NEW HAMPSHIRE CDL AIR BRAKES PRACTICE TEST
6.
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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150 psi
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35 psi
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50 psi
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100 psi
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7.
Rough acceleration:
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is recommended during long trips.
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improves gas mileage.
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is necessary to warm up the engine.
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can cause mechanical damage.
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8.
One way to prevent hydroplaning is to:
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make sure you have enough tread on your tires.
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have less than 4/32 inch tread depth in every major groove on front tires.
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take curves at higher speeds.
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use the controlled braking method.
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9.
At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________ to be sure it is safe to proceed.
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listen, look and stop
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go, stop and listen
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go, look and put the transmission in neutral
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stop, look, and listen
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10.
Why must air tanks be drained?
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The low boiling point of water reduces braking power.
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To keep from fouling the air compressor oil.
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Water and
oil reduce the air pressure.
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Water can freeze in cold weather and cause brake failure.
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