- Updated for January 2025
- Based on 2025 IA commercial driver's license manual
Free IA CDL Tanker Vehicles Practice Test 2025
In Iowa, all drivers are required to have a Tank (N) endorsement to operate vehicles designed to transport significant quantities of liquid or gaseous materials in tanks. With a tank (N) endorsement, you are allowed to transport liquids or gases in tanks individually rated at 119 gallons or more, or with a combined capacity of 1,000 gallons or more.
To obtain such an endorsement on their commercial driver’s license (CDL), all drivers must pass a knowledge test that covers the unique operational procedures associated with these vehicles. After all, you’re responsible for transporting a high volume of potentially dangerous liquids or gases, so it is crucial that you get proper training and master specific aspects such as the dynamics of liquid movement.
Aspiring students who are obtaining a CDL for the first time will also need to pass the standard CDL skills test, which includes a pre-trip inspection, a basic control skills test and a road test. You must pass these tests in a vehicle that is representative of the class of CDL you’re applying for.
There are plenty of online resources that help you prepare for the written exam. While you may already be familiar with the official 2025 CDL manual (https://driving-tests.org/iowa/ia-cdl-handbook/), it’s better to also practice and test the knowledge you have just gained. Our CDL Tanker practice tests are a great place to start since they closely reflect the official exam. Each practice test has 20 questions and is updated for January 2025.
To pass each practice test, you’ll need to provide a correct answer to 80% of the questions. While there are multiple answer options, keep in mind that only one of them is correct. Since there is no time limit, you won’t feel the pressure of a countdown. Take your time to fully understand the question and pick the answer that makes the most sense to you. Detailed feedback is provided after each question, and the question comes with a detailed explanation, so you won’t have to wait until the end to know what went wrong.
Your commercial driver’s license (CDL) is not transferable if you move to another state. Since you’ll have to obtain this endorsement again, make sure to check our tanker endorsement test collection. It features a detailed guide and similar practice tests for all 50 US states, plus Washington, DC.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual IA DOT exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- Side-to-side surge can cause
- How does liquid surge affect the handling of a tanker?
- Hauling liquids in tankers requires special care for which of the following reasons?
- How would you expect a truck with a cargo tank that has baffles to handle on the road?
- A smooth bore tank is also known as
- Empty trucks
- A tank endorsement is required for certain vehicles that transport
- The best way to take a curve in a tanker is to slow to a safe speed before entering the curve and then _________ as you go through it.
- The liquid in a tank with baffles can still have what kind of surge?
- You should be very cautious when driving smooth bore tankers, especially when you are
- You should know the outage needed for the liquids you carry because
- When you load the small tanks of a cargo tank equipped with bulkheads, you should check the
- A baffled tanker is one with
- You are driving on a clear night. You must dim your headlights from high to low. You should adjust your speed so you can stop within
- When your cargo tank has baffles, what handling effect do you expect?
- The movement of the liquid in partially filled tanks is called
- When should the driver of a tanker that has lost its brakes use a truck escape ramp?
- You are driving a tanker truck. The front wheels begin to skid. Which of these is most likely to occur?
- An emergency forces you to stop your tanker quickly or crash. You should
- Which of these statements about tankers are true?
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