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

When should you drain air tanks that do not have an automatic tank drain?

2 / 40

What does the amount of liquid allowed in the tank depend on?

3 / 40

Which trailer is more likely to roll over when pulling 3 trailers?

4 / 40

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

5 / 40

Select the true statement in regards to if a glad hand on the blue air line is missing a seal.

6 / 40

Which trailer is most likely to turn over when you make a sudden turn while pulling doubles?

7 / 40

Suspension systems:

8 / 40

The bus driver must accept responsibility for supervising and controlling students while on the bus route. Who is the person in charge?

9 / 40

What is the standee line?

10 / 40

A placard is required for a combustible liquid at?

11 / 40

When fueling a placarded vehicle, someone must always be:

12 / 40

When a substance in the materials table is written in italics it means :

13 / 40

When you discharge an unruly passenger, you must choose a place that is:

14 / 40

An "A/W" the first column of the hazardous materials table means:

15 / 40

For Division 1.1 or 1.2 Explosives A, should the floor liner required be stainless steel?

16 / 40

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

17 / 40

It is good practice to_____when uncoupling.

18 / 40

Liquid surge affects the handling of a tanker by:

19 / 40

You should___when driving down a long steep hill.

20 / 40

Select the situation in which you should use the hand valve to park a combination vehicle.

21 / 40

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

22 / 40

Your rig should be parked on__to uncouple double trailers.

23 / 40

Select the true statement about empty trucks:

24 / 40

Select the true statement in regards to handing triples and doubles

25 / 40

A portable tank differs from a cargo tank in that ______.

26 / 40

With most hazardous materials, you may park within 5 feet of the road briefly, if your work requires it. The materials that are the exception and do not allow parking this close to the road are:

27 / 40

How do you check the coolant level?

28 / 40

The CDL manual indicates the last step on picking up students at the bus stop is as follows:

29 / 40

What is the next step after securing the bus when you have an unruly child on board?

30 / 40

You should brake on a long steep downgrade hill as a supplement to the braking effects of the engine

31 / 40

Where should you place your warning devices if you must stop on a one-way or divided highway?

32 / 40

With Division 1.1, 1.2, or 1.3 Class A or B, how close can you park to a bridge, tunnel, or building?

33 / 40

When arriving at the destination announce:

34 / 40

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

35 / 40

Select the true statement about stop valves in a cargo tank:

36 / 40

______is a device that connects the service and emergency air lines between the tractor and trailer.

37 / 40

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

38 / 40

What does the drain valve for air tanks remove?

39 / 40

Which is more likely to tip over due to the crack the whip effect?

40 / 40

The minimum tire tread depth for front tires is:

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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.