IA CDL AIR BRAKES PRACTICE TEST
16.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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turn off the engine, release the parking brake
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put alcohol into the air system, run the engine at a fast idle
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release the parking brake, leave the engine running
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17.
If you must stop on a one-way or divided highway, place your warning devices:
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100 feet, 200 feet, and 300 feet toward the approaching traffic.
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10 feet, 50 feet, and 150 feet toward the approaching traffic.
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10 feet, 100 feet, and 200 feet toward the approaching traffic.
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18.
By pushing the trailer air supply control knob in, you:
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supply the trailer with air.
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shut the air off and put on the trailer emergency brakes.
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supply the tires with air.
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19.
Emergency brakes are:
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required on all vehicles.
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not required on doubles.
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not required on buses.
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20.
Rough acceleration:
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improves gas mileage.
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can cause mechanical damage.
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is necessary to warm up the engine.
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