AL CDL AIR BRAKES PRACTICE TEST
16.
Passive railroad crossings:
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usually have a person directing traffic.
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do not have traffic control devices.
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should never be crossed using a CMV.
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have at least one traffic control device.
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17.
To test the service brake:
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gently try to pull forward with the trailer parking brake on, then release the brake.
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push the brake pedal firmly while going about 5 mph.
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push the brake pedal firmly while slowly moving backward.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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18.
Air pressure should build up in a single air system, within about:
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15 minutes.
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10 minutes.
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3 minutes.
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1 minute.
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19.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; less
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greater; more
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less; more
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greater; less
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20.
In vehicles with air brakes, the air compressor governor:
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controls when the air storage tanks will pump air into the air compressor.
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air compressor will pump air into the air storage tanks.
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None of the above.
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