AIR BRAKES PRACTICE TEST - KENTUCKY
11.
When you release the brake pedal, the _____ rotates back and a spring pulls the brake shoes away from the drum.
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air compressor belt
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S-cam
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hydraulic brake system
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pressure gauge
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12.
With the air pressure built up to governor cutoff, the maximum leakage rates per minute are ___ psi for single vehicles and ___ psi for a combination of 2 vehicles.
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3; 2
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3; 4
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4; 5
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5; 6
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13.
Brake fade results from, and is affected by:
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excessive heat caused by using the brakes too much.
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brakes out of adjustment.
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excessive heat caused by not relying on the engine braking effect.
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All of the above.
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14.
In vehicles with air brakes, the air compressor governor:
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controls how much air the air compressor will pump into the air storage tanks.
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controls when the air compressor will pump air into the air storage tanks.
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controls when the air storage tanks will pump air into the air compressor.
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None of the above.
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15.
When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
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if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
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You may not notice a major leak in the service line until you try to put the brakes on.
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The air could leak out of the trailer air tank, releasing its emergency brakes.
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None of the above.
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