AIR BRAKES PRACTICE TEST - DELAWARE
11.
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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20 to 45 psi
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50 to 75 psi
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100 to 120 psi
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10 to 20 psi
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12.
If your trucks has a high center of gravity, which of the following is true for curves?
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You should slow down, as your truck can roll over at the posted speed limit for the curve.
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Reduce your speed to a crawl.
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You should travel at the posted speed limit.
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None of the above.
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13.
Your truck has a dual air system. If either system is very low on pressure:
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the ABS will not work properly.
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either the front or the rear brake will not be fully operational.
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the tractor protection valve will not work properly.
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the low pressure warning signal will stop working.
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14.
If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.
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5 seconds
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2 seconds
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4 seconds
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3 seconds
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15.
The space under a heavily loaded vehicle can be very small. This can cause problems:
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when crossing railroad tracks.
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on dirt roads.
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on unpaved yards.
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All of the above.
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