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UPGRADE TO CDL PREMIUM
1.
Most heavy-duty vehicles use:
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triple air brake systems.
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dual air brake systems.
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single air brake systems.
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2.
During a trip you should check:
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pressure gauges.
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temperature gauges.
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All of the above.
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3.
Emergency brakes are:
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not required on doubles.
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required on all vehicles.
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not required on buses.
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4.
In vehicles with air brakes, the two markings on a front brake limiting valve are:
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left and right.
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high and low.
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normal and slippery.
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5.
Which of the following is not a way to know when to change gears?
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Use road speed (mph)
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Check that the pressure gauge shows normal oil pressure
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Use engine speed (rpm)
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6.
To check that spring brakes come on automatically, the first thing to do is to:
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release the parking brake, move the vehicle forward slowly, and apply the brakes firmly.
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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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turn off the engine, release the parking brake and time the air pressure drop.
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7.
Brake lag is:
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the amount of air pressure required to stop the vehicle.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the time required for the air brakes to work after the brake pedal is pushed.
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8.
If are being followed closely, you should:
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change lanes quickly.
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decrease your following distance.
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increase your following distance.
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9.
Which of the following is NOT a reason for hydraulic brake failure?
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Stab braking
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Brake fade on long hills
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Loss of hydraulic pressure
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10.
To prevent drowsiness you should:
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get adequate sleep before a trip.
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never drive with a passenger.
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schedule trips for the middle of the night.
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