NM CDL AIR BRAKES PRACTICE TEST
6.
Passive railroad crossings:
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should never be crossed using a CMV.
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have at least one traffic control device.
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do not have traffic control devices.
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7.
The safety valve is usually set to open at:
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125 psi
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200 psi
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150 psi
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8.
How should you apply the brakes when going down a steep downgrade?
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Apply the brakes as hard as you can without locking the wheels.
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Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
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Apply the brakes when you reach the bottom of the downgrade.
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9.
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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10.
If the spring brakes do not release when you push the trailer air supply control, you should:
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rev or
lug the engine.
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check the electrical cables.
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check the air line connections.
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