WA CDL AIR BRAKES PRACTICE TEST
11.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by feeling the brakes come on.
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by seeing it in your mirrors.
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12.
Why must air tanks be drained?
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The alcohol evaporator might stop working.
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The water can freeze in cold weather and cause brake failure.
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There might not be enough antifreeze in the system.
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13.
You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
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you'll have to immediately retake your test using another vehicle.
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you'll need to take another knowledge test about air brakes.
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you will be restricted to driving vehicles without air brakes.
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14.
In a dual-air system - with engine at operating RPM, the pressure should build from 85 to 100 psi within how many seconds?
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12
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20
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45
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15.
A tank endorsement is:
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only required when transporting gases.
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only required when transporting liquids.
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required for both liquids and gases.
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