How many questions are on the West Virginia CDL knowledge test?

The West Virginia CDL general knowledge test has 50 multiple-choice questions, and you need 80% (40 correct) to pass. Each endorsement test like Tanker is shorter (typically 20-30 questions) but uses the same 80% threshold.

What's the minimum age for a CDL in West Virginia?

In West Virginia, the minimum age for a CDL is 18 (intrastate); 21 (interstate). Federal law requires drivers to be 21+ to drive a CMV across state lines or to transport hazardous materials, regardless of state minimum age.

What is the difference between the N endorsement and the X endorsement?

The N endorsement is for tanker vehicles only, meaning liquid or gas cargo in non-hazardous quantities. The X endorsement is a combination of Tanker (N) and HazMat (H), required when you transport hazardous materials in a tank vehicle, such as fuel tankers or chemical tankers. To get an X endorsement, you must pass both the tanker and HazMat knowledge tests.

Why is a partial load more dangerous than a full tank?

A partially filled tank allows liquid to slosh from side to side and front to back, creating liquid surge. This surge can push the vehicle in the direction the liquid moves, making it harder to control during braking, turning, and lane changes. A full tank has minimal surge because there is little room for the liquid to move.

What are baffles in a tank vehicle?

Baffles are internal walls inside a tank that have holes in them to allow liquid to flow through. They reduce the front-to-back surge of liquid, making the vehicle easier to control during braking and acceleration. However, baffles do not prevent side-to-side surge. Smooth-bore (unbaffled) tanks have no internal walls and are used for liquids like milk that must be easily sanitized.

Do I need ELDT for a tanker endorsement?

Yes. Since February 2022, first-time tanker endorsement applicants must complete Entry-Level Driver Training (ELDT) through an FMCSA-registered training provider. This applies to anyone adding the N endorsement for the first time. It does not apply if you are renewing or transferring an existing tanker endorsement.

What vehicles require a tanker endorsement?

Any commercial vehicle designed to transport any liquid or gaseous material in a tank or tanks with an individual rated capacity of 119 gallons or more, or a combined rated capacity of 1,000 gallons or more, requires a tanker endorsement. This includes fuel tankers, water trucks, milk tankers, and portable tank containers.

West Virginia CDL tanker practice test

Updated for 2026 · 35 tanker questions of 441 across the full WV CDL path · Aligned to the commercial driver manual · Part of the WV CDL path

Start with general knowledge first. We recommend completing it before drilling tanker questions.

Combine Tanker with HazMat (the X endorsement) if you plan to haul fuel or chemical tankers — that's the highest-paying tanker work.

Go to general knowledge →

Drive vehicles with liquid or gas tanks. Surge dynamics and load limits.

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2 tests, each drawing from a different question pool. Take all 2 to cover the full 35 questions.

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15 random questions from the tanker pool. Try it free.

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35 questions covering the full tanker bank. Take when you're ready for everything.

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Drill every question in this section with full explanations.

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About the West Virginia Tanker test

The Tanker knowledge test usually has 20 to 30 multiple-choice questions with an 80% passing score. Questions focus on liquid surge and its effect on vehicle handling, the dangers of partial loads vs. full loads, proper braking and cornering techniques for tank vehicles, baffled vs. unbaffled tanks, outage requirements (why tanks are never filled completely), and emergency procedures. If you are combining the tanker endorsement with HazMat (X endorsement), expect additional questions on hazardous liquid transport. In West Virginia, this test is administered by the DMV as part of the standard CDL knowledge exam - review the West Virginia CDL manual section on tanker for the most accurate state-specific content.