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📖 Combination Test
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61
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
Lifting the brake pedal.
Watching your mirrors to see if the trailer lights come on.
Applying and releasing the trailer brakes and listening for the sound of the brake. ✓ CORRECT
62
Before you back under a trailer, make sure that:
The trailer brakes are locked. ✓ CORRECT
The tractor protection valve is normal.
The air supply knob is in.
63
How should you test the tractor semitrailer connection for security?
Look at it carefully.
Rock the trailer back and forth with the trailer brakes locked.
Pull gently forward in low gear against the locked trailer brakes then look at it carefully. ✓ CORRECT
64
The front trailer supports are up and the trailer is resting on the tractor. Make sure:
There is enough clearance between the top of the tractor tires and nose of the trailer.
There is enough clearance between the tractor frame and the landing gear.
Both a and b are correct. ✓ CORRECT
65
To unlock the fifth wheel the locking lever should be placed in the ____ position.
Neutral.
Closed
Open. ✓ CORRECT
66
The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the _____ brake line.
Service
Parking
Emergency ✓ CORRECT
67
When coupling, the proper position of the fifth wheel is:
Level of the ground.
Tilted down toward the end of the trailer. ✓ CORRECT
Tilted up toward the end the trailer
68
What gear should the tractor engine be in after you uncouple the trailer and are inspecting the trailer supports?
Neutral. ✓ CORRECT
Low reverse.
High reverse.
69
When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:
Back you gently to ease pressure on the fifth wheel. ✓ CORRECT
Put on your tractor parking brakes.
Lower trailer landing gear.
70
When uncoupling the trailer, after you shut off the trailer air supply and lock the trailer brakes, you should:
Back you gently to ease pressure on the fifth wheel. ✓ CORRECT
Put on your tractor parking brakes.
Lower trailer landing gear.