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UPGRADE TO CDL PREMIUM
1.
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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2.
You should check air pressure and temperature gauges:
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at the end of each trip.
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as often as is practical.
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at the beginning of each trip.
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3.
How do you check that spring brakes come on automatically?
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Continue to step on and off the brake pedal until the air pressure falls to the manufacturer’s specification.
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On a tractor-trailer combination vehicle, continue to step on and off the brake pedal until the tractor protection valve and the parking brake valve close.
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All of the above.
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4.
The __________ keeps air from going out if the air compressor develops a leak.
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emergency relay valve
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one-way check valve
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tractor protection valve
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5.
Empty trucks have the best braking. True or False?
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True.
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False.
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It depends on the cargo.
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6.
If the low pressure warning signal doesn't work:
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this could cause sudden emergency braking in a single-circuit air system.
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you could lose air pressure and you would know it.
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None of the above.
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7.
Your vehicle has a dual air brake system. If one air system is very low on pressure, you should:
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call your dispatcher or supervisor for instructions.
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reduce your speed and check the low air pressure warning signal for the other system regularly.
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bring the vehicle to a safe stop, and have the air brakes system fixed.
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8.
Which of the following statements is true?
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Poor cargo ventilation is a common cause of fire.
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Carrying a properly charged and rated fire extinguisher will help prevent fires.
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There is no way that short circuits due to damaged insulation can cause a vehicle fire.
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9.
The safety relief valve is usually set to open at ____ psi.
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75
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50
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150
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10.
Air tank drains:
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are used to remove water and oil from the air tanks.
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should not be used in wet weather.
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protect the tanks and the rest of the system from too much pressure.
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