Iowa DMV CDL General Knowledge Quick Practice Test 1

Iowa DMV CDL General Knowledge Quick Practice Test 1 For 2022

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. If you must back up, it is helpful to:

Drive as fast as possible to complete the maneuver quickly.
First walk the line of travel to look for obstacles.
Use only the passenger side mirror.

2. What should happen if the air pressure in the braking system's air tanks falls below 60 psi?

The warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The steering wheel will lock up.

3. During the vehicle inspection test, you will be asked to:

Change a tire.
Explain to the examiner what you would inspect and why.
Estimate the weight of a load in a trailer.
Change a windshield wiper.

4. An emergency brake must be controlled by:

Mechanical force.
Air pressure.
Gravity.

5. When driving, being aware of what is happening behind you is:

Not important.
Important.
Distracting.

6. Intrastate carriers must have what information displayed on both sides of their vehicle?

The permit number
The model number of truck
The maximum weight allowed
The destination

7. When checking the springs during a vehicle inspection, do all of the following, except:

Look for missing leaf springs.
Look for broken coil springs.
Ensure torsion springs are not damaged.
Glue cracked leaf springs.

8. You will often have to drive your vehicle under bridges and overpasses. If approaching such an opening, you should:

Assume the posted clearance height is accurate.
Assume the posted clearance height is inaccurate.
Measure the height of the opening before proceeding.

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