CDL Tanker Endorsement Practice Test 2026

1. السؤال 1 من 25

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

   • AAny single tank of 500 gallons or more
   • BEach over 119 gallons, and 1,000 gallons or more in total
   • CEach over 50 gallons, and 500 gallons or more in total
   • DOnly tanks of 5,000 gallons or more
   أظهر الإجابة

   الإجابة: 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. السؤال 2 من 25

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

   • AYes: each is over 119 gallons and the total is 1,200
   • BNo, because water is not a hazardous material
   • CNo, because no single tank holds 1,000 gallons
   • DOnly if the truck is fitted with air brakes
   أظهر الإجابة

   الإجابة: 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. السؤال 3 من 25

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

   • AOnly if the liquid is fuel
   • BYes, any tank truck counts
   • CNo, because no single tank is over 119 gallons
   • DYes, because the total is 1,000 gallons
   أظهر الإجابة

   الإجابة: 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. السؤال 4 من 25

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

   • AOnly gases count
   • BYes, only hazardous liquids count
   • CNo, any liquid or gas counts
   • DOnly flammable liquids count
   أظهر الإجابة

   الإجابة: 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. السؤال 5 من 25

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

   • AOnly if they are welded in place
   • BNo, only permanent tanks count
   • CYes, temporary tanks count too
   • DOnly if they are completely full
   أظهر الإجابة

   الإجابة: C. Yes, temporary tanks count too

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

6. السؤال 6 من 25

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

   • ATank and hazmat endorsements
   • BOnly a passenger endorsement
   • CNo endorsement
   • DOnly a doubles endorsement
   أظهر الإجابة

   الإجابة: 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. السؤال 7 من 25

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

   • AA skills test only
   • BA knowledge test and a road test in a tanker
   • CNo test
   • DA knowledge test
   أظهر الإجابة

   الإجابة: D. A knowledge test

   The tank vehicle endorsement requires a knowledge test.

8. السؤال 8 من 25

   What does the X endorsement mean?

   • AYou may pull triple trailers on highways
   • BYou passed both the tank and hazmat tests
   • CYou may drive any type of commercial vehicle
   • DYou are allowed to give CDL skills tests
   أظهر الإجابة

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

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

9. السؤال 9 من 25

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

   • ATank vehicles under 5,000 gallons
   • BAny tank vehicle with a CDL holder present
   • COnly an empty tank vehicle
   • DTank vehicles carrying water only
   أظهر الإجابة

   الإجابة: C. Only an empty tank vehicle

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

10. السؤال 10 من 25

    When should you inspect a tank vehicle?

    • AOnly when you see a leak
    • BBefore loading, unloading or driving
    • COnly after you finish unloading
    • DOnly once a week, at the yard
    أظهر الإجابة

    الإجابة: B. Before loading, unloading or driving

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

11. السؤال 11 من 25

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

    • ADents in the cab
    • BA clean windshield
    • CLeaks under and around it
    • DMud on the tires
    أظهر الإجابة

    الإجابة: C. Leaks under and around it

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

12. السؤال 12 من 25

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

    • ANothing, as long as the leak is small
    • BOnly a warning, the first time it happens
    • CNothing; only the shipper is responsible
    • DThey can be cited and made to pay for cleanup
    أظهر الإجابة

    الإجابة: 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. السؤال 13 من 25

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

    • AThat they are freshly painted
    • BThat they are in the correct position
    • CThat they are removed for cleaning
    • DThat they are all fully open
    أظهر الإجابة

    الإجابة: B. That they are in the correct position

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

14. السؤال 14 من 25

    What should you check on manhole covers?

    • AThat they are removed while driving
    • BThat they are open for air
    • CThat they are locked open
    • DThat they have gaskets and close properly
    أظهر الإجابة

    الإجابة: D. That they have gaskets and close properly

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

15. السؤال 15 من 25

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

    • AA trailer hitch ball
    • BA sleeper berth
    • CGrounding and bonding cables
    • DSnow tires and chains
    أظهر الإجابة

    الإجابة: 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. السؤال 16 من 25

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

    • AYes, if the tank is empty
    • BYes, on short trips
    • CYes, for ventilation
    • DNo, never
    أظهر الإجابة

    الإجابة: D. No, never

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

17. السؤال 17 من 25

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

    • AThey are always driven empty
    • BThey have no suspension at all
    • CThey have very small tires
    • DThey have a high center of gravity
    أظهر الإجابة

    الإجابة: 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. السؤال 18 من 25

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

    • AIn neutral
    • BAt the posted speed
    • CSlightly above the posted speed
    • DWell below the posted speed
    أظهر الإجابة

    الإجابة: 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. السؤال 19 من 25

    What is liquid surge?

    • ALiquid leaking out of a loose valve
    • BLiquid moving back and forth in a tank
    • CLiquid expanding in hot weather
    • DLiquid freezing inside the tank
    أظهر الإجابة

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

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

20. السؤال 20 من 25

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

    • AThe liquid has room to move and surge
    • BIt weighs more
    • CIt has a lower center of gravity
    • DIts brakes are weaker
    أظهر الإجابة

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

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

21. السؤال 21 من 25

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

    • AIt pulls the truck backward only
    • BThe wave can push the truck forward
    • CNothing; the liquid stays still
    • DIt raises the pressure in the tank
    أظهر الإجابة

    الإجابة: 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. السؤال 22 من 25

    On an icy road, why is surge especially dangerous?

    • AIt locks the steering wheel in one position
    • BIt can push a stopped truck into an intersection
    • CIt turns off the brakes on the rear axles
    • DIt makes the liquid in the tank freeze faster
    أظهر الإجابة

    الإجابة: 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. السؤال 23 من 25

    What are bulkheads in a tank?

    • ACovers over the hatches on top of the tank
    • BLadders on the side of the tank for climbing
    • CWalls that divide the tank into compartments
    • DValves at the bottom of the tank for unloading
    أظهر الإجابة

    الإجابة: C. Walls that divide the tank into compartments

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

24. السؤال 24 من 25

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

    • AThat all compartments stay empty on the trip
    • BNot too much weight at the front or rear
    • CThat the bulkheads are removed before loading
    • DThat every compartment is filled to the top
    أظهر الإجابة

    الإجابة: 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. السؤال 25 من 25

    What are baffles in a tank?

    • ABulkheads with holes that let liquid through
    • BHoses that connect two tanks together
    • CCovers that seal the manholes on top
    • DSolid walls with no openings at all
    أظهر الإجابة

    الإجابة: A. Bulkheads with holes that let liquid through

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

لوحة المفاتيح: 1–4 للإجابة، وEnter للسؤال التالي.

الاختبار الحقيقي: Varies by state; usually 20 questions, with 16 correct needed (80%)