AIR BRAKES CDL PRACTICE TEST - KENTUCKY
16.
When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:
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the road conditions.
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the total weight of the vehicle and cargo.
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the length of the grade.
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All of the above.
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17.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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30 to 35 psi.
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5 to 15 psi.
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20 to 45 psi.
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55 to 74 psi.
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18.
The tractor protection valve:
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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will close automatically if the air pressure drops to a certain level.
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All of the above.
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19.
Which of the following is NOT a warning sign of fatigue?
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Trouble remembering the last few miles driven
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Driving at the speed of the traffic
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Heavy eyelids
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Frequent blinking
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20.
On front tires, tread should be at least:
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4/16 inch
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1/16 inch
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2/32 inch
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4/32 inch
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