CDL PRACTICE TEST - GENERAL KNOWLEDGE (IOWA)
31.
When you check your tires, you should look for all of the following EXCEPT:
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Tires from different manufacturers
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Dual tires that come in contact with parts of the vehicle
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Tread separation
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32.
You should downshift:
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before starting up a hill.
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before exiting a curve.
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before starting down a hill or entering a curve.
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33.
If your trailer starts to skid, you should:
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pump the brakes.
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release the brakes.
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steer in the opposite direction.
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34.
What is the minimum tread depth for front tires?
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4/32 inch
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1/32 inch
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1/2 inch
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35.
Most heavy trucks with manual transmissions require ____ to change gears.
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single clutching
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double clutching
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triple clutching
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36.
Which of the following statements about slippery roads is true?
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The road will freeze before bridges will.
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Shady parts of the road provide better traction than open areas.
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None of the above.
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37.
Skids caused by acceleration can usually be stopped by:
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applying the brakes firmly.
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swerving to the right.
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taking your foot off the accelerator.
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38.
While driving, you should use your mirrors to:
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check where the rear of your vehicle is while you make turns.
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know where other vehicles are around you.
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All of the above.
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39.
To avoid blinding other drivers, you should dim within ____ of an oncoming vehicle.
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250 feet
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500 feet
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1000 feet
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40.
Which of the following is a common cause of truck fires?
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Short circuits due to loose connections.
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Under-inflated tires and duals that touch.
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All of the above.
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