CDL AIR BRAKES PRACTICE TEST - ALABAMA
21.
At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:
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less than 250 feet.
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over 250 feet.
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less than 150 feet.
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over 450 feet.
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22.
Why must air tanks be drained?
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Water and
oil reduce the air pressure.
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Water can freeze in cold weather and cause brake failure.
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The low boiling point of water reduces braking power.
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To keep from fouling the air compressor oil.
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23.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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checking the air brake system pressure gauge for signs of major air loss.
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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All of the above.
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24.
An alcohol evaporator:
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to hold compressed air.
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protects the air brake system from too much pressure.
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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used to reduce the chance of the front wheels skidding.
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25.
Controlled braking:
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involves locking the wheels and then releasing the brakes.
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involves pumping the brakes while keeping steering wheel movements very small.
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must be used when you need to turn sharply while braking.
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can be used to keep your vehicle in a straight line and allow you to turn if necessary.
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