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Kansas CDL Combination Test 1
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In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Air pressure drops to a level between 20 and 45 psi.
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure is above 45 psi.
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Correct Answer:
Air pressure drops to a level between 20 and 45 psi.
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