Iowa DMV CDL General Knowledge Quick Practice Test 3 For 2025

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

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Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. As the driver of a truck carrying a load, you are responsible for all of the following, except:

2. If you’re feeling tired before a drive, you should:

3. Your CDL will be revoked if:

4. Air brakes use ____ to function.

5. When performing a pre-trip inspection and looking into the fifth wheel gap, you should:

6. If the low pressure warning light comes on while you are driving:

7. What kind of brakes do most newer heavy-duty trucks use?

8. When looking under your vehicle's hood during a pre-trip inspection, you should:





 
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