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

How can you check slack adjusters?

2 / 40

What will occur if you cross the connect the air lines?

3 / 40

As the driver of a bus, how can you best avoid hindering other traffic on the highway?

4 / 40

When inspecting the ______you are making sure that the lines and hoses are not chafed, cut, pinched, or dragged against tractor parts.

5 / 40

What is the best way to see the sides and rear of your vehicle?

6 / 40

The most stable tanker shape is:

7 / 40

When transporting hazardous loads, you must check the tires at least:

8 / 40

Select the true statement about speed and stopping distance.

9 / 40

To find out if a shipment includes a hazardous material, you should:

10 / 40

Surge affects the handling of a tanker by:

11 / 40

Select the statement that is true in regards to managing space to the sides.

12 / 40

These tires should have a minimum tread depth of 4/32 inches.

13 / 40

What are some things you should check on the front of your vehicle when doing the walk-around inspection?

14 / 40

The emergency air line is _____and the service air line is____.

15 / 40

The emergency air line is used to:

16 / 40

You must have placards for explosives, poison gas or flammables exceeding:

17 / 40

If you are drowsy, you should _____ before you drive.

18 / 40

When checking the wheelchair lift, the things you should look for are:

19 / 40

Where are the two main places where the hazardous material identification number appears?

20 / 40

Which of the following is a reason that shippers package material?

21 / 40

How should the pintle hook be when backing a dolly under the second trailer?

22 / 40

To avoid rollover when going through a curve, the best thing to do is:

23 / 40

In what position should the converter dolly air tank drain valves and pintle hook be in?

24 / 40

This item should not be rusted, bent, or damaged and centered over evenly spaced tires and dual wheels.

25 / 40

If you work for an interstate carrier:

26 / 40

Select the false statement about tractor protection valves.

27 / 40

Why is it dangerous to unlock the pintle hook with the dolly still under the rear trailer?

28 / 40

____is what can legally hold the parking brake or emergency brake in position for a bus, truck, or truck tractor.

29 / 40

You are inspecting the_____when looking for broken welds, cracks, holes, or other damage to the longitudinal frame member, cross members, box, and floor.

30 / 40

Do converter dollies have spring brakes?

31 / 40

This item should be firmly attached the to frame, be solid, and clear of objects:

32 / 40

What is always required before loading, driving, or unloading a tanker?

33 / 40

Spring brakes are usually held back by_____during normal driving.

34 / 40

This object is not checked at the rear of the trailer.

35 / 40

After deciding the type of evacuation that is necessary, the next step you must take is:

36 / 40

Should your air compressor stop working:

37 / 40

If there is no traffic light or attendant, how far from the draw of a drawbridge must you stop?

38 / 40

How do you supply air to the trailer tanks?

39 / 40

Should the air pressure in the service air tanks fall below____the driver must be alerted via warning mechanism in the truck cab.

40 / 40

What is most likely to occur when driving a set of doubles and a set of trailer wheels goes into a skid?

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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.