CDL AIR BRAKES PRACTICE TEST - PENNSYLVANIA
21.
When backing, you should:
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use the mirrors on both sides.
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back quickly.
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only use mirror on the driver's side.
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back and turn toward the right side whenever possible.
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22.
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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You should travel at the posted speed limit.
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Reduce your speed to a crawl.
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None of the above.
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23.
Air tank drains:
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are used to remove water and oil from the air tanks.
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protect the tanks and the rest of the system from too much pressure.
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are used to move air to the brakes.
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should not be used in wet weather.
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24.
Slack adjusters:
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are the linkage between the operating rod in the brake chamber and drum brakes or disk brakes in an air brake system.
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are used to adjust the brakes on an air-brake system.
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regulate the distance that the air brake has to travel to apply friction to the wheel.
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All of the above.
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25.
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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50 to 75 psi
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10 to 20 psi
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20 to 45 psi
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100 to 120 psi
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