WV CDL AIR BRAKES PRACTICE TEST
21.
Why must air tanks be drained?
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Water can freeze in cold weather and cause brake failure.
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The low boiling point of water reduces braking power.
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Water and
oil reduce the air pressure.
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To keep from fouling the air compressor oil.
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22.
If your vehicle has dual parking control valves, you can use pressure from a separate tank to:
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release the spring brakes so you can move the vehicle in an emergency.
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park better.
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balance the service brakes while you are parked.
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None of the above.
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23.
When driving in hot weather, drivers should inspect tires:
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every 3 hours or every 75 miles.
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every hour or every 50 miles.
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every 2 hours or every 100 miles.
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every 4 hours or every 200 miles.
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24.
Parking brakes are:
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not required on trailers.
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required on all vehicles.
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not required on commercial vehicles with air brakes.
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not required on buses.
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25.
The heavier the vehicle:
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the less work the brakes must do to stop it.
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the more work the brakes must do to stop it.
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the higher the center of gravity will be.
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None of the above.
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