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UPGRADE TO CDL PREMIUM
1.
Which of the following is not part of the air brake system?
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Air compressor
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Air storage tanks
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Air filter
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Alcohol evaporator
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2.
Passive railroad crossings:
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have at least one traffic control device.
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should never be crossed using a CMV.
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do not have traffic control devices.
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usually have a person directing traffic.
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3.
Why must air tanks be drained?
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There might not be enough antifreeze in the system.
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Your transmission fluid may drain out.
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The water can freeze in cold weather and cause brake failure.
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The alcohol evaporator might stop working.
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4.
If you are being tailgated, you should:
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flash your brake lights.
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increase your following distance.
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speed up.
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move to the left lane.
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5.
The alcohol evaporator:
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eliminates the need for daily air tank drainage.
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shows how much air pressure you are applying to the brakes.
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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.
Under a pressurized system, the radiator cap:
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should always be cool.
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should never be removed until the system has cooled.
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should never be hot.
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should be removed when the coolant is hot.
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7.
The space under a heavily loaded vehicle can be very small. This can cause problems:
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on unpaved yards.
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when crossing railroad tracks.
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on dirt roads.
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All of the above.
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8.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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50 psi
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150 psi
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35 psi
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100 psi
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9.
The wig wag is:
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a low air pressure warning system.
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a noise reduction mechanism.
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when your tires might grab unexpectedly and you lose control of your vehicle.
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a type of rollover.
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10.
Spring brakes:
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will come fully on when air pressure drops to a certain range, typically 20 to 30 psi.
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will apply the brakes when a leak in the air brake system causes all the air to be lost.
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are usually held back by air pressure.
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All of the above.
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