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UPGRADE TO CDL PREMIUM
1.
The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
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there is enough clearance between the rear of the tractor frame and the landing gear.
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there is enough clearance between the top of the tractor tires and the nose of the trailer.
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All of the above.
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None of the above.
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2.
With brake drums, if brakes become too hot:
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the brakes may stop working.
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the brakes will supply too much power to the drive wheels.
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your ABS will malfunction.
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the air compressor will kick on to cool the brakes.
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3.
If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
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piled up high with heavy cargo on top.
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centered and spread out as much as possible.
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to one side and as close to the ground as possible.
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loaded so there is a high center of gravity.
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4.
If your trailer starts to skid, you should:
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pump the brakes.
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steer in the opposite direction.
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release the brakes.
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lock the brakes.
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5.
If you begin to feel drowsy while driving, you should:
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pull off the road and get some rest.
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get some coffee.
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get an energy drink.
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open your window.
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6.
You supply air to the trailer brake system by:
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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pulling out the trailer air supply valve.
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7.
In a vehicle with a dual air brake system:
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one system supplies air to the trailer.
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both systems typically operate the regular brakes on the rear axle.
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each system has its own air tanks.
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All of the above.
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8.
After starting the engine, oil pressure should rise to a normal level:
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within seconds.
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within 6 minutes.
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within 2 minutes.
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within 3 miles.
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9.
In vehicles with air brajes, the tractor protection valve:
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keeps air in the tractor or truck brake system.
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provides the air pressure used to operate trailer brakes.
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is used to connect the service and emergency air lines from the truck/tractor to the trailer.
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carries air, which is controlled by the trailer hand brake or the foot brake.
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10.
ABS helps you:
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avoid wheel lock up and maintain control of your vehicle when you brake.
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steer gently and smoothly while you are braking.
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increase your normal braking capability.
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stop much faster.
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