The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
a. The coupling is not right and should be fixed before driving the coupled unit
b. The trailer will not swivel on the fifth wheel
c. The parking lock is off and may drive away
a. The coupling is not right and should be fixed before driving the coupled unit
Which of these vehicles off-track the most?
a. 5 axle tractor towing a 42 foot trailer
b. 5 axle tractor towing a 52 foot trailer
c. 5 axle tractor towing a 45 foot trailer
b. 5 axle tractor towing a 52 foot trailer
Compared to a straight truck or bus, there are ____ things to inspect on a combination vehicle.
a. Fewer
b. More
c. The same amount of
b. More
Glad hands are used to connect the:
a. Kingpin from the tractor towing the locking jaws on the glide plate
b. Service and emergency air lines from the truck to the trailer
c. Electric lines form the truck to the trailer
b. Service and emergency air lines form the truck to the trailer
Which part of the kingpin should the locking jaws close around?
a. The head
b. The base
c. The shank
c. The shank
When checking that the trailer is securely coupled to the tractor, the landing gear should be:
a. Slightly raised
b. Fully raised
c. Fully lowered
b. Fully raised
You went to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?
a. Neutral
b. Low reverse
c. High reverse
a. Neutral
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. Go slow around turns
b. Keep both hands firmly on the steering wheel
c. Make sure the brakes are properly adjusted
a. Go slow around turns
A trailer is most likely to jackknife when it is:
a. Overloaded
b. Empty
c. Loaded to full capacity
b. Empty
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
b. It is raised slightly when the tractor is backed under it
When checking the trailers emergency brakes, the tractor protection control valve should be placed in the ____ position.
a. Emergency
b. Neutral
c. Normal
a. Emergency
When you are uncoupling a loaded trailer, lower the landing gear until it:
a. Makes firm contact with the ground
b. Just reached the ground
c. Makes contact with the ground and lift the trailer off of the fifth wheel
a. Makes firm contact with the ground
You should not back a tractor under a trailer until the whole air system is:
a. At normal pressure
b. Between 60 and 80 psi
c. Empty
c. Empty
How much space should be between the upper and lower fifth wheel after coupling?
a. About 1/4 inch
b. None
c. Just enough to see light through it
b. None
Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead of every ___ feet of your vehicle’s length?
a. 20
b. 30
c. 10
c. 10
A tractor with a(n) _____ trailer requires the shortest stopping distance.
a. Empty
b. Fully loaded
c. Lightly loaded
b. Fully loaded
The best way to tell if your trailer has started to skid is to:
a. See it in your mirrors
b. Feel for “pulling” in the cab
c. Hear the wheels skidding
a. See it in you mirrors
You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
a. Between 60 and 80 psi
b. At normal pressure
c. Empty
b. At normal pressure
If you have coupled with a semitrailer, where should the front trailer supports be before driving away?
a. Raised 1/2 way with the crank handle secured in its bracket
b. Fully raised with the crank handle secured in its bracket
c. Raised 3/4 way with the crank handle removed
b. Fully raised with the crank handle secured in its bracket
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. The safety latch is in the unlocked position
c. There is enough clearance between the upper and lower fifth wheel
a. There is enough clearance between the tractor frame and the landing gear
