AIR BRAKES PRACTICE TEST - TEXAS
21.
If your vehicle has an alcohol evaporator, every day during cold weather, you should:
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fill it up with oil to prevent alcohol from freezing.
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check the alcohol container and fill up as necessary.
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ensure that compressed air usually has some water and some compressor oil in it.
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fill it up with oil to prevent the pipes from freezing.
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22.
When is it safe to leave your vehicle unattended without applying the parking brakes or chocking the wheels?
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When the tank pressure falls to the "cut-in" pressure.
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Only while you are taking a rest break.
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When you are conducting your pre-trip inspection.
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Never.
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23.
Tar in the road pavement rising to the road surface in very hot weather:
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causes the road to become very slippery.
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is very sticky and will slow down your vehicle.
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might get in your engine.
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does not affect the road surface or driving conditions.
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24.
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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All of the above.
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25.
It may not be safe to operate at legal maximum weights:
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on two-way streets.
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on highways.
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during bad weather or in mountains.
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in hot weather.
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