RHODE ISLAND CDL AIR BRAKES PRACTICE TEST
21.
The Johnson bar is a valve that:
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works the trailer brakes.
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reduces the braking pressure to a safe level.
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is installed in the first tank the air compressor pumps air to.
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22.
The posted speed limit:
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may only be exceeded when driving in rural areas.
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should only be exceeded when passing other vehicles.
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should never be exceeded.
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23.
Emergency brakes and parking brakes must be held on by:
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mechanical force.
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air pressure.
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hydraulic pressure.
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24.
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 will be restricted to driving vehicles without 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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25.
If you're feeling tired while driving you should:
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stop driving and get some rest.
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eat something.
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drink coffee.
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