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UPGRADE TO CDL PREMIUM
1.
The air compressor is connected to:
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the radiator.
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the suspension system.
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the engine.
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the transmission.
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2.
Stepping on and off the brake pedal several times:
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reduces the air pressure in the tanks.
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may cause air leaks.
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may result in dangerously thin linings.
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All of the above.
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3.
Front-end header boards:
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protect drivers from cargo in case of an accident or emergency stop.
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should never be used.
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reduce traction.
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protect drivers from spilled cargo.
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4.
A low air pressure warning signal must come on when the air pressure in the tanks falls below:
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10 psi.
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60 psi.
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15 psi.
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100 psi.
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5.
The alcohol evaporator:
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shows how much air pressure you are applying to the brakes.
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eliminates the need for daily air tank drainage.
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ensures the coolant temperature gauge remains in the normal range.
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helps to reduce the risk of ice in air brake valves and other parts in cold weather.
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6.
You are driving on a steep downgrade. If your safe speed is 35 mph, you should apply the brakes when your speed reaches:
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25 mph
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30 mph
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45 mph
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35 mph
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7.
The safety relief valve is located:
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on the dashboard.
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in the first tank the air compressor pumps air to.
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on each end of the vehicle's axles.
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in the front brake.
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8.
You are coming down a long, steep downgrade. Which of the following is a sign that your brakes may have started to fade?
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You have to apply your brakes harder and harder to get the same stopping power.
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The brake pedal feels spongy or goes to the floor.
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You hear a loud "bang".
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The steering feels heavy.
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9.
In a vehicle with a dual air brake system:
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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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one system supplies air to the trailer.
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All of the above.
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10.
Before starting down a hill, you should slow down and shift down:
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so you can coast downhill.
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to a gear that will cause your engine to exceed its redline.
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to a speed that you can control without using the brakes hard.
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to a gear that will cause your brakes to overheat.
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