IA CDL AIR BRAKES PRACTICE TEST
21.
A dual air brake system:
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has two separate air brake systems, which use a single set of brake controls.
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has a single air brake system, which uses a single set of brake controls.
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has two separate air brake systems, which use two separate sets of brake controls.
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22.
When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
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right; left
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left; right
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left; left
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23.
Most heavy-duty vehicles use:
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dual air brake systems.
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single air brake systems.
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triple air brake systems.
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24.
If your vehicle is hydroplaning, you should:
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release the accelerator and push in the clutch.
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accelerate to get through the water as quickly as possible.
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use the brakes to slow down.
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25.
The s-cam:
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helps ensure that air flows to all trailers.
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pulls the brake shoes away from the drum.
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forces the brake shoes away from one another and presses them against the inside of the brake drum.
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