CDL Tank Vehicle (N) practice test

For the N endorsement, to haul liquids or gases in a tank.

Examlane has 48 Tank Vehicle questions in 4 chapters. The usual test has 20 questions and needs 80% to pass. Some states set a different length: see the state table.

Practice Tank Vehicle

Chapters

Manual section	Chapter	Questions
8.0	Tank vehicles	7
8.1	Inspecting tanks	11
8.2	Driving tanks	17
8.3	Safe driving rules	13

Ten free questions

Open a question to see the answer and why.

1. A Class A driver hauls liquid in tanks that have a large combined capacity. Each tank must be rated for more than how many gallons before a tank endorsement is required?
1. 55 gallons
2. 119 gallons
3. 250 gallons
4. 500 gallons
Answer: B. 119 gallons
Each tank must have a rating over 119 gallons, and the tanks must also add up to a large total capacity.
Based on: CDL manual, Section 8.0 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
2. A driver walks around a tank vehicle before a trip. What is the most important thing to check for on every tank vehicle?
1. Scratches in the paint
2. Dirt buildup on the tank shell
3. Worn mud flaps
4. Signs of leaking
Answer: D. Signs of leaking
Leaks are the top concern on every tank vehicle, so look beneath and beside the vehicle for any sign of one.
Based on: CDL manual, Section 8.1.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
3. What does it mean that a tank vehicle has a high center of gravity?
1. Most of the load's weight sits low between the axles
2. A large share of the load's weight rides high off the road
3. All of the weight is over the rear axle
4. The weight shifts evenly from side to side
Answer: B. A large share of the load's weight rides high off the road
A large share of the weight rides high above the pavement, so the vehicle is top-heavy and tips over easily.
Based on: CDL manual, Section 8.2.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
4. Why must a tank driver start, slow down, and stop very smoothly?
1. Tank vehicles sit top-heavy and the liquid inside surges
2. Tank trailers have weaker brakes than other trailers
3. Tank engines make less power at low speed
4. Liquid cargo is always hazardous
Answer: A. Tank vehicles sit top-heavy and the liquid inside surges
Because the weight rides high and the liquid surges, sudden changes in speed are dangerous.
Based on: CDL manual, Section 8.3.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
5. A Class B driver hauls plain water in tanks that meet the rated capacity limits. Is a tank endorsement required?
1. Yes, even if the liquid is harmless
2. No, only hazardous liquids require it
3. No, only gases carried in tanks require it
4. No, only Class C vehicles require it
Answer: A. Yes, even if the liquid is harmless
The cargo does not need to be a hazardous material. Any liquid or gas in tanks of the rated size calls for the endorsement.
Based on: CDL manual, Section 8.0 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
6. What can happen to a driver who hauls liquid in a leaking tank?
1. A warning only, if the leak is small and you promise to fix it soon
2. A citation, a ban on driving further, and possible cleanup costs
3. Nothing, if the liquid is harmless
4. A delay at the next weigh station only
Answer: B. A citation, a ban on driving further, and possible cleanup costs
Hauling in a leaking tank is a crime. The driver is cited, kept from driving further, and may have to pay for cleaning up a spill.
Based on: CDL manual, Section 8.1.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
7. A liquid tanker enters a highway curve. At what speed can it tip over?
1. Only when going well over the posted limit
2. Only on wet or icy roads
3. Even at the speed limit posted for the curve
4. Only when the tank is nearly empty
Answer: C. Even at the speed limit posted for the curve
Testing has found that a tanker can roll over even when it takes a curve at the posted speed, so that speed is not a safe guide.
Based on: CDL manual, Section 8.2.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
8. Besides starting and stopping, how should a tank driver make turns and lane changes?
1. Quickly, to get them over with
2. Smoothly and gradually
3. Sharply, then straighten out right away
4. The same way as in an empty truck
Answer: B. Smoothly and gradually
Turns and lane changes should be smooth, just like starting, slowing, and stopping.
Based on: CDL manual, Section 8.3.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
9. For a Class C vehicle, which kind of load makes a tank endorsement required?
1. Any liquid cargo, hazardous or harmless
2. Hazardous materials packed in boxes, drums, or crates
3. Hazardous liquid or gas in tanks of the rated size
4. Any liquid food product
Answer: C. Hazardous liquid or gas in tanks of the rated size
A Class C vehicle needs the endorsement only when its cargo is a hazardous liquid or gas carried in tanks of the rated size.
Based on: CDL manual, Section 8.0 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.
10. What should a driver make sure of when checking the manhole covers on a tank?
1. They have gaskets and close correctly
2. They stay cracked open to let pressure out
3. They are fastened with tape instead of gaskets
4. They have the tank's capacity stamped on them
Answer: A. They have gaskets and close correctly
Manhole covers need gaskets and must close correctly so the tank is properly sealed.
Based on: CDL manual, Section 8.1.1 (Georgia edition of the national model manual, read 2026-10-24). Question in our own words.

This is practice for the knowledge test. It is not Entry-Level Driver Training and does not count toward any federal training requirement.