractor under a trailer until the whole air system is
- A.
At normal pressure
- B.
Empty
- C.
Between 60 and 80 psi
- D.
All of the above
- 18.Compared to a straight truck or bus, there are _____ things to inspect on a combination vehicle
- A.
More
- B.
Fewer
- C.
The same number of
- D.
All of the above
- 19.You are coupling a semitrailer to your tractor but have not backed under it. the trailer is at the right height when
- A.
The kingpin is about 1 1/4 inches above the fifth wheel
- B.
It is raised slightly when the tractor is backed under it
- C.
The end of the kingpin is even with the top of the fifth wheel
- D.
All of the above
- 20.When checking the trailers emergency brakes, the tractor protection control valve should be placed in the _______ position
- A.
Emergency
- B.
Neutral
- C.
Normal
- D.
All of the above
- 21.Which statement is true
- A.
Light vehicles need more braking power to stop than heavy ones
- B.
"bobtail" tractors can take longer to stop than a combination vehicle loaded
- C.
The brake and suspension systems of combination vehicles work best with a light load
- D.
None of the above
- 22.In general, the higher your truck's "center of gravity" the
- A.
Easier it is to turn over
- B.
Easier it is to turn around corners
- C.
More stable it is when turning
- D.
All of the above
- 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?
- A.
Nothing, back up and lock the fifth wheel
- B.
The electrical service cable
- C.
The emergency and service air lines
- D.
All of the above
- 24.Air and electric lines from the tractor to the trailer should be
- A.
Secured, but with enough slack for turns
- B.
Resting on the frame of the tractor
- C.
Pulled tight, with very little slack
- D.
All of the above
- 25.If you cannot make a turn without entering another traffic lane, you should
- A.
Not make that turn
- B.
Turn wide before you start your turn
- C.
Turn wide as you complete your turn
- D.
All of the above
- 26.When should you use chocks to park a trailer not equipped with spiring brakes?
- A.
Only when it will be parked on an incline
- B.
Never
- C.
Always
- D.
All of the above
- 27.When coupling, the proper position of the fifth wheel is
- A.
Tilted down towards the end of the tractor
- B.
Level with the ground
- C.
Tilted up towards the end of the tractor
- D.
All of the above
- 28.To stop a trailer skid you should
- A.
Counter steer
- B.
Use the trailer hand brake
- C.
Release the brake
- D.
All of the above
- 29.After you lock the kingpin into the fifth wheel, you should check the connection by pulling
- A.
The tractor ahead gently with the trailer brakes locked
- B.
Forward 50 feet, turning right, and left
- C.
The tractor ahead sharply to release the trailer brakes
- D.
None of the above
- 30.You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should
- A.
Immediately put on your tractor parking brakes
- B.
Back up gently to ease pressure on the fifth wheel locking jaws
- C.
Begin to lower the trailer landing gear
- D.
All of the above
- 31.To unlock the fifth wheel, pull the release handle to the _______ position
- A.
Closed
- B.
Neutral
- C.
Open
- D.
All of the above
- 32.For a coupling to be completed, the safety catch for the fifth wheel locking lever must be
- A.
Straight up
- B.
Over the locking lever
- C.
Through the locking lever
- D.
None of the above
- 33.Before you back under a truck trailer, make sure the :
- A.
Air supply knob is in
- B.
Air brakes are off
- C.
Trailer brakes are locked
- D.
All of the above
- 34.After you connect the air lines, but before you back under the trailer, you should
- A.
Make sure the trailer brakes are off
- B.
Walk around the rig to be sure it is clear
- C.
Supply air to the trailer system, then pull out the air supply knob
- D.
All of the above
- 35.Why should you be sure that the fifth wheel plate is greased as required?
- A.
To prevent steering problems
- B.
To reduces heat and noise
- C.
To ensure good electrical connection
- D.
None of the above
- 36.After the trailer has been coupled tot he tractor, the tractor protection control valve should be placed in the ________ position
- A.
Up
- B.
Down
- C.
Normal
- D.
All of the above
- 37.After you have coupled the trailer, you should begin raising the landing gear by raising the ______ gear.
- A.
Mid-level
- B.
Low
- C.
High
- D.
Option 4
- 38.When backing a tractor under a trailer you should
- A.
Do it quickly to ensure that the kingpin is locked into the fifth wheel
- B.
Always approach the trailer at a slight angle
- C.
Always use the lowest reverse gear
- D.
All of the above
- 39.Why should you lick the air line glad hands to each other (or dummy couplers) when you are not towing a trailer?
- A.
It will keep water out of the lines
- B.
If you do not, you could never build system pressure
- C.
The connected brake circuit becomes a back up air tank
- D.
All of the above
- 40.When you get ready to back under a semitrailer, you should line up
- A.
The left rear outside dual wheel with the kingpin
- B.
The kingpin with the edge of the drivers side locking jaw
- C.
Directly in front of the trailer
- D.
All of the above
- 41.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
- A.
Applying/releasing the trailer brakes and listening for brake sounds
- B.
Turning on the parking brakes from the cab
- C.
Watching your mirrors to see if the trailer lights come on
- D.
All of the above
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