CDL AIR BRAKES PRACTICE TEST - VIRGINIA
21.
Dual tires:
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should always come in contact with each other.
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should come in contact with each other whenever possible.
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should not come in contact with each other.
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22.
The spring brakes come on:
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when air pressure in both air brake systems rises to a value set by the manufacturer.
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when main air pressure is lost.
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when you bring the vehicle to a complete stop right away.
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23.
Most heavy duty vehicles use ___ air brake systems for safety.
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dual
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triple
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single
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24.
At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________ to be sure it is safe to proceed.
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listen, look and stop
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go, stop and listen
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stop, look, and listen
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25.
A low air pressure warning signal:
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is optional on vehicles with air brakes.
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is required on all vehicles without air brakes.
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is required on vehicles with air brakes.
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