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CDL Hazardous Materials Endorsement (HME) practice questions

200 free questions with answers and explanations.

Practice test
  1. 151.A consignor is preparing a portable tank for a hazardous material shipment. Which type of portable tank is typically used for transporting non-refrigerated liquefied compressed gases, with test pressures generally ranging from 100 psi to 500 psi?Bulk Tanks and Other Containers
  2. 152.A driver is transporting a liquid hazardous material in a cargo tank. The cargo tank must be equipped with an internal self-closing stop valve for each opening below the liquid level. What is the primary purpose of this valve?Bulk Tanks and Other Containers
  3. 153.A driver is preparing to transport a hazardous material in an Intermediate Bulk Container (IBC). Which of the following is considered a bulk packaging, and therefore subject to bulk packaging regulations, including placarding, if applicable?Bulk Tanks and Other Containers
  4. 154.A consignor is preparing a bulk shipment of a liquid hazardous material with a specific gravity of 1.25. The cargo tank has a maximum rated capacity of 7,000 gallons. If the maximum filling density allowed for this material is 90%, what is the maximum weight (in pounds) of the material that can be loaded into the tank? (Assume water weighs 8.34 lbs/gallon).Bulk Tanks and Other Containers
  5. 155.A portable tank is being used to transport a hazardous material. Which of the following is a marking that must be permanently affixed to the tank and visible for inspection?Bulk Tanks and Other Containers
  6. 156.A driver is inspecting a portable tank before loading a hazardous material. Which of the following conditions would immediately render the tank unsuitable for transport?Bulk Tanks and Other Containers
  7. 157.A carrier is preparing to transport a bulk quantity of a hazardous material that is a liquid with a flash point of 105°F (40.5°C). The material is in a bulk packaging designed for liquids. According to hazardous materials regulations, what classification applies to this material?Bulk Tanks and Other Containers
  8. 158.A driver is transporting Class 5.2 (Organic Peroxides) and Class 3 (Flammable Liquids) in separate packages on the same vehicle. According to the segregation table, what is the required segregation for these two hazard classes?Loading and Unloading Hazardous Materials
  9. 159.A cargo tank motor vehicle is transporting a non-pressure liquid hazardous material. The cargo tank is equipped with an internal self-closing stop valve. Federal regulations require that this valve must be designed to close automatically when activated by specific types of systems. Which of the following is NOT a federally mandated system for automatic closure of an internal stop valve on a cargo tank carrying non-pressure liquid hazardous materials?Bulk Tanks and Other Containers
  10. 160.A driver is transporting a shipment that includes 800 pounds of UN1830, Sulfuric acid (Class 8, PG II), and 300 pounds of UN1760, Corrosive liquid, N.O.S. (Class 8, PG III). Which of the following statements about placarding is correct?Hazardous Materials Regulations
  11. 161.A driver is transporting a shipment of UN1002, Air, Compressed (Class 2.2), and UN1790, Hydrofluoric acid solution (Class 8, PG II). The shipping papers list both materials. Which of the following statements about the segregation of these materials is TRUE?Hazardous Materials Regulations
  12. 162.A driver is transporting a shipment of UN1814, Potassium hydroxide solution, Class 8, PG II, in an Intermediate Bulk Container (IBC). The IBC has a capacity of 500 gallons. What specific marking, besides the UN identification number and proper shipping name, is required on this IBC?Communication Rules
  13. 163.A driver is transporting a shipment of UN1075, Liquefied Petroleum Gas (LPG), a Class 2.1 (Flammable Gas), in a cargo tank. The driver needs to make an unscheduled stop for a short break. Which of the following parking locations is generally NOT permitted for this type of hazardous material?Hazardous Materials Regulations
  14. 164.A driver is transporting Division 1.3 (Explosives) materials. What is the maximum aggregate gross weight of Division 1.3 materials that can be transported on a single vehicle without special routing or permits?Loading and Unloading Hazardous Materials
  15. 165.A driver is transporting a shipment that includes UN1210, Printing ink (Class 3, PG II), and UN1791, Hypochlorite solution (Class 8, PG III). Which of the following statements regarding segregation is TRUE?Hazardous Materials Regulations
  16. 166.A driver is transporting a bulk quantity of UN1950, Aerosols, Class 2.1 (Flammable Gas), in a cargo tank. According to hazardous materials regulations, how must the driver ensure the cargo tank remains attended?Hazardous Materials Regulations
  17. 167.A driver is transporting a shipment of UN1950, Aerosols, Class 2.1, in non-bulk packages. Each package contains multiple aerosol cans. What specific marking is required on each individual non-bulk package, in addition to the hazard label?Communication Rules
  18. 168.A driver is transporting Division 6.1 (Poisonous) materials in packages. Under what circumstances, if any, is it permissible to transport these materials with foodstuffs?Loading and Unloading Hazardous Materials
  19. 169.A consignor is preparing to ship a hazardous material that is a liquid with a vapor pressure of 25 psia at 100°F (37.8°C). This material is being loaded into a cargo tank. According to hazardous materials regulations, what is the maximum allowable working pressure (MAWP) that the cargo tank must be designed to withstand, at a minimum, for this material?Bulk Tanks and Other Containers
  20. 170.A driver is transporting a shipment of UN1075, Liquefied Petroleum Gas (LPG), a Class 2.1 (Flammable Gas). The cargo tank is equipped with an emergency discharge control system. During an emergency, which of the following is NOT an acceptable method for the driver to activate the system?Hazardous Materials Regulations
  21. 171.A driver is transporting a shipment of UN1824, Sodium hydroxide solution, Class 8, PG II. The shipping papers provided by the shipper list the quantity as 1,000 pounds, but the driver's visual inspection confirms the total weight of the packages is 1,200 pounds. What is the driver's immediate responsibility regarding this discrepancy?Communication Rules
  22. 172.A driver is delivering a shipment of UN1203, Gasoline, Class 3, PG II, in 55-gallon drums. Upon arrival at the consignee's facility, the consignee refuses the shipment due to a damaged drum. What is the driver's responsibility regarding the shipping papers for the undelivered portion of the shipment?Communication Rules
  23. 173.A driver is transporting a shipment of UN1072, Oxygen, compressed, Class 2.2, in a cargo tank. The cargo tank has a capacity of 3,500 gallons. What placard is specifically required for this shipment?Communication Rules
  24. 174.A driver is loading packages of Class 4.2 (Spontaneously Combustible) materials onto a vehicle. Which of the following statements regarding segregation is correct?Loading and Unloading Hazardous Materials
  25. 175.A portable tank is designed for the transport of liquid hazardous materials. It has a test pressure of 6.0 bar. According to UN portable tank regulations, what is the maximum allowable working pressure (MAWP) for this tank?Bulk Tanks and Other Containers
  26. 176.A technician is loading a portable tank containing Class 8 (Corrosive) material onto a flatbed trailer. What is the minimum number of tiedowns required to secure a portable tank with a capacity of 1,500 gallons?Loading and Unloading Hazardous Materials
  27. 177.A cargo tank motor vehicle is transporting a hazardous material that requires placarding under Table 1 of the placarding tables. The cargo tank has a capacity of 10,000 gallons. How many placards must be displayed on the vehicle, at a minimum, for this shipment?Bulk Tanks and Other Containers
  28. 178.A driver is transporting a bulk quantity of UN1203, Gasoline (Class 3, PG II). The driver needs to leave the vehicle unattended for a short period. What is the maximum distance the driver can be from the vehicle for it to still be considered 'attended'?Hazardous Materials Regulations
  29. 179.A consignor is preparing to ship a hazardous material in a bulk packaging other than a cargo tank, portable tank, or IBC. The packaging has a maximum capacity of 500 liters. What type of bulk packaging is this most likely considered under hazardous materials regulations?Bulk Tanks and Other Containers
  30. 180.A driver is transporting a cargo tank containing Class 2.1 (Flammable Gas). Which of the following actions is PROHIBITED during the loading or unloading process?Loading and Unloading Hazardous Materials
  31. 181.A driver is transporting a shipment of UN1993, Flammable liquids, N.O.S., Class 3, PG III, in non-bulk packages. The packages are correctly marked with the UN number and proper shipping name. What additional marking is required on these non-bulk packages because it's an N.O.S. entry?Communication Rules
  32. 182.A driver is transporting a bulk quantity of UN1203, Gasoline (Class 3, PG II). The driver has parked the vehicle at a truck stop. Which of the following parking situations is generally permissible?Hazardous Materials Regulations
  33. 183.A carrier is preparing a shipment of Class 7 (Radioactive) materials that meets the definition of a Highway Route Controlled Quantity (HRCQ). Which of the following is a mandatory requirement for transporting this shipment?Loading and Unloading Hazardous Materials
  34. 184.When loading cylinders of compressed gas onto a vehicle, what is the correct orientation to prevent movement and potential damage during transport?Loading and Unloading Hazardous Materials
  35. 185.A driver is transporting a bulk quantity of a hazardous material in a cargo tank. The material is a liquid with a specific gravity of 1.25. The cargo tank has a maximum allowable working pressure (MAWP) of 25 psi and a test pressure of 37.5 psi. To determine the maximum permitted weight of the hazardous material, which of the following is the most critical piece of information to consider first?Bulk Tanks and Other Containers
  36. 186.A driver is preparing to transport a shipment of UN1017, Chlorine (Class 2.3, Poison Gas). Which of the following statements about the driver's specific requirements for transporting this material is TRUE?Hazardous Materials Regulations
  37. 187.A driver is transporting a shipment of UN1203, Gasoline (Class 3, PG II). The vehicle is involved in a minor accident that results in a small spill (less than 1 gallon) of gasoline, which is quickly contained. No injuries occurred, and there is no immediate danger to the public. What is the driver's primary responsibility regarding reporting this incident?Hazardous Materials Regulations
  38. 188.A driver is transporting a bulk quantity of a hazardous material that is a liquid with a flash point of 95°F (35°C). The material is in a cargo tank. Which of the following placarding categories applies to this material for bulk transport?Bulk Tanks and Other Containers
  39. 189.A cargo tank motor vehicle is transporting a liquid hazardous material. The tank is equipped with an internal self-closing stop valve. Federal regulations require a shear section to be incorporated into the valve design. What is the primary purpose of this shear section?Bulk Tanks and Other Containers
  40. 190.A driver is transporting 2,000 pounds of UN1830, Sulfuric acid, with more than 51% acid, Class 8, PG II, in non-bulk packages. The vehicle also contains 800 pounds of UN1789, Hydrochloric acid, Class 8, PG II, in non-bulk packages. What placarding is required for this vehicle?Communication Rules
  41. 191.A driver is transporting a mixed load of hazardous materials. The vehicle contains 300 pounds of UN1202, Diesel fuel, Class 3, PG III, and 750 pounds of UN1789, Hydrochloric acid, Class 8, PG II. What placarding is required for this vehicle?Communication Rules
  42. 192.A carrier is transporting a hazardous material in a portable tank that requires the display of a UN portable tank identification plate. Which of the following pieces of information is NOT typically found on this identification plate?Bulk Tanks and Other Containers
  43. 193.A driver is transporting a bulk quantity of Class 8 (Corrosive) material in a cargo tank. What is the MINIMUM distance a qualified person must remain from the cargo tank during the loading or unloading process to ensure attendance?Loading and Unloading Hazardous Materials
  44. 194.A driver is transporting a non-bulk shipment of UN1263, Paint (Class 3, PG II), weighing 800 pounds, and UN1830, Sulfuric acid (Class 8, PG II), weighing 300 pounds. Both materials are in separate packages. Which placards are required on the vehicle?Hazardous Materials Regulations
  45. 195.A portable tank is being used to transport a hazardous material. What is the minimum required number of permanent markings that must be displayed on the tank to ensure compliance with hazardous materials regulations, excluding placards and temporary hazard warnings?Bulk Tanks and Other Containers
  46. 196.A driver is transporting a bulk quantity of UN1789, Hydrochloric acid (Class 8, PG II). What specific placard is REQUIRED on the vehicle?Hazardous Materials Regulations
  47. 197.A driver is transporting a bulk quantity of Class 2.2 (Non-Flammable, Non-Poisonous Gas) in a cargo tank. Which of the following is a mandatory attendance requirement during the unloading process?Loading and Unloading Hazardous Materials
  48. 198.A consignor is preparing a bulk shipment of a liquid hazardous material with a specific gravity of 0.95. The cargo tank has a maximum rated capacity of 7,500 gallons. To prevent overfilling due to thermal expansion, regulations require that the tank not be filled to more than 95% of its capacity by volume. What is the maximum volume, in gallons, that can be loaded into this cargo tank?Bulk Tanks and Other Containers
  49. 199.A driver is preparing to load a cargo tank with a Class 3 (Flammable Liquid). According to regulations, what is the maximum permissible speed at which the liquid can flow into the tank during the initial filling stage?Loading and Unloading Hazardous Materials
  50. 200.A driver is transporting a portable tank containing UN1993, Flammable liquids, N.O.S., Class 3, PG II. The tank is not permanently attached to the vehicle. What additional marking is required on this portable tank, specifically because it's an N.O.S. (Not Otherwise Specified) entry?Communication Rules