AIR BRAKES PRACTICE TEST - OKLAHOMA
21.
Typically an air system is fully-charged at:
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25 psi
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75 psi
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125 psi
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22.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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air escaping from the open valve.
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a mechanical vibration.
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the service line valve close.
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23.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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greater; less
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greater; more
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less; more
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24.
Which of the following is not a way to know when to change gears?
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Use road speed (mph)
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Check that the pressure gauge shows normal oil pressure
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Use engine speed (rpm)
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25.
Which of the following is NOT correct? An ABS system:
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helps you stop faster.
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helps you avoid wheel lock up.
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is a safety anti-skid braking system.
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