IL CDL AIR BRAKES PRACTICE TEST
16.
When the air pressure is built up to governor cutoff, the air leakage rate for combination vehicles with the engine off and the foot brake fully applied should be less than_____ in one minute.
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5 psi
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2 psi
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3 psi
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4 psi
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17.
Tar in the road pavement rising to the road surface in very hot weather:
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causes the road to become very slippery.
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is very sticky and will slow down your vehicle.
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does not affect the road surface or driving conditions.
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might get in your engine.
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18.
What should you do to test your vehicle's low air pressure warning signal?
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With the key in the "on" or "battery charge" position, rapidly apply and release the foot brake.
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Release the parking brake valve and the tractor protection valve and reduce the air pressure by stepping on and off the brake pedal.
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Pump the brakes until the air pressure drops below 80 psi.
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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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19.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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wet and dry.
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left and right.
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high and low.
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normal and slippery.
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20.
The air compressor stops pumping air into the air storage tanks when air tank pressure rises to around:
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100 psi.
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450 psi.
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125 psi.
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250 psi.
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