NC CDL AIR BRAKES PRACTICE TEST
6.
Antifreeze:
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doesn't help the engine in any way.
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helps the engine only under hot conditions.
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helps the engine only when the temperature is below freezing.
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helps the engine under hot conditions as well as cold conditions.
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7.
Hydroplaning is more likely if:
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tire pressure is low.
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tire tread is worn.
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the road is wet.
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All of the above.
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8.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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release the parking brake, leave the engine running
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check the air compressor's drive belt, chock the wheels
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put alcohol into the air system, run the engine at a fast idle
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turn off the engine, release the parking brake
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9.
The best way to know what's going on behind and to the sides of your vehicle is to:
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ask your passenger(s).
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lean out of the window.
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use the rear view camera.
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check your mirrors regularly.
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10.
The most common foundation brakes found on vehicles with air brakes are the:
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wedge brakes.
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S-cam brakes.
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parking brakes.
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disc brakes.
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