AIR BRAKES PRACTICE TEST - NEW HAMPSHIRE
16.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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hold compressed air.
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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keep from rolling back.
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17.
Vehicles with ABS have ______ ABS malfunction lamps on the instrument panel.
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green
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blue
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orange
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yellow
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18.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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shutting the engine off so you can hear the brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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19.
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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20.
Controlled braking:
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can be used to keep your vehicle in a straight line and allow you to turn if necessary.
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involves locking the wheels and then releasing the brakes.
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involves pumping the brakes while keeping steering wheel movements very small.
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must be used when you need to turn sharply while braking.
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