COLORADO CDL AIR BRAKES PRACTICE TEST
21.
One way to prevent hydroplaning is to:
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have less than 4/32 inch tread depth in every major groove on front tires.
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take curves at higher speeds.
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use the controlled braking method.
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make sure you have enough tread on your tires.
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22.
A passive railroad crossing is one that:
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has a traffic control device installed at the crossing to regulate traffic.
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has at least two traffic control devices installed at the crossing to regulate traffic.
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does not have any type of traffic control device.
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requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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23.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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20 to 45 psi.
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30 to 35 psi.
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5 to 15 psi.
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55 to 74 psi.
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24.
Before starting down a hill, you should slow down and shift down:
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to a gear that will cause your brakes to overheat.
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to a speed that you can control without using the brakes hard.
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so you can coast downhill.
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to a gear that will cause your engine to exceed its redline.
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25.
When using a fire extinguisher, you should stay:
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at whatever distance you think is safe.
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as far away from the fire as possible.
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at least 10 feet away from the fire.
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as close to the fire as possible, without getting burnt.
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