TN CDL AIR BRAKES PRACTICE TEST
11.
Air brakes use ________ to make the brakes work.
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compressed oil
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compressed gas cylinders
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compressed air
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compressed gases
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12.
The parking or emergency brakes of trucks or buses must be held on by:
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fluid pressure.
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spring pressure.
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air pressure.
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hydraulic pressure.
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13.
At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:
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over 250 feet.
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less than 150 feet.
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less than 250 feet.
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over 450 feet.
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14.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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50 to 75 psi
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20 to 45 psi
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100 to 120 psi
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10 to 20 psi
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15.
If your ABS fails:
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you will still have normal brake functions.
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you will have no brake function, and could lose control.
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your tires might grab unexpectedly and you could lose control.
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the first step is to get the vehicle off the road and stop.
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