CDL AIR BRAKES PRACTICE TEST - NEBRASKA
11.
The air compressor governor:
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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controls when the air storage tanks will pump air into the air compressor.
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stops the compressor from pumping air.
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All of the above.
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12.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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You may not notice a major leak in the service line until you try to put the brakes on.
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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13.
The safety valve installed in the first tank the air compressor pumps air is set to open:
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if there is too much pressure.
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every 15 minutes.
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at 30 psi.
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if there is too little pressure.
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14.
The safety relief valve is located:
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in the first tank the air compressor pumps air to.
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in the front brake.
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on the dashboard.
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on each end of the vehicle's axles.
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15.
Air brakes use ________ to make the brakes work.
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compressed gas cylinders
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compressed air
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compressed gases
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compressed oil
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