AR CDL AIR BRAKES PRACTICE TEST
21.
Rough acceleration:
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is necessary to warm up the engine.
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is recommended during long trips.
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can cause mechanical damage.
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improves gas mileage.
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22.
Front brake limiting valves were used to:
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prevent overheating of the front tires.
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reduce exhaust emissions.
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reduce the chance of the front wheels skidding on slippery surfaces.
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reduce your speed so further braking or shifting is not required.
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23.
The best way to recognize that your trailer has started to skid is:
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by feeling the brakes come on.
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by seeing it in your mirrors.
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by opening the window and feeling the front of the mirror.
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by recognizing tire failure.
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24.
Dual tires:
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should not come in contact with each other.
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should come in contact with each other whenever possible.
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are dangerous.
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should always come in contact with each other.
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25.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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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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release the parking brake, leave the engine running
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