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1.
When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
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the trailer is fully loaded.
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the trailer is overloaded.
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the trailer is empty or lightly loaded.
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None of the above.
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2.
Headache racks:
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protect you from being hit by your cargo.
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can blind other drivers.
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help you keep weights within legal limits.
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None of the above.
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3.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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worn tire tread.
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the rear trailer of a triple.
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rearward amplification.
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strong wind.
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4.
If your trailer starts to skid, you should:
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release the brakes.
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steer in the opposite direction.
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lock the brakes.
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pump the brakes.
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5.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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6.
"Bobtail" tractors are:
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tractors with a tank.
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heavily loaded trailers.
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tractors with two trailers.
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tractors without semitrailers.
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7.
Weight that is loaded so there is a high center of gravity:
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reduces the chance that the load will shift to the side or fall off.
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makes a vehicle easier to handle.
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causes greater chance of rollover.
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All of the above.
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8.
Older trailers do not have spring brakes. If the air supply leaks away:
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there will be no emergency brakes.
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the ABS won't work properly.
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the trailer will stop normally.
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All of the above.
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9.
The trailer hand valve should be used only:
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to test the trailer brakes.
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in driving to prevent skids.
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only in combination with the foot brake.
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when the trailer is fully loaded.
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10.
After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
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25 miles
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50 miles
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20 miles
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two hours
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