IOWA CDL PRACTICE TEST - GENERAL KNOWLEDGE
21.
When a vehicle goes around a corner, the rear wheels:
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will turn freely.
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follow a different path than the front wheels.
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follow the same path as the front wheels.
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22.
When should you use the 4-way emergency flashers instead of flashing the brake lights to warn the drivers behind you?
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When you are driving very slowly or are stopped.
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At night time.
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When visibility is poor.
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23.
Which of the following is NOT a warning sign of fatigue?
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Missing exits
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Rubbing eyes
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Adjust your speed depending on driving conditions
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24.
Most heavy-duty vehicles use:
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air brakes.
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solid brakes.
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hydraulic brakes.
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25.
If you are carrying a heavy load that is slowing you down, you should:
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drive on the shoulder.
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drive in the left lane.
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drive in the right lane.
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26.
While crossing railroad tracks, you should:
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shift down.
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shift up.
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not shift gears.
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27.
If a load is 50 feet long, the minimum number of tie-downs required is:
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10
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4
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5
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28.
To avoid becoming distracted while driving, you should:
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plan your route before you begin driving.
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adjust all vehicle controls and mirrors prior to driving.
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All of the above.
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29.
Placards must be placed:
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on the rear only.
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on the front, rear and both sides of the vehicle.
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on the front only.
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30.
When backing a trailer, you should:
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try to position your vehicle so you can back on a curved path.
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turn the steering wheel in the opposite direction of the turn.
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turn the steering wheel toward the direction you want to go.
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