AIR BRAKES CDL PRACTICE TEST - UTAH
21.
To test the air leakage rate, with a fully-charged air system you should ____________ and time the air pressure drop.
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release the parking brake, leave the engine running
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turn off the engine, release the parking brake
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check the air compressor's drive belt, chock the wheels
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put alcohol into the air system, run the engine at a fast idle
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22.
A low air pressure warning signal is required on:
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all vehicles with air brakes.
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Warning signals are optional.
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all vehicles with air brakes built after 2005.
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all vehicles with air brakes built after 2009.
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23.
What is the best way to test the low air pressure warning signal?
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Shut the engine off when you have enough air pressure, turn the electrical power on and step on and off the brake pedal to reduce air pressure to below 60 psi.
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step on and off the brake pedal while the engine is running.
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pump the brakes until the air pressure drops below 45 psi.
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All of the above.
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24.
The tractor protection valve:
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will close automatically if the air pressure drops to a certain level.
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provides the air supply for the brake system.
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will close if you apply the parking brakes.
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All of the above.
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25.
When meeting an oncoming vehicle at night, if the other driver does not put their low beams on, you should:
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slow down and look straight ahead in your lane.
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look slightly to the right to avoid looking directly at the lights of the oncoming vehicle.
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"get back at the other driver" by putting your own high beams on.
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flash your high beams at the other driver.
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