CDL AIR BRAKES PRACTICE TEST - TENNESSEE
21.
Spring brakes are usually held back by:
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air pressure.
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modulating control valves.
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the brake pedal.
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the antilock braking system.
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22.
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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put alcohol into the air system, run the engine at a fast idle
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check the air compressor's drive belt, chock the wheels
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23.
With air brake vehicles, you should use the parking brakes:
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as little as possible.
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only if your vehicle is equipped with ABS.
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only during the vehicle inspection test.
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whenever you leave the vehicle unattended.
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24.
A broken exhaust system:
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can let poisonous carbon monoxide to leak into the cab.
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poses no threat to the driver.
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can improve fuel efficiency.
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does not cause problems.
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25.
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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