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UPGRADE TO CDL PREMIUM
1.
An alcohol evaporator:
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protects the air brake system from too much pressure.
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used to reduce the chance of the front wheels skidding.
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to hold compressed air.
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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2.
The maximum leakage rates per minute after the initial pressure drop are:
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5 psi for single vehicles and 6 psi for a combination of 2 vehicles.
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1 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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4 psi for single vehicles and 2 psi for a combination of 2 vehicles.
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3 psi for single vehicles and 4 psi for a combination of 2 vehicles.
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3.
When going down grades, you should:
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rely solely on engine braking to reduce your speed.
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put the transmission in Neutral.
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downshift to a lower gear.
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shift up.
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4.
The most common foundation brakes found on vehicles with air brakes are the:
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wedge brakes.
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S-cam brakes.
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parking brakes.
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disc brakes.
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5.
On
a tractor-trailer equipped with a trailer brake hand
valve, the hand valve can be used to:
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hold compressed air.
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keep from rolling back.
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reduce the chance of the front wheels skidding.
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prevent movement of cargo.
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6.
The safety valve is usually set to open at:
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100 psi.
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75 psi.
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150 psi.
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200 psi.
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7.
Axle weight is:
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the value specified by the manufacturer as the loaded weight of one axle.
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the weight transmitted to the ground by one axle or one set of axles.
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the maximum safe weight your tires can carry at a specified pressure.
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the weight of all the axles added together.
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8.
ABS:
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improves your visibility at night.
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helps you avoid skids caused by over braking.
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helps you stop faster.
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may cause your wheels to lock when you break hard.
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9.
The air compressor governor:
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controls when the air storage tanks will pump air into the air compressor.
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stops the compressor from pumping air.
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allows the compressor to start pumping air when the tank pressure rises to the "cut-out" pressure.
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All of the above.
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10.
You must take the CDL skills tests in the type of vehicle for which you wish to be licensed. If your test vehicle does not have air brakes:
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you will be restricted to driving vehicles without air brakes.
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you'll need to take another knowledge test about air brakes.
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you won't receive a CDL.
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you'll have to immediately retake your test using another vehicle.
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