CDL AIR BRAKES PRACTICE TEST - SOUTH CAROLINA
11.
The ______ puts alcohol into the air system.
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alcohol evaporator
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air tank drains
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alcohol storage tank
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alcohol tank drains
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12.
How can you tell if your vehicle is equipped with ABS (anti-lock braking system)?
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There is no way to tell, ABS is still optional on all vehicle types.
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ABS is required on all vehicles manufactured on or after 2005.
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ABS is required on all vehicles manufactured on or after 2000.
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Trucks, buses, trailers, and converter dollies built after 1998 are required to have ABS.
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13.
What is the best way to test the low air pressure warning signal?
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pump the brakes until the air pressure drops below 45 psi.
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step on and off the brake pedal while the engine is running.
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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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All of the above.
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14.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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the service line valve close.
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a thumping sound.
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air escaping from the open valve.
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a mechanical vibration.
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15.
If you get stuck on railroad tracks, you should:
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check the engine compartment quickly.
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get out of the vehicle and away from the tracks.
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have a helper push your vehicle.
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stay in the vehicle and call for help.
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