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1.
When the ______ closes, it stops any air from going out of the tractor.
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alcohol evaporator
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hand valve
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height control valve
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tractor protection valve
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2.
Which of the following is NOT part of inspecting the coupling?
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Checking that the locking lever is in the "lock" position
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
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Making sure there is no space between the upper and the lower fifth-wheel
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3.
When backing a trailer on a curved path you should back towards:
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either side.
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the driver's side.
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the passenger's side.
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neither side (back up straight).
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4.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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None of the above.
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5.
Cargo tie-downs are used to:
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keep cargo from shifting or falling.
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prevent skidding.
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prevent right-turn accidents.
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prevent freezing.
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6.
Which of the following is NOT part of testing the trailer service brakes?
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Checking for normal air pressure.
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Pushing in the trailer air supply knob.
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Releasing the parking brakes.
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Moving the vehicle forward slowly.
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7.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
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To prevent water and dirt from getting into the coupler and the air lines.
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To prevent freezing of the washer liquid.
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Because if you don't, you will never build system pressure.
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To prevent overheating.
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8.
Before entering a curve, you should:
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maintain your speed.
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come to a complete stop.
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increase your speed.
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reduce your speed.
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9.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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keep the vents clear so they work correctly.
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keep an eye on your tires.
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go slowly around turns.
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make sure that the release arm is in the engaged position.
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10.
If you let air out of hot tires:
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air pressure will increases, causing the tires to blow out.
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as the tire cools, the air pressure will be too low.
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the tires will cool off much sooner.
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None of the above.
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