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CDL Tanker Endorsement Practice Test 2026

The tank vehicle (N) endorsement covers trucks that haul liquids or gases in large tanks. These questions cover when the endorsement is needed, tank inspection, surge, baffles and bulkheads, outage, and driving a top-heavy vehicle.

  • Tunga fordon
  • USA
  • 50 frågor
  • Kontrollerad 10 oktober 2026

Kort svar

Det officiella provet har 20 frågor. Godkänt: Varies by state; usually 20 questions, with 16 correct needed (80%). Ansvarig: Your state driver licensing agency, under federal rules set by FMCSA (49 CFR Part 383). Öva gratis här med 50 frågor, alla med svar och förklaring. Kontrollerad mot officiella källor den 10 oktober 2026.

Läs innan du övarBörja med CDL Tanker Endorsement Study Guide: lättlästa anteckningar, illustrationer och siffrorna att komma ihåg.

  1. Fråga 1 av 25

    Under the CDL rules, a tank vehicle carries liquid or gas in tanks of what size?
    Visa svar

    Svar: B. Each over 119 gallons, and 1,000 gallons or more in total

    You need a tank endorsement when individual tanks are rated over 119 gallons and the total is 1,000 gallons or more.

  2. Fråga 2 av 25

    A truck carries three tanks of 400 gallons each, filled with water. Does the driver need a tank endorsement?
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    Svar: A. Yes: each is over 119 gallons and the total is 1,200

    Each tank is over 119 gallons and together they hold 1,000 gallons or more. The liquid does not have to be hazardous.

  3. Fråga 3 av 25

    A truck carries ten 100-gallon tanks of liquid. Is this a tank vehicle under the CDL definition?
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    Svar: C. No, because no single tank is over 119 gallons

    Both parts of the definition must be met: tanks over 119 gallons each and 1,000 gallons or more in total.

  4. Fråga 4 av 25

    Does the liquid in a tank vehicle have to be hazardous for you to need the tank endorsement?
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    Svar: C. No, any liquid or gas counts

    The tank endorsement is about the tank, not what is in it. Milk or water in a large tank counts.

  5. Fråga 5 av 25

    Do tanks that are only temporarily attached to a vehicle count for the tank endorsement?
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    Svar: C. Yes, temporary tanks count too

    The endorsement applies to tanks that are either permanently or temporarily attached to the vehicle.

  6. Fråga 6 av 25

    A Class C vehicle carries hazardous liquid in tanks large enough to be a tank vehicle. What does the driver need?
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    Svar: A. Tank and hazmat endorsements

    Class C drivers need the tank endorsement when hauling hazardous materials in liquid or gas form in tanks of that size, plus the hazmat endorsement.

  7. Fråga 7 av 25

    What kind of test is needed for the tank vehicle (N) endorsement?
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    Svar: D. A knowledge test

    The tank vehicle endorsement requires a knowledge test.

  8. Fråga 8 av 25

    What does the X endorsement mean?
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    Svar: B. You passed both the tank and hazmat tests

    The X endorsement combines tank vehicle (N) and hazardous materials (H).

  9. Fråga 9 av 25

    A CLP holder has an N endorsement on the permit. What may they drive?
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    Svar: C. Only an empty tank vehicle

    A CLP holder with an N endorsement may only operate an empty tank vehicle.

  10. Fråga 10 av 25

    When should you inspect a tank vehicle?
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    Svar: B. Before loading, unloading or driving

    Inspect the tank vehicle before you load, unload or drive it.

  11. Fråga 11 av 25

    What is the most important thing to look for when inspecting a tank vehicle?
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    Svar: C. Leaks under and around it

    Check for leaks anywhere on the vehicle. Carrying product in a leaking tank is a crime.

  12. Fråga 12 av 25

    What can happen to a driver who carries liquid in a leaking tank?
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    Svar: D. They can be cited and made to pay for cleanup

    A leaking tank is treated as a crime. You can be cited, kept from driving further, and made liable for the spill cleanup.

  13. Fråga 13 av 25

    What should you check on the intake, discharge and cut-off valves?
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    Svar: B. That they are in the correct position

    Make sure all valves are in the right position before loading, unloading or moving.

  14. Fråga 14 av 25

    What should you check on manhole covers?
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    Svar: D. That they have gaskets and close properly

    Manhole covers must have gaskets and close correctly. Keep the vents clear.

  15. Fråga 15 av 25

    Which of these is special equipment you may need to check on a tank vehicle?
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    Svar: C. Grounding and bonding cables

    Tank vehicles may have vapor recovery kits, grounding and bonding cables, emergency shut-off systems and built-in fire extinguishers.

  16. Fråga 16 av 25

    Can you drive a tank vehicle with a valve or manhole cover open?
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    Svar: D. No, never

    Never drive a tank vehicle with open valves or manhole covers.

  17. Fråga 17 av 25

    Why do tank vehicles roll over more easily than many other trucks?
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    Svar: D. They have a high center of gravity

    Most of the load's weight sits high above the road, which makes the vehicle top-heavy.

  18. Fråga 18 av 25

    How should you take curves and ramps in a tank vehicle?
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    Svar: D. Well below the posted speed

    Tankers can roll over at the posted speed limits for curves. Take highway curves and ramps well below posted speeds.

  19. Fråga 19 av 25

    What is liquid surge?
    1234
    Visa svar

    Svar: B. Liquid moving back and forth in a tank

    In a partly full tank, the liquid moves. This movement is called surge.

  20. Fråga 20 av 25

    Why is a partly filled tank harder to control than a full one?
    1234
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    Svar: A. The liquid has room to move and surge

    Partly filled tanks let the liquid move, which can push the truck around.

  21. Fråga 21 av 25

    You stop a tank truck that is partly full. What can the surge do?
    1234
    Visa svar

    Svar: B. The wave can push the truck forward

    When you stop, liquid surges forward and back. The wave can push the truck forward, even into an intersection on a slippery road.

  22. Fråga 22 av 25

    On an icy road, why is surge especially dangerous?
    1234
    Visa svar

    Svar: B. It can push a stopped truck into an intersection

    On slippery surfaces, surge can push a stopped truck forward. Know how your vehicle handles.

  23. Fråga 23 av 25

    What are bulkheads in a tank?
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    Svar: C. Walls that divide the tank into compartments

    Bulkheads divide a tank into smaller tanks. When loading, watch the weight distribution.

  24. Fråga 24 av 25

    When loading a tank divided by bulkheads, what must you watch?
    Visa svar

    Svar: B. Not too much weight at the front or rear

    Pay attention to weight distribution so you don't overload the front or rear of the vehicle.

  25. Fråga 25 av 25

    What are baffles in a tank?
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    Svar: A. Bulkheads with holes that let liquid through

    Baffles are bulkheads with holes. They slow front-to-back surge.

Bra att veta före provet

  • Federal rules set the passing score for every CDL knowledge test: you must answer at least 80% of the questions correctly.
  • The tank vehicle test has 20 questions in states such as Washington and Illinois, so you need 16 correct answers.
  • You need the tank endorsement to haul liquid or gas in tanks rated over 119 gallons each and 1,000 gallons or more in total.
  • The tank endorsement needs a knowledge test only.
  • A CLP holder with an N endorsement may drive only an empty tank vehicle.
  • The X endorsement combines tank (N) and hazardous materials (H); you must pass both knowledge tests.

Vanliga frågor

When do I need a tanker endorsement?

When you haul any liquid or gas in tanks rated over 119 gallons each and 1,000 gallons or more in total. The liquid does not have to be hazardous.

How many questions are on the tanker test?

Each state sets the number, but Washington and Illinois both use 20 questions. You need 16 correct to pass.

Is there a skills test for the tank endorsement?

No. Federal rules require only a knowledge test for the tank vehicle endorsement.

What is outage?

Outage is the empty space left at the top of a tank so the liquid can expand as it warms. Never fill a cargo tank all the way.

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