1. During an in-route check at a rest stop, you notice liquid dripping from the rear of your tank trailer near a manhole cover. What should you do first?

2. When transporting food-grade liquids in a tank vehicle, what additional requirement must be met compared to non-food-grade liquid transport?

3. A baffled tank has holes in each baffle plate. Why must these holes be kept clear and not blocked or sealed?

4. During an emergency stop on the shoulder of a highway, a tank driver discovers a small crack in the tank shell leaking non-flammable liquid. The driver has warning triangles, a fire extinguisher, and a phone. Analyze the correct response sequence.

5. After unloading all hazardous cargo from a cargo tank at a delivery site, when may the placards be removed from the tank?

6. A shipper provides a driver with a loading chart showing that for a particular chemical, 3% outage is required at 70°F and 5% outage is required at 100°F. The loading temperature is 85°F. What outage should the driver ensure?

7. Two identical tanks are loaded at the same temperature. Tank A contains water (low expansion coefficient) and Tank B contains gasoline (high expansion coefficient). Both are loaded with the same outage percentage. If both experience a 40°F temperature increase during transport, what will occur?

8. When performing a pre-trip inspection on a tank vehicle equipped with a bottom-loading system, which component requires specific attention to ensure it does not leak during transport?

9. Where must placards be displayed on a cargo tank motor vehicle?

10. Compared to a loaded dry van of the same GVWR, a loaded tank vehicle typically requires how much additional stopping distance?

11. A driver is preparing to transport liquid nitrogen in an MC-338 cryogenic tank. During loading, the driver notices ice buildup on the exterior of the tank near a valve connection. Is this normal, and what does it indicate?

12. You are loading a multi-compartment tank trailer with three different grades of gasoline. After loading each compartment, what must you verify before moving to the next?

13. A new driver with a Tanker (N) endorsement is assigned to transport two products: gasoline in the front and middle compartments (totaling 7,000 gallons) and diesel in the rear compartment (2,500 gallons). The driver needs to make two separate deliveries. Which practice ensures product integrity and safety during multi-stop delivery?

14. Compare the stopping distance of a fully loaded baffled tank vehicle to an empty tank vehicle of the same type on dry pavement at 55 mph. Which statement is correct?

15. A driver is hauling milk in a smooth bore stainless steel tank that is 70% full. While approaching a stop sign on a slight downgrade, the driver brakes normally. Suddenly the truck lurches forward despite brake pressure. What is happening and what should the driver do?

16. A driver begins a pre-trip inspection on a DOT-406 gasoline tanker. The emergency valve shutoff cable moves freely but does not actually close the internal valve when pulled. Analyze the significance of this finding.

17. After completing the unloading of a flammable liquid from a cargo tank, what procedure must be followed before disconnecting the ground and bonding cables?

18. If a pressurized cargo tank (MC-331) carrying propane is involved in a crash and begins venting gas from the relief valve, what is the most immediate danger?

19. Where should the driver keep the Emergency Response Guidebook (ERG) or equivalent emergency response information during transport of hazardous cargo in a tank vehicle?

20. A driver is assigned to transport liquid oxygen at extremely low temperatures. Which type of cargo tank must be used for this shipment?

21. A “tank vehicle” for CDL purposes is defined as any vehicle designed to transport liquid or gaseous materials in a tank having a capacity of how many gallons or more?

22. A tank trailer has bulkheads (baffles) with openings at the bottom to allow liquid to flow between compartments while still controlling surge. What is the primary purpose of this design?

23. A tank driver is on a highway and a passenger car suddenly cuts in front, reducing the following distance to about 1.5 seconds. Traffic is moderate and the tank is 80% full with an unbaffled tank. Analyze the safest response.

24. Why is a tank vehicle fire generally more dangerous and harder to extinguish than a fire in a dry van or box trailer?

25. What happens if a non-pressurized cargo tank is loaded to 100% capacity (zero outage) with a liquid that has a significant thermal expansion coefficient?

26. A driver is hauling cryogenic liquid oxygen (LOX) in an MC-338 tank. Which of the following is a specific hazard unique to oxygen that the driver must be aware of?

27. When unloading a tank vehicle by gravity through a bottom outlet, which action helps prevent a hazardous surge of liquid at the beginning of the discharge?

28. A driver is unloading a corrosive liquid from an MC-312 tank and notices that the discharge hose has developed a small crack leaking product. The receiving vessel is 60% full. Analyze the correct response.

29. Which factor has the greatest influence on the amount of outage required for a given liquid cargo?

30. What is the primary reason a tank vehicle driver must check for liquid in the cleanout ports or between compartments during pre-trip inspection?

31. A driver is inspecting a tank trailer at an in-route stop. The cargo is a non-hazardous liquid, and the driver notices the temperature gauge on the tank reads significantly higher than at departure. The tank is a non-pressurized DOT-406 type. What is the correct analysis?

32. Which of the following best describes a “cargo tank” as defined by FMCSA regulations?

33. You are inspecting a smooth bore (non-baffled) stainless steel tank trailer. For which type of cargo is this tank most likely designed?

34. Why is it particularly dangerous to transport flammable liquids in unbaffled tanks through tunnels or underground facilities?

35. What type of cargo tank construction is required for transporting anhydrous ammonia?

36. During a pre-trip inspection of a tank vehicle, the driver checks the tank’s specification plate. Which piece of information on the plate is most critical for determining whether the tank is legal for a specific cargo?

37. A driver hauling gasoline in a DOT-406 tank notices smoke coming from the rear trailer wheels while on the highway. What is the first action the driver should take?

38. A carrier has both MC-331 and MC-338 cargo tanks in its fleet. A customer requests transport of liquid argon at –186°C. Analyze which tank is appropriate and why.

39. During inspection of a tank vehicle’s test and inspection markings, you notice the cargo tank’s retest date expired 45 days ago. What is the correct analysis of this situation?

40. What is the primary reason a tank vehicle driver must know the outage (ullage) requirements before loading a liquid cargo?

41. A pressurized MC-331 tank is used to transport carbon dioxide (CO2) in liquid form. Why must the driver be particularly attentive to the pressure gauge during transport?

42. A pressurized MC-331 cargo tank is used to transport anhydrous ammonia. Why does the outage calculation for pressurized cargo differ from that of non-pressurized cargo tanks?

43. In a partially filled unbaffled (smooth bore) tank, what happens to the vehicle when the driver applies the brakes?

44. A driver compares a baffled tank with an unbaffled (smooth bore) tank of equal capacity. Which statement correctly analyzes the difference in handling characteristics?

45. A tank vehicle is being loaded at a facility and the driver notices that the loading facility’s meter and the tank’s internal level gauge disagree by more than 5% on the volume loaded. What is the most likely explanation and correct action?

46. What is the minimum size requirement for placards displayed on a cargo tank motor vehicle?

47. A tank vehicle driver is approaching a railroad crossing that does not have active warning devices (no gates or lights). The tank is loaded with flammable liquid. What must the driver do?

48. A driver completes a trip with a cargo tank that hauled hazardous material and is now returning empty to the terminal. What three things must the driver verify before removing placards and considering the tank “uncontaminated”?

49. A cargo tank’s specification plate (metal nameplate) indicates the tank is an MC-331 rated for 250 psi working pressure. The driver is asked to load a material requiring a 300 psi tank. Analyze whether this load is permissible.

50. A driver is loading a tank vehicle and needs to distribute weight properly across the axles. If the front axle is underweight but the rear tandem is at maximum capacity, what is the best course of action?