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Combination Vehicles Practice Test
If the brakes are not released when you pushed the trailer air supply valve you should:
Check electrical cable.
Cross the airlines
Check airline connection
Air brake equipped trailers made before 1975:
Usually need a glad hand converter.
Often do not have spring brakes.
Cannot be legally operated on interstate highways.
Tractor with ______ trailer requires the shortest amount of stopping distance.
Fully loaded
Empty
Partly loaded
There are two things that a driver can do to prevent a rollover. They are: (1) go slow around turns; and (2):
Keep both hands firmly on the steering wheel.
Make sure that the brakes are properly balanced.
Keep the cargo as close to the ground as possible.
If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
The emergency trailer brakes will come on.
The trailer's tank will exhaust through the open line.
Nothing is likely to happen until you try to apply the brakes.
Where should the tractor be when you inspect landing gear after uncoupling the trailer?
With the fifth wheel directly beneath the kingpin.
Completely cleared from the trailer.
With the tractor frame under the trailer.
Why should you be sure that the fifth wheel plate is greased as required?
To ensure a good electrical connection.
To reduce heat and noise.
To prevent steering problems.
After connecting the airlines but before backing under the trailer you should:
Walk around the rig to be sure that it is clear.
Make sure that the trailer brakes are off.
Supply air to the trailer system, then pull out the air supply knob.
You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:
Between 60 and 80 psi.
At normal pressure
Empty.
The safest way to make a turn without entering another traffic lane is:
You should not make a turn and move to another place where you can make a turn without crossing other lane.
You should turn wide before you start the turn.
You should turn wide as you complete the turn.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
Air compressor to unload instead of pumping air.
Emergency trailer brakes to come on.
Trailer supply valve to open.
Glad hands are usually connecting which of these?
Electric lines from the tractor to trailer.
Kingpin from the trailer to the locking jaws of the fifth wheel.
Service and emergency air lines from the vehicle to the trailer.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
Air compressor to unload instead of pumping air.
Emergency trailer brakes to come on.
Tractor's air to dump into the trailer tank through the service line.
There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible; and (2):
Go slow around turns.
Keep both hands firmly on the steering wheel.
Make sure that the brakes are properly adjusted.
There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargos as close to the ground as possible; and (2):
Make sure that the brakes are properly adjusted.
Keep both hands firmly on the steering wheel.
Go slow around turns.
There are two things that a driver can do to prevent a rollover. They are: (1) go slow around turns; and (2):
Keep the cargo as close to the ground as possible.
Make sure that the brakes are properly balanced.
Keep the fifth wheel free play as small as possible.
The hand valve should be used:
To test the trailer brakes.
Only with a foot brake.
As a parking brake.
When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer.
Front
Back
Middle section
You are coupling tractor to a semitrailer. You have connected the airlines. Before backing under the trailer, you should:
Pull ahead to test the glad hands connections.
Make sure that the trailer brakes are off.
Supply air to the trailer system, then pull out the air supply knob.
If the service line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away?
Nothing is likely to happen until you try to apply the brakes.
The emergency trailer brakes will come on.
The trailer's tank will exhaust through the open line.
Which part of the kingpin should the locking jaws close around?
The head.
The shank.
The base.
You supply air to the trailer tanks by:
Connecting the service line glad hands.
Pulling out the trailer air supply valve.
Pushing in the trailer air supply valve.
While driving behind other vehicle under good condition you should allow at least one second between your vehicle and the vehicle ahead for each _____ (how many) feet of your vehicle length?
30
10
20
How much space should be allowed between upper and lower fifth wheel after coupling?
1/4 inch
Nothing
Just enough to sit on.
A driver crosses the air lines when hooking up to an old trailer. What will happen?
If the trailer has no spring brakes, you could drive away but you wouldn't have trailer brakes.
The brake lights will come on when the brake pedal is pressed.
The hand valve will apply the tractor brakes instead of the trailer brakes.
You are coupling a tractor to a semitrailer and have backed up but are not under it. What should you hook up before backing under?
The electrical service cable.
The emergency and service air lines.
Nothing. Back up and lock the fifth wheel.
You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
Kingpin is about 1 1/4 inches about the fifth wheel.
End of the kingpin is even with the top of the fifth wheel.
Trailer will be lifted slightly when the tractor backs under it.
The air brake leakage rate for a combination vehicle (engine off, brakes off) should be less than _____ psi per minute.
1/2
3
2
The higher the center of gravity of your truck, the:
Easier to turn around the corner
Easier to turn over
More stable while turning
After you coupled the trailer you should have to raise the landing gear by using:
High gear
Low gear
Intermediate
Time is Up!
