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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.

  • Bedrijfsvoertuig
  • Verenigde Staten
  • 50 vragen
  • Gecontroleerd op 10 oktober 2026

Kort antwoord

Het officiële examen heeft 20 vragen. Geslaagd: Varies by state; usually 20 questions, with 16 correct needed (80%). Afgenomen door: Your state driver licensing agency, under federal rules set by FMCSA (49 CFR Part 383). Oefen hier gratis met 50 vragen, elk met het antwoord en een uitleg. Gecontroleerd aan de hand van officiële bronnen op 10 oktober 2026.

Lees dit voordat je gaat oefenenBegin met de CDL Tanker Endorsement Study Guide: notities in begrijpelijke taal, schema’s en de getallen die je moet onthouden.

  1. Vraag 1 van 25

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

    Antwoord: 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. Vraag 2 van 25

    A truck carries three tanks of 400 gallons each, filled with water. Does the driver need a tank endorsement?
    Toon antwoord

    Antwoord: 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. Vraag 3 van 25

    A truck carries ten 100-gallon tanks of liquid. Is this a tank vehicle under the CDL definition?
    Toon antwoord

    Antwoord: 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. Vraag 4 van 25

    Does the liquid in a tank vehicle have to be hazardous for you to need the tank endorsement?
    Toon antwoord

    Antwoord: 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. Vraag 5 van 25

    Do tanks that are only temporarily attached to a vehicle count for the tank endorsement?
    Toon antwoord

    Antwoord: C. Yes, temporary tanks count too

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

  6. Vraag 6 van 25

    A Class C vehicle carries hazardous liquid in tanks large enough to be a tank vehicle. What does the driver need?
    Toon antwoord

    Antwoord: 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. Vraag 7 van 25

    What kind of test is needed for the tank vehicle (N) endorsement?
    Toon antwoord

    Antwoord: D. A knowledge test

    The tank vehicle endorsement requires a knowledge test.

  8. Vraag 8 van 25

    What does the X endorsement mean?
    Toon antwoord

    Antwoord: B. You passed both the tank and hazmat tests

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

  9. Vraag 9 van 25

    A CLP holder has an N endorsement on the permit. What may they drive?
    Toon antwoord

    Antwoord: C. Only an empty tank vehicle

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

  10. Vraag 10 van 25

    When should you inspect a tank vehicle?
    Toon antwoord

    Antwoord: B. Before loading, unloading or driving

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

  11. Vraag 11 van 25

    What is the most important thing to look for when inspecting a tank vehicle?
    Toon antwoord

    Antwoord: C. Leaks under and around it

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

  12. Vraag 12 van 25

    What can happen to a driver who carries liquid in a leaking tank?
    Toon antwoord

    Antwoord: 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. Vraag 13 van 25

    What should you check on the intake, discharge and cut-off valves?
    Toon antwoord

    Antwoord: B. That they are in the correct position

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

  14. Vraag 14 van 25

    What should you check on manhole covers?
    Toon antwoord

    Antwoord: D. That they have gaskets and close properly

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

  15. Vraag 15 van 25

    Which of these is special equipment you may need to check on a tank vehicle?
    Toon antwoord

    Antwoord: 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. Vraag 16 van 25

    Can you drive a tank vehicle with a valve or manhole cover open?
    Toon antwoord

    Antwoord: D. No, never

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

  17. Vraag 17 van 25

    Why do tank vehicles roll over more easily than many other trucks?
    Toon antwoord

    Antwoord: 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. Vraag 18 van 25

    How should you take curves and ramps in a tank vehicle?
    Toon antwoord

    Antwoord: 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. Vraag 19 van 25

    What is liquid surge?
    1234
    Toon antwoord

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

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

  20. Vraag 20 van 25

    Why is a partly filled tank harder to control than a full one?
    1234
    Toon antwoord

    Antwoord: A. The liquid has room to move and surge

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

  21. Vraag 21 van 25

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

    Antwoord: 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. Vraag 22 van 25

    On an icy road, why is surge especially dangerous?
    1234
    Toon antwoord

    Antwoord: 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. Vraag 23 van 25

    What are bulkheads in a tank?
    Toon antwoord

    Antwoord: C. Walls that divide the tank into compartments

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

  24. Vraag 24 van 25

    When loading a tank divided by bulkheads, what must you watch?
    Toon antwoord

    Antwoord: 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. Vraag 25 van 25

    What are baffles in a tank?
    Toon antwoord

    Antwoord: A. Bulkheads with holes that let liquid through

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

Wat je moet weten voor het examen

  • 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.

Veelgestelde vragen

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.

Bronnen

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