Free CDL Tanker Practice Test 2025
Tanker drivers earn up to $75,000/year - 60% more than standard CDL jobs. Our free practice tests help you pass the N endorsement exam on your first try.
20 questions, 80% to pass
Tanker Endorsement at a Glance
Key facts about the test and the process to get your N endorsement
20
Questions
80%
Passing Score
1-2 weeks
Time to Complete
Free Tanker Practice Test
20 real exam-like questions with instant feedback. See how ready you are!
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How to Get Your Tanker Endorsement
Here's the step-by-step process to add the N endorsement to your CDL.
1
Meet Basic Requirements
You must already hold a valid CDL (Class A, B, or C). No additional background check is required for the Tanker endorsement.
2
Study the CDL Manual
Focus on Section 6: Tank Vehicles. Learn about liquid surge, high center of gravity, baffled vs unbaffled tanks, and emergency procedures.
3
Pass the Written Test
Take the 20-question Tanker knowledge test at your DMV. You need 80% (16 correct) to pass. No skills test required for this endorsement.
4
Get Your CDL Updated
After passing, your CDL is updated with the "N" endorsement. You're now authorized to drive tank vehicles.
Official Resources
Government websites for Tanker endorsement requirements
Want More Practice?
Continue practicing with state-specific Tanker tests based on your CDL manual.
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Frequently Asked Questions
What is a Tanker endorsement?
A Tanker endorsement (code "N") authorizes you to drive vehicles designed to transport liquid or gaseous materials in bulk tanks with a capacity of 1,000 gallons or more. It covers both hazardous and non-hazardous liquids.
Why is driving a tanker different?
Tankers have a high center of gravity, making them prone to rollovers. Liquid cargo creates "surge" - it moves forward when you brake and sideways in turns. This makes controlling the vehicle more challenging than regular trailers.
What is liquid surge?
Surge is the movement of liquid inside a partially filled tank. When you brake, liquid moves forward; when you turn, it moves sideways. This can push your vehicle in unintended directions. Baffles help reduce (but not eliminate) surge.
What's the difference between baffled and unbaffled tanks?
Baffled tanks have internal walls with holes that help reduce liquid surge. Unbaffled (smooth bore) tanks are required for food-grade liquids like milk because baffles are hard to clean. Unbaffled tanks have more severe surge.
How many questions are on the Tanker test?
20 questions, multiple choice. You need 16 right to pass (80%). Most states don't have a time limit.
Do I need a skills test for Tanker endorsement?
No, the Tanker endorsement requires only a written knowledge test. However, if you're getting a Class A CDL for the first time, you'll need to pass the regular CDL skills test.
Can I haul hazardous liquids with just a Tanker endorsement?
No. For hazardous liquids, you need both the Tanker (N) AND HazMat (H) endorsements, combined as the "X" endorsement. The X endorsement requires a TSA background check.
What topics are covered on the Tanker test?
The test covers: tank vehicle inspection, driving techniques for high center of gravity, liquid surge effects, safe following distance, emergency procedures, and loading/unloading procedures.
How much do Tanker drivers earn?
Tanker drivers earn an average of $75,000/year, about 60% more than general freight drivers. Fuel tanker drivers often earn more due to the specialized nature of the work.
How long is the Tanker endorsement valid?
The Tanker endorsement is valid as long as your CDL is valid. When you renew your CDL, you may need to retake the knowledge test (varies by state).
What Test-Takers Say
"My Tanker test was almost word for word from the study tests here. Took only 2 minutes to get 100%."
"Used this for my Texas Tanker test. Every single one of the 20 questions were on the practice test. Perfect score."
"Was at the DMV for 30 minutes. Got 20/20. Way better than paying $500 for a trucking school course."
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