Air Brakes Practice Test - Kansas
16.
You supply air to the trailer brake system by:
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pushing in the trailer air supply knob.
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connecting the tractor service air line to the trailer service glad hand.
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pulling out the trailer air supply valve.
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plugging the electrical cord into the trailer.
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17.
Radial and bias-ply tires:
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should be used together.
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should be used together only during bad weather.
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should not be used together.
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should be used together only when driving in packed snow.
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18.
Air brakes:
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can improve fuel efficiency.
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are an effective way to stop large and heavy vehicles.
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should be used only when driving on wet roads.
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are prohibited on larger vehicles.
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19.
When the spring brakes are on, you should push the brake pedal down:
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Only when driving downhill.
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Never.
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Only when approaching railroad-highway crossings.
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Only when driving uphill.
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20.
Tractor and straight truck spring brakes will come fully on when the air pressure drops to a range of:
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5 to 15 psi.
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30 to 35 psi.
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20 to 45 psi.
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55 to 74 psi.
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