Main menu
📖 Combination Test
Page 3/7
21
You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:
Empty.
At normal pressure. ✓ CORRECT
Between 60 and 80 psi.
22
You are coupling tractor to a semi-trailer. You have connected the airlines. Before backing under the trailer you should:
Supply air to the trailer system, then pull out the air supply knob. ✓ CORRECT
Pull ahead to test the glad hands connections.
Make sure that the trailer brakes are off.
23
You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under?
The emergency and service lines. ✓ CORRECT
The electrical service cable.
Nothing. Back up and lock the fifth wheel.
24
Tractor with ___ trailer requires the shortest amount of stopping distance.
Empty
Partly loaded
Fully loaded. ✓ CORRECT
25
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):
Make sure that the brakes are properly adjusted.
Keep both hands firmly on the steering wheel.
Go slow around turns. ✓ CORRECT
26
After you have coupled the trailer you should have to raise the landing gear by using:
Low gear. ✓ CORRECT
Intermediate.
High gear.
27
You supply air to the trailer tanks by:
Pushing in the trailer air supply valve. ✓ CORRECT
Pulling out the trailer air supply valve.
Connecting the service line glad hands.
28
There are two things that a driver can do to prevent a rollover. They are (1) go slow around turns and (2):
Make sure that the brakes are properly balanced.
Keep the cargo as close to the ground as possible. ✓ CORRECT
Keep the fifth wheel free play as small as possible.
29
Why should you be sure that the fifth wheel plate is greased as required?
Toe ensure a good electrical connection.
To prevent steering problems. ✓ CORRECT
To reduce e heat and noise.
30
Why should you be sure that the fifth wheel plate is greased as required?
Toe ensure a good electrical connection.
To prevent steering problems. ✓ CORRECT
To reduce e heat and noise.