1.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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100 to 120 psi
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10 to 20 psi
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20 to 45 psi
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2.
A trailer jackknife is more likely to happen when the trailer is:
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loaded to its full capacity.
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empty.
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overloaded.
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3.
Inspecting the fifth-wheel does NOT include:
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checking for missing or damaged parts.
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backing until the fifth-wheel just touches the trailer.
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checking that there are no cracks in the frame.
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4.
Transporting hanging meat requires special attention. Why?
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Because hanging meat can be an unstable load with a high center of gravity.
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Because you have to drive fast to get it delivered fresh.
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Because refrigerated trucks have less traction.
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5.
Overloading can have negative effects on:
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steering.
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braking.
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All of the above.
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6.
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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neither side (back up straight).
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7.
The use of brakes on a steep downgrade is:
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a supplement to the braking effect of the engine.
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the main braking factor.
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much more effective than the engine braking effect.
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8.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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prevent movement of cargo.
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keep from rolling back.
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hold compressed air.
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9.
If the safety relief valve in the air brake system releases air:
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the valve is fully operational.
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this will supply more power to the brakes.
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something is wrong.
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10.
When driving at night you should:
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use your high beams when it is safe and legal to do so.
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always use low beams.
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All of the above.
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