SOUTH DAKOTA CDL AIR BRAKES PRACTICE TEST
16.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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worn tire tread.
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rearward amplification.
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strong wind.
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the rear trailer of a triple.
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17.
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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With the engine running, put the vehicle in a forward gear and attempt to drive forward.
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Pump the brakes until the air pressure drops below 80 psi.
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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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18.
When the spring brakes are on, you should push the brake pedal down:
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Never.
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Only when driving uphill.
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Only when driving downhill.
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Only when approaching railroad-highway crossings.
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19.
When confronted by an aggressive driver, you should:
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make every attempt to get out of their way.
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avoid eye contact.
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call the police, if you have a cell phone and can do it safely.
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All of the above.
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20.
When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.
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right; right
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right; left
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left; left
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left; right
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