AIR BRAKES PRACTICE TEST - RHODE ISLAND
21.
If your trailer starts to skid, you should:
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use the trailer hand brake (if you have one) to straighten out the rig.
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release the brakes to get traction back.
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keep the rear of your vehicle close to the curb.
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22.
Parking brakes are:
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not required on commercial vehicles with air brakes.
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required on all vehicles.
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not required on trailers.
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23.
When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:
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the road conditions.
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the total weight of the vehicle and cargo.
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All of the above.
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24.
To operate a vehicle equipped with air brakes, you must pass the air brakes knowledge test. Why?
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If you don't pass the air brakes test, you can't get a CDL.
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All trucks have air brakes.
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If you don't pass the air brakes test, you will be restricted to driving vehicles without air brakes.
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25.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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450 psi.
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100 psi.
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125 psi.
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