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

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

2 / 40

You should be in the proper gear before going down a hill because:

3 / 40

Operating a motor vehicle with the intent of doing harm to others or physically assaulting a driver or their vehicle is known as?

4 / 40

When should you not use the parking brakes?

5 / 40

Select the true statement about emergency steering and tankers:

6 / 40

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

7 / 40

How much space should there be between the lower and upper fifth wheel?

8 / 40

How can you determine if your vehicle is equipped with ABS?

9 / 40

To be sure that air is supplied to the second trailer:

10 / 40

Select the statement that is true in regards to what is required of a driver with a double or triple trailers:

11 / 40

A driver that hauls hazardous materials must attend training every:

12 / 40

Another term for a smooth bore tank is:

13 / 40

Start by___when coupling.

14 / 40

Before pulling away, make sure the landing gear of the trailer is:

15 / 40

The driver's manual advises you to disconnect the steering axle brake to keep the rig straight:

16 / 40

What are the 3 methods for securing a second trailer before coupling?

17 / 40

Your vehicle is going down a long hill and your brakes begin to fail. What should you do?

18 / 40

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

19 / 40

You can be sure air is supplied to the second trailer by:

20 / 40

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

21 / 40

The two main things to look ahead for while driving are _____.

22 / 40

What are the three hazard classes should NOT be loaded into a trailer that has a heater air conditioner unit?

23 / 40

Which two special conditions indicate that you should downshift?

24 / 40

When fueling a placarded vehicle, someone must always be:

25 / 40

The container for the mechanism that transforms the steering column action into wheel action is:

26 / 40

When stopped on a divided highway where should your reflectors be placed?

27 / 40

A disruptive passenger:

28 / 40

At what pressure is the safety valve in the air compressor tank set to open?

29 / 40

If you are required to stop at railroad crossings, you must:

30 / 40

Air brake systems should not lose air faster than____when testing for air leakage rates in combination vehicles before applying the brake pedal.

31 / 40

What is the best way to prevent brakes form overheating while drive down a steep grade?

32 / 40

When should you avoid using the parking brake?

33 / 40

The walls that separate compartments inside the tanks and having openings at the top and bottom are called:

34 / 40

When driving normally, some drivers use the hand valve before applying the brake pedal to prevent jack knifing. Select the most appropriate response to this statement.

35 / 40

What is the most important reason for doing a school bus inspection?

36 / 40

The average person requires how many hours of sleep per 24 hour period?

37 / 40

Which of the following is a clue another driver is impaired:

38 / 40

A leak rate for a straight truck or bus air brake system should not exceed _____psi per minute when the engine is off and the brakes are released.

39 / 40

When this item is missing or loose, movement may occur between the fifth wheel assembly and the frame.

40 / 40

When transporting both hazardous and non hazardous materials, your bills must:

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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.