CDL Tanker Endorsement Practice Test 2026：第2套练习测试

1. 第1题，共25题

   What kind of surge do baffles reduce?

   • ASide-to-side surge
   • BAll surge completely
   • CUp-and-down movement only
   • DForward and backward surge
   显示答案

   答案: D. Forward and backward surge

   Baffles control front-to-back surge. Side-to-side surge can still happen and can cause a rollover.

2. 第2题，共25题

   Even with baffles, what kind of surge can still cause a rollover?

   • ASurge only happens in empty tanks
   • BForward surge
   • CSide-to-side surge
   • DBackward surge
   显示答案

   答案: C. Side-to-side surge

   Baffles do not stop side-to-side surge. Take care when steering and on curves.

3. 第3题，共25题

   What is a smooth bore tank?

   • AA tank with nothing inside to slow the liquid
   • BA tank with many baffles to slow the liquid
   • CA tank with solid bulkheads between parts
   • DA tank that is used only for carrying gas
   显示答案

   答案: A. A tank with nothing inside to slow the liquid

   Smooth bore (unbaffled) tanks have no bulkheads or baffles, so forward and back surge is very strong.

4. 第4题，共25题

   Why are smooth bore tanks often used for food products like milk?

   • ABaffles make milk spoil faster
   • BSanitation rules forbid baffles in them
   • CSmooth bore tanks can hold more weight
   • DMilk does not surge in a tank
   显示答案

   答案: B. Sanitation rules forbid baffles in them

   Sanitation rules forbid baffles in tanks for some food products, so these tanks are smooth inside.

5. 第5题，共25题

   When should you be most careful driving a smooth bore tank?

   • AOnly when parked
   • BOnly on straight, flat roads
   • CWhen starting and stopping
   • DOnly when the tank is full to the top
   显示答案

   答案: C. When starting and stopping

   Surge is strongest in smooth bore tanks, so be very careful when starting and stopping.

6. 第6题，共25题

   Which kind of tank has the strongest front-to-back surge?

   • AThey all surge the same
   • BThe smooth bore tank
   • CThe baffled tank
   • DThe tank with solid bulkheads
   显示答案

   答案: B. The smooth bore tank

   With nothing inside to slow the liquid, a smooth bore tank has the strongest forward and backward surge.

7. 第7题，共25题

   What is outage?

   • ASpace left in a tank so the liquid can expand
   • BThe amount of liquid that leaked out
   • CThe time a tank is out of service
   • DThe tank's total capacity
   显示答案

   答案: A. Space left in a tank so the liquid can expand

   Never fill a cargo tank completely. Liquids expand as they warm, so you must leave room called outage.

8. 第8题，共25题

   Why must you never fill a cargo tank to the very top?

   • ALiquids expand as they warm up
   • BFull tanks are too light
   • CThe valves won't close
   • DFull tanks surge more
   显示答案

   答案: A. Liquids expand as they warm up

   Liquids expand when they get warm, and the tank needs room for that expansion.

9. 第9题，共25题

   How much outage do you need?

   • AAlways half of the tank's size
   • BIt depends on the liquid you haul
   • CAlways exactly 10% of the tank
   • DNone at all when hauling water
   显示答案

   答案: B. It depends on the liquid you haul

   Different liquids expand by different amounts, so they need different amounts of outage.

10. 第10题，共25题

    Which things decide how much liquid you can load into a tank?

    • AOnly the weather on the day of the trip
    • BOnly the size of the tank, nothing else
    • COnly what the driver prefers to carry
    • DExpansion, the liquid's weight, and weight limits
    显示答案

    答案: D. Expansion, the liquid's weight, and weight limits

    The amount depends on expansion during transit, the liquid's weight and legal weight limits.

11. 第11题，共25题

    Why are tanks carrying very dense liquids, such as some acids, often only partly loaded?

    • AA full tank could be over the legal weight limit
    • BDense liquids do not surge
    • CPartly full tanks are more stable
    • DAcids must be kept half empty by law in all cases
    显示答案

    答案: A. A full tank could be over the legal weight limit

    Dense liquids are very heavy. A full tank may exceed legal weight limits, so it may be loaded only partway.

12. 第12题，共25题

    Why should a tank vehicle driver be extra careful when steering quickly to avoid a crash?

    • ATankers cannot steer quickly at all
    • BTop-heavy vehicles may flip over
    • CSteering drains the tank
    • DQuick steering is always safer in a tanker
    显示答案

    答案: B. Top-heavy vehicles may flip over

    You can usually turn faster than you can stop, but top-heavy vehicles such as tankers may flip.

13. 第13题，共25题

    A cargo tank used for hazardous materials is empty. Must it still stop before railroad crossings?

    • AOnly if placarded with Class 1
    • BOnly at night
    • CNo, empty tanks never stop
    • DYes, loaded or empty
    显示答案

    答案: D. Yes, loaded or empty

    Cargo tanks used for hazardous materials must stop at railroad crossings whether they are loaded or empty.

14. 第14题，共25题

    Where must a tank vehicle that is required to stop at a railroad crossing stop?

    • A5 to 10 feet from the nearest rail
    • B15 to 50 feet from the nearest rail
    • CAt least 100 feet from the rail
    • DOn the tracks, to look both ways
    显示答案

    答案: B. 15 to 50 feet from the nearest rail

    Vehicles that must stop do so within 50 feet of, and not closer than 15 feet to, the tracks.

15. 第15题，共25题

    How close to a vehicle with an empty tank that held flammable liquid may someone smoke?

    • ANo closer than 5 feet
    • BAnywhere, once the tank is empty
    • CNo closer than 25 feet
    • DNo closer than 10 feet
    显示答案

    答案: C. No closer than 25 feet

    No smoking within 25 feet of vehicles carrying flammable materials or empty tanks that held them.

16. 第16题，共25题

    While a hazmat cargo tank is being loaded or unloaded, where must the person attending it be?

    • AWithin 25 feet, with a clear view
    • BIn the cab with the windows closed
    • CAt least 100 feet away from it
    • DAnywhere on the loading property
    显示答案

    答案: A. Within 25 feet, with a clear view

    The person in charge of loading or unloading must stay within 25 feet and have a clear view.

17. 第17题，共25题

    What must you do before moving a cargo tank that holds hazardous materials?

    • ARemove the gaskets
    • BClose all manholes and valves
    • CLeave the discharge valve open
    • DOpen the vents fully
    显示答案

    答案: B. Close all manholes and valves

    Close all manholes and valves before moving any tank that holds hazardous materials.

18. 第18题，共25题

    When loading flammable liquid into a cargo tank, when must the tank be grounded?

    • AOnly after the loading is completely finished
    • BBefore opening the filling hole until it is closed
    • COnly when it is raining or the ground is wet
    • DNever; cargo tanks do not need to be grounded
    显示答案

    答案: B. Before opening the filling hole until it is closed

    Ground the cargo tank before opening a filling hole and keep it grounded until the hole is closed.

19. 第19题，共25题

    Your tank vehicle is 50 feet long and you are traveling at 50 mph. What following distance should you keep?

    • AAt least 10 seconds
    • BAt least 6 seconds
    • CAt least 4 seconds
    • DAt least 2 seconds
    显示答案

    答案: B. At least 6 seconds

    Allow 1 second per 10 feet (5 seconds) plus 1 second above 40 mph.

20. 第20题，共25题

    How should you drive a tank vehicle on a wet road?

    • ABrake hard and often to test grip
    • BSlow down by about one-third
    • CDrive at your normal speed
    • DSpeed up so the surge settles
    显示答案

    答案: B. Slow down by about one-third

    Wet roads can double stopping distance. Slow down by about one-third.

21. 第21题，共25题

    What should you do when entering a curve in a tank vehicle?

    • AShift to neutral and coast through
    • BSlow down before it, not in it
    • CSpeed up as you enter the curve
    • DBrake hard in the middle of the curve
    显示答案

    答案: B. Slow down before it, not in it

    Slow before the curve. Braking in the curve can cause a skid, and surge plus a high center of gravity raise the rollover risk.

22. 第22题，共25题

    Which statement about tank vehicles and ABS is true?

    • AABS lets you drive faster on curves
    • BABS removes the danger of liquid surge
    • CABS helps you steer but may not shorten stops
    • DABS stops side-to-side surge in the tank
    显示答案

    答案: C. ABS helps you steer but may not shorten stops

    ABS prevents wheel lockup so you can steer. It does not change how liquid surges or always shorten stopping distance.

23. 第23题，共25题

    On a long downgrade in a tank vehicle, how should you control your speed?

    • AA low gear chosen before the grade, and steady braking
    • BHold the brakes down lightly all the way
    • CUse only the parking brake on the grade
    • DCoast down in neutral to save the brakes
    显示答案

    答案: A. A low gear chosen before the grade, and steady braking

    Select a low gear before going down. Use the engine as the main control and brake to about 5 mph below safe speed, then release.

24. 第24题，共25题

    This diagram shows a partly filled tank stopping. Why should you brake early and smoothly?

    • ASo the outage space fills up evenly
    • BSo surge doesn't push the truck forward
    • CSo the liquid cools down on the way
    • DSo the liquid has time to expand
    显示答案

    答案: B. So surge doesn't push the truck forward

    Smooth, early braking reduces the surge that can push the truck forward when you stop.

25. 第25题，共25题

    Why is it important to know how your specific tank vehicle handles?

    • AHandling only matters when the tank is empty
    • BSurge and load height change how it handles
    • CTankers never skid, so speed doesn't matter
    • DAll tankers handle exactly like cars do
    显示答案

    答案: B. Surge and load height change how it handles

    Drivers must know their vehicle well because surge and load height change how it handles.

键盘：按1–4作答，按 Enter 进入下一题。

真实考试：Varies by state; usually 20 questions, with 16 correct needed (80%)