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UPGRADE TO CDL PREMIUM
1.
Before starting down a hill, you should slow down and shift down:
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to a gear that will cause your engine to exceed its redline.
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to a gear that will cause your brakes to overheat.
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to a speed that you can control without using the brakes hard.
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so you can coast downhill.
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2.
Which of the following can cause brakes to fade or fail?
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Not relying on the engine braking effect
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Excessive use of the service brakes
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Brakes out of adjustment
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All of the above.
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3.
Why must air tanks be drained?
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Your transmission fluid may drain out.
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There might not be enough antifreeze in the system.
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The alcohol evaporator might stop working.
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The water can freeze in cold weather and cause brake failure.
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4.
The safety valve is usually set to open at:
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125 psi
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150 psi
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100 psi
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200 psi
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5.
To apply the parking brakes:
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place the parking brake control knob in Neutral.
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pull the parking brake control knob out.
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push the brake pedal three times.
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push the parking brake control knob in.
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6.
What factors can cause brakes to fade or fail?
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Overheating, low air pressure or water in the air tanks.
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Going too slow.
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Not taking your foot off the accelerator.
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Not pressing the brake pedal hard enough.
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7.
Rough acceleration:
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improves gas mileage.
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can cause mechanical damage.
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is necessary to warm up the engine.
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is recommended during long trips.
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8.
In a vehicle with a dual air brake system:
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one system supplies air to the trailer.
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each system has its own air tanks.
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both systems typically operate the regular brakes on the rear axle.
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All of the above.
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9.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; less
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less; more
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greater; more
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greater; less
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10.
Which of the following is NOT a reason for hydraulic brake failure?
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Brake fade on long hills
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Loss of hydraulic pressure
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Stab braking
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All of the above.
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