iowa
CDL Practice Test

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Below are practice questions for the Iowa CDL test. The site is free and you are able to take the practice test as many times as you need to as you prepare to obtain your Iowa CDL. The questions and answers covered in these Iowa practice CDL tests are taken from the Iowa DOT CDL manual. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the "Start Test
" button below to begin.

1 / 40

The _____of the kingpin has the locking jaw close around it.

2 / 40

Select the false statement about suspension:

3 / 40

What is the reason that placards are used?

4 / 40

You must be alert for road hazards so that:

5 / 40

Another term for a smooth bore tank is:

6 / 40

When checking for_____you are looking for dripping fluids or puddles on the ground below the transmission or engine.

7 / 40

You should activate hazard lights within approximately how many feet before railroad crossing?

8 / 40

Select the portion of the combination vehicle that is most likely to turn over suddenly when pulling a double trailer:

9 / 40

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

10 / 40

Select the true statement in regards to stopping distance and speed:

11 / 40

Play of the steering wheel should not exceed:

12 / 40

Select how you would check the truck's slack adjusters.

13 / 40

Which of the following should you NOT do if you experience a tire failure?

14 / 40

What might happen if a trailer is too high when you try to couple?

15 / 40

Which of the following statements about special danger of loading and unloading is true?

16 / 40

How should the hand valve be used?

17 / 40

Select the true statement in regards to your brake function when your ABS fails

18 / 40

What is the correct number of red reflective triangles that you should carry?

19 / 40

You should decrease to a safe speed before entering a curve and then_____through it.

20 / 40

Of the following hazardous material classes, which is the most dangerous?

21 / 40

What does the drain valve for air tanks remove?

22 / 40

Wet brakes can cause _____.

23 / 40

Which of the following about the front tires on a commercial bus is true?

24 / 40

It has just reached freezing. Which of the following areas is slippery?

25 / 40

If you must stop on the shoulder of the road, you should place warning devices at all of the following places except...

26 / 40

The system that needs to be checked for signs of leaks with rust or carbon soot and damage is the _____.

27 / 40

The trailer height is correct for connecting a converter dolly to a second or third trailer when:

28 / 40

A tractor should not be backed under a trailer until the whole air system is:

29 / 40

Which seats not securely fastened to the bus are usually allowed?

30 / 40

At what "cut out" level does the governor stop pumping air?

31 / 40

Do empty trucks have the best braking?

32 / 40

When stopping for railroad tracks, you must stop no closer than how many feet before the nearest track?

33 / 40

Select the true statement in regards to the center of gravity for tanks:

34 / 40

Tires should should be replaced:

35 / 40

Select the statement that is not part of the air-brake system:

36 / 40

Select the reason as to why you should not use the trailer hand valve while driving.

37 / 40

If the hazardous materials are classified as FORBIDDEN you should:

38 / 40

How often should you check your cargo?

39 / 40

You must not allow riders to stand:

40 / 40

A "transport index" relates to products that are:

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CDL Category Practice Tests

CDL Practice Test

How To Get An iowa Commercial Drivers License

Individuals may apply for their CDL starting at age 18. To be eligible for interstate driving as well as HazMat and Doubles/Triples applicants must be 21 years of age or older. All individuals applying for an Iown CDL must present a Medical Examiner’s Certificate according to the United States Federal Regulations.

If any one of the descriptions below is true about an applicant, they will be disqualified from receiving their CDL.

  • Driver posses more than one driver’s license.
  • Driver was convicted of driving under the influence in the past 24 months.
  • Driver has a suspended, denied, canceled, or revoked driver’s license.

Endorsements
H – Hazardous Materials
N – Tank Vehicle
T – Doubles/Triples
X – Hazmat and Tank Comb
P – Passenger Vehicle
S – School Bus

Drivers must take a knowledge test as well as a practical skills test to showcase their knowledge of commercial driving laws and their ability to operate a commercial vehicle.

Hit the Open Road

iowa CDL License Test Tips

Applicants must complete a general knowledge test to display their understanding of commercial driving laws. The general knowledge exam is comprised of 50 questions. Those seeking a Class A CDL will need to complete an additional 20 question test on combination vehicles. Applicants seeking additional endorsements will need to take an additional test on the endorsement topic. The Passenger, Tank, and Doubles/Triples Endorsements are 20 question tests. Removing the Air Brake Restriction, the Iowa Operator and School Bus Endorsements are 25 questions. The Hazmat Endorsement is a 30 question test. All applicants must pass the respective assessments with a score of 80 percent or better to receive their Iowa CDL permit.

A skills assessment is required of all applicants. This assessment is comprised of three parts, which are the pre-trip inspection, basic controls skills, and on-road driving. Individuals applying for their P and S endorsements will be required to take the skills test in the respective vehicle for their endorsement.

Additional Information

Information on the Iowa Department of Transportation

The Iowa Department of Transportation administers CDL requirements and testing in Iowa. To get more information contact them via:

Website: https://iowadot.gov/DriversVehicles#CommercialDrivers

Phone:  515.239.1101

 

Additional Iowa CDL Helpful Links

Please use the links below to access more valuable Iowa CDL testing resources and to learn more about practice driving tests for the state of Iowa.