Iowa DMV CDL Combination Quick Practice Test

Iowa DMV CDL Combination Quick Practice Test For 2024

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. When the wheels of a trailer lock up:

The trailer will stay straight.
The trailer tends to swing around.
The cab will swing, but the trailer will stay straight.
They will likely go flat.

2. When driving a combination rig, following distance should be:

Decreased in poor weather.
Shorter than when driving a single vehicle.
About the same as when driving a single vehicle.
Longer than when driving a single vehicle.

3. If your vehicle gets stuck on railroad tracks, you should:

Sit in the cab and call for help.
Exit the cab and walk away from the tracks.
Motion for another driver to push your vehicle.

4. The trailer hand valve should:

Be used for parking.
Be used only to test the trailer brakes.
Be used together with the brake pedal.
Be used on slippery surfaces.

5. Starting in which year were newly manufactured trailers required to have ABS?

1972
1987
1998
2004

6. When backing a trailer, you must turn the steering wheel:

In the direction you want the trailer to move.
In the direction opposite of where you want the trailer to move.
To the left until backing is complete.

7. Look for matching colors when coupling glad hands. Service lines are often:

Green.
Orange.
Red.
Blue.

8. In a combination rig, it is best to make:

Quick, sudden stops.
Sharp turns.
Quick accelerations.
Slow, planned stops.

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