IOWA CDL PRACTICE TEST - GENERAL KNOWLEDGE
41.
Antifreeze:
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helps the engine only under hot conditions.
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helps the engine only when the temperature is below freezing.
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helps the engine under hot conditions as well as cold conditions.
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42.
When crossing railroad tracks, you should:
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stop on the tracks.
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shift gears while crossing the tracks.
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stay in your lane.
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43.
You must have at least _____ inch tread depth in every major groove on front tires.
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2/32
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4/32
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6/32
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44.
If your brakes get wet, it can cause them:
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to apply unevenly.
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to be weak.
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All of the above.
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45.
If you are caught in strong winds, you should:
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keep a strong grip on the steering wheel and slow down or pull off the roadway.
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immediately take your foot off the accelerator.
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speed up while keeping a strong grip on the steering wheel.
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46.
You must use ________ as the principal way of controlling your speed on downgrades.
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controlled braking
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the brake pedal
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the braking effect of the engine
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47.
To prevent drowsiness before a trip, drivers should:
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avoid medications that cause drowsiness.
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avoid scheduling trips for the middle of the night.
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All of the above.
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48.
When driving, you should be alert for:
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drivers whose vision is blocked.
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people who are distracted.
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All of the above.
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49.
If the drive wheels begin to spin, you should:
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apply your brakes all the way.
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accelerate smoothly and change gears as necessary.
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take your foot off the accelerator.
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50.
Two of the most common causes of tire fires are:
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Duals that touch and under-inflated tires.
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Loose lug nuts and duals that touch.
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Driver smoking and bleeding tar.
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