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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.

  • Pojazdy ciężarowe
  • Stany Zjednoczone
  • Pytania: 50
  • Sprawdzono 10 października 2026

W skrócie

Oficjalny egzamin ma 20 pytań. Aby zdać: Varies by state; usually 20 questions, with 16 correct needed (80%). Egzamin przeprowadza: Your state driver licensing agency, under federal rules set by FMCSA (49 CFR Part 383). Ćwicz tu za darmo na 50 pytaniach, każde z odpowiedzią i wyjaśnieniem. Sprawdzono z oficjalnymi źródłami 10 października 2026.

Przeczytaj, zanim zaczniesz ćwiczyćZacznij od przewodnika CDL Tanker Endorsement Study Guide: przystępne notatki, rysunki i liczby do zapamiętania.

  1. Pytanie 1 z 25

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

    Odpowiedź: 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. Pytanie 2 z 25

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

    Odpowiedź: 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. Pytanie 3 z 25

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

    Odpowiedź: 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. Pytanie 4 z 25

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

    Odpowiedź: 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. Pytanie 5 z 25

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

    Odpowiedź: C. Yes, temporary tanks count too

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

  6. Pytanie 6 z 25

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

    Odpowiedź: 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. Pytanie 7 z 25

    What kind of test is needed for the tank vehicle (N) endorsement?
    Pokaż odpowiedź

    Odpowiedź: D. A knowledge test

    The tank vehicle endorsement requires a knowledge test.

  8. Pytanie 8 z 25

    What does the X endorsement mean?
    Pokaż odpowiedź

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

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

  9. Pytanie 9 z 25

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

    Odpowiedź: C. Only an empty tank vehicle

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

  10. Pytanie 10 z 25

    When should you inspect a tank vehicle?
    Pokaż odpowiedź

    Odpowiedź: B. Before loading, unloading or driving

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

  11. Pytanie 11 z 25

    What is the most important thing to look for when inspecting a tank vehicle?
    Pokaż odpowiedź

    Odpowiedź: C. Leaks under and around it

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

  12. Pytanie 12 z 25

    What can happen to a driver who carries liquid in a leaking tank?
    Pokaż odpowiedź

    Odpowiedź: 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. Pytanie 13 z 25

    What should you check on the intake, discharge and cut-off valves?
    Pokaż odpowiedź

    Odpowiedź: B. That they are in the correct position

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

  14. Pytanie 14 z 25

    What should you check on manhole covers?
    Pokaż odpowiedź

    Odpowiedź: D. That they have gaskets and close properly

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

  15. Pytanie 15 z 25

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

    Odpowiedź: 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. Pytanie 16 z 25

    Can you drive a tank vehicle with a valve or manhole cover open?
    Pokaż odpowiedź

    Odpowiedź: D. No, never

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

  17. Pytanie 17 z 25

    Why do tank vehicles roll over more easily than many other trucks?
    Pokaż odpowiedź

    Odpowiedź: 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. Pytanie 18 z 25

    How should you take curves and ramps in a tank vehicle?
    Pokaż odpowiedź

    Odpowiedź: 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. Pytanie 19 z 25

    What is liquid surge?
    1234
    Pokaż odpowiedź

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

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

  20. Pytanie 20 z 25

    Why is a partly filled tank harder to control than a full one?
    1234
    Pokaż odpowiedź

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

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

  21. Pytanie 21 z 25

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

    Odpowiedź: 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. Pytanie 22 z 25

    On an icy road, why is surge especially dangerous?
    1234
    Pokaż odpowiedź

    Odpowiedź: 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. Pytanie 23 z 25

    What are bulkheads in a tank?
    Pokaż odpowiedź

    Odpowiedź: C. Walls that divide the tank into compartments

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

  24. Pytanie 24 z 25

    When loading a tank divided by bulkheads, what must you watch?
    Pokaż odpowiedź

    Odpowiedź: 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. Pytanie 25 z 25

    What are baffles in a tank?
    Pokaż odpowiedź

    Odpowiedź: A. Bulkheads with holes that let liquid through

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

Co warto wiedzieć przed egzaminem

  • 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.

Najczęściej zadawane pytania

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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