DC CDL PRACTICE TEST - GENERAL KNOWLEDGE
31.
An alcohol evaporator:
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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to hold compressed air.
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used to reduce the chance of the front wheels skidding.
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protects the air brake system from too much pressure.
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32.
If you triple the speed from 20 to 60 mph the impact and braking distance is:
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12 times greater.
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9 times greater.
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6 times greater.
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3 times greater.
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33.
When backing, you should:
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back quickly.
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avoid using the mirrors.
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use a helper if possible.
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back and turn toward the right side.
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34.
On dry pavement, the braking distance when traveling at 55 mph is about:
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419 feet.
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216 feet.
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142 feet.
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61 feet.
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35.
_________ can make vehicle handling unsafe.
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Poor weight balance
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Poor ventilation
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ABS
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Dry roads
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36.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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Rain
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Repaving of the road
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The weight of a cargo
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Traffic
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37.
When driving on packed snow, you should reduce speed by:
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one-third.
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25%.
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10%.
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a half.
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38.
To avoid becoming an aggressive driver you should:
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make gestures to other drivers.
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give other drivers your full attention.
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give other drivers the benefit of the doubt.
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speed up if you think you’re going to be late.
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39.
Driving in very hot weather:
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should never be done.
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can make it difficult to stay in your lane.
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can increase tire pressure.
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can decrease oil pressure.
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40.
Drivers should watch out for black ice when the temperature is ______ freezing and the road looks ______.
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below; dry
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below; wet
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above; wet
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above; dry
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