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 purpose for the emergency air line is:

2 / 40

The Emergency Response Guide, ERG, can best be explained as _____.

3 / 40

You should check____when loading the small tanks of a cargo tank with bulkheads.

4 / 40

What is a passive railway crossing?

5 / 40

The interlock system for the brake and accelerator on a transit coach may be used:

6 / 40

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

7 / 40

When should you check your mirrors for a lane change?

8 / 40

Select the true statement about emergency brakes:

9 / 40

Select what you should not do when coupling the glad hands.

10 / 40

While completing the 2nd component of the air brake check you are required to turn the electrical power on, begin fanning off the air pressure by rapidly relasing and apply the foot brake and _____.

11 / 40

If your engine runs a pump used during delivery of compressed gas, should you turn off the engine before or after unhooking hoses after delivery?

12 / 40

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

13 / 40

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

14 / 40

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

15 / 40

How do you hook a combination to a second trailer without spring brakes and without using wheel chocks?

16 / 40

What is the normal operating range for a truck's oil pressure?

17 / 40

What should you hook up before backing a tractor to a trailer for coupling?

18 / 40

The act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others is known as.

19 / 40

If you do become sleepy while driving, you should _____.

20 / 40

In what position should the shut off valves on a the rear of the front trailer be in on a set of double trailers?

21 / 40

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

22 / 40

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

23 / 40

When you have a major leak in the service line and you apply pressure to the brakes, the service air pressure will escape and:

24 / 40

If you park the trailer at an angle to the tractor when uncoupling:

25 / 40

If the hazardous materials are classified as FORBIDDEN you should:

26 / 40

At a railroad crossing, the bus is required to stop at the stop line. If there is no clearly marked stop line, what is the required minimum and maximum stopping distance?

27 / 40

A placard is required for a combustible liquid at?

28 / 40

Make sure____when the front trailer supports are up and the trailer is sitting on the tractor.

29 / 40

Select the best description of a baffle tank:

30 / 40

You must first______to supply air to the trailer.

31 / 40

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

32 / 40

Which of the following statements is true about speed management?

33 / 40

Which of the following materials would be an acceptable floor liner for moving Division 1.1 or 1.2 materials?

34 / 40

The best way to test the low air pressure warning signal is to:

35 / 40

Select the factor that has no effect on how much liquid you can carry:

36 / 40

How often should you drain your air tanks?

37 / 40

Which of the following is NOT something you need to know in order to determine if you need to use placards?

38 / 40

For any flatbed load you must have at least ____ tie downs.

39 / 40

What are the liquid tight separations between compartments inside tanks called?

40 / 40

How should the shut off valves at the rear of the trailer be when inspecting doubles?

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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.