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CDL Hazardous Materials Endorsement (HME) practice questions

200 free questions with answers and explanations.

Practice test
  1. 101.A driver is delivering a shipment of UN1203, Gasoline, Class 3, PG II, in 55-gallon drums. Upon arrival at the consignee's location, the driver discovers that the consignee is closed for the day and there is no secure place to leave the shipment. What is the driver's primary responsibility regarding the shipping papers in this situation?Communication Rules
  2. 102.A driver is transporting a portable tank containing UN1993, Flammable liquids, N.O.S., Class 3, PG III. The tank is being used for a material that is not specifically listed in the Hazardous Materials Table. What specific marking is required on the portable tank in addition to the identification number and appropriate placards?Communication Rules
  3. 103.A driver is transporting a shipment of UN1005, Anhydrous Ammonia, Class 2.2, with a subsidiary hazard of 6.1 (Poison Inhalation Hazard - PIH), in a bulk packaging. Which of the following markings is specifically required on the bulk packaging to indicate the PIH hazard?Communication Rules
  4. 104.A driver is transporting a shipment of UN1950, Aerosols, Class 2.1, in non-bulk packages. The packages are labeled with the 'FLAMMABLE GAS' label. Which of the following is NOT a required marking for each individual non-bulk package of this hazardous material?Communication Rules
  5. 105.A driver is transporting a shipment of UN1824, Sodium hydroxide solution, Class 8, PG II, in 55-gallon drums. The driver notices that the hazard labels on three drums are peeling off and are barely legible. What is the driver's immediate responsibility regarding this discrepancy?Communication Rules
  6. 106.A driver is unloading a cargo tank containing a Class 8 Corrosive material. What is the minimum length of time the driver must remain in attendance at the cargo tank?Loading and Unloading Hazardous Materials
  7. 107.A driver is transporting Class 3 Flammable Liquids in cargo tanks. Which of the following attendance requirements applies when the driver is not in the vehicle?Loading and Unloading Hazardous Materials
  8. 108.Which of the following classes of hazardous materials is NEVER permitted to be loaded into or on a portable tank?Loading and Unloading Hazardous Materials
  9. 109.A driver is preparing to load Division 1.1 explosives onto a vehicle. Which of the following is a critical precaution to take regarding the vehicle's engine and electrical system during the loading process?Loading and Unloading Hazardous Materials
  10. 110.A carrier is transporting hazardous materials that require placarding. Which of the following statements regarding placard placement is correct?Loading and Unloading Hazardous Materials
  11. 111.When loading or unloading a cargo tank containing hazardous materials, what is the minimum distance required for the driver or attendant to remain from the cargo tank?Loading and Unloading Hazardous Materials
  12. 112.When loading cylinders of compressed gas onto a vehicle, what is the correct orientation for the cylinders?Loading and Unloading Hazardous Materials
  13. 113.A driver is transporting a shipment that includes both Class 4.3 (Dangerous When Wet) materials and Class 2.1 (Flammable Gas) cylinders. Which of the following segregation requirements applies?Loading and Unloading Hazardous Materials
  14. 114.A technician is loading packages of Class 4.1 (Flammable Solids) and Class 5.1 (Oxidizers) onto the same transport vehicle. According to the segregation requirements, which of the following practices is allowed?Loading and Unloading Hazardous Materials
  15. 115.A portable tank containing a hazardous material is being loaded onto a flatbed trailer. What is the minimum number of tiedowns required to secure a portable tank with a capacity of 1,000 gallons?Loading and Unloading Hazardous Materials
  16. 116.A driver is transporting packages of Class 5.2 (Organic Peroxides) and Class 3 (Flammable Liquids) in the same vehicle. According to the segregation requirements of Table 177.848(e), what is the minimum segregation requirement between these two classes?Loading and Unloading Hazardous Materials
  17. 117.When loading a transport vehicle with packages of hazardous materials, what is the primary purpose of blocking and bracing?Loading and Unloading Hazardous Materials
  18. 118.A driver is transporting packages of Class 5.2 (Organic Peroxides) and Class 3 (Flammable Liquids). According to the segregation requirements, how must these materials be loaded?Loading and Unloading Hazardous Materials
  19. 119.A driver is preparing to load a cargo tank with a hazardous material that requires bonding and grounding. What is the primary purpose of connecting a bonding cable between the cargo tank and the facility's loading arm?Loading and Unloading Hazardous Materials
  20. 120.A driver is transporting a load that includes both Class 4.3 (Dangerous When Wet) materials and Class 2.1 (Flammable Gas) cylinders. Which of the following segregation requirements applies?Loading and Unloading Hazardous Materials
  21. 121.A driver is transporting hazardous materials in an enclosed van. To ensure proper ventilation, what must be done before entering the cargo area, especially after a prolonged stop?Loading and Unloading Hazardous Materials
  22. 122.A driver is transporting a portable tank containing a hazardous material. What is the minimum aggregate working load limit (WLL) for the tiedown assemblies used to secure this tank on a flatbed trailer?Loading and Unloading Hazardous Materials
  23. 123.A driver is transporting Division 2.1 (Flammable Gas) cylinders. Which of the following is an acceptable method for securing these cylinders in a vehicle?Loading and Unloading Hazardous Materials
  24. 124.A driver is transporting a load of hazardous materials that includes both Class 3 (Flammable Liquids) and Division 5.1 (Oxidizers). According to hazardous materials regulations, what is the minimum required segregation for these two classes if transported in the same vehicle?Loading and Unloading Hazardous Materials
  25. 125.A driver is transporting Division 2.3 (Poison Gas) in cylinders. Which of the following statements regarding the segregation of these cylinders from foodstuff is accurate?Loading and Unloading Hazardous Materials
  26. 126.A carrier is transporting hazardous materials that require placarding. Which of the following statements about the placement of placards is correct?Loading and Unloading Hazardous Materials
  27. 127.A technician is loading cylinders of Division 2.2 (Non-Flammable, Non-Poisonous Gas) onto a flatbed trailer. What is the minimum number of tiedowns required for a portable tank (not a cylinder) that is 10 feet long and weighs 6,000 lbs?Loading and Unloading Hazardous Materials
  28. 128.A driver is preparing to load a cargo tank with a Class 3 Flammable Liquid. According to regulations, what is the maximum speed at which the product can flow into the tank during the initial fill phase?Loading and Unloading Hazardous Materials
  29. 129.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 operation?Loading and Unloading Hazardous Materials
  30. 130.A driver is transporting Division 6.1 (Poisonous) materials in packages. Under what circumstances can these packages be loaded into the same transport vehicle with foodstuffs, feed, or edible materials?Loading and Unloading Hazardous Materials
  31. 131.A driver is transporting a bulk quantity of Class 8 (Corrosive) material in a cargo tank. Which of the following actions is prohibited during the loading or unloading process?Loading and Unloading Hazardous Materials
  32. 132.A facility is loading a cargo tank with a hazardous material. What is the primary purpose of bonding the cargo tank to the loading rack during the transfer operation?Loading and Unloading Hazardous Materials
  33. 133.A driver is transporting Division 1.4 (Explosives) materials. What is the maximum aggregate gross weight of Division 1.4 materials that can be transported in a single transport vehicle without requiring a special route or escort?Loading and Unloading Hazardous Materials
  34. 134.When loading or unloading hazardous materials, what is the primary purpose of ensuring that the vehicle is properly chocked or otherwise prevented from moving?Loading and Unloading Hazardous Materials
  35. 135.A driver is transporting a shipment of UN1950, Aerosols, Class 2.1 (Flammable Gas), in non-bulk packages. The total gross weight of the hazardous material is 1,200 pounds. Which of the following statements about placarding is true?Hazardous Materials Regulations
  36. 136.A driver is transporting a bulk quantity of UN1789, Hydrochloric acid, Class 8 (Corrosive), Packing Group II, in a cargo tank. The driver needs to determine the appropriate placard for the vehicle. Which of the following placards must be displayed?Hazardous Materials Regulations
  37. 137.A driver is transporting a shipment of UN1210, Printing ink, Class 3 (Flammable Liquid), Packing Group II, in a cargo tank. What is the driver's primary responsibility regarding the emergency discharge control system for this vehicle?Hazardous Materials Regulations
  38. 138.A driver is transporting a shipment of UN1005, Anhydrous Ammonia, Class 2.2 (Non-Flammable Gas) in a cargo tank. According to federal regulations, what is the maximum amount of time the driver can leave this cargo tank unattended without complying with specific parking attendance requirements?Hazardous Materials Regulations
  39. 139.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
  40. 140.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
  41. 141.A consignor is preparing to ship a hazardous material in a bulk packaging other than a cargo tank or portable tank. This packaging is designed to hold a maximum net mass of 1,500 kg (3,307 lbs). What type of bulk packaging is this most likely to be?Bulk Tanks and Other Containers
  42. 142.What is the maximum internal pressure that a DOT Specification 406 cargo tank is designed to withstand during normal operation?Bulk Tanks and Other Containers
  43. 143.A portable tank is designed to be lifted on and off a transport vehicle. What is the minimum number of lifting devices or attachments required for a portable tank carrying hazardous materials?Bulk Tanks and Other Containers
  44. 144.A driver is preparing to transport a hazardous material in a portable tank. The material is a liquid with a specific gravity of 1.2 and a maximum filling density of 90%. If the tank has a water capacity of 10,000 gallons, what is the maximum weight of this hazardous material that can be loaded?Bulk Tanks and Other Containers
  45. 145.A cargo tank motor vehicle is transporting a hazardous material that is a liquid. The tank is equipped with various valves and fittings. Which of the following is typically a required safety feature for cargo tanks carrying liquids that helps prevent accidental discharge in case of valve failure or external damage?Bulk Tanks and Other Containers
  46. 146.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
  47. 147.A bulk packaging containing a hazardous material must display proper placards. However, if the material is a Class 9 (Miscellaneous Hazardous Material) and is transported by highway or rail, what is the specific placarding requirement for this class?Bulk Tanks and Other Containers
  48. 148.A carrier is preparing to transport a bulk quantity of a hazardous material that is classified as a Division 2.2 (non-flammable, non-poisonous gas). What is the minimum aggregate gross weight of this material that would require the transport vehicle to be placarded?Bulk Tanks and Other Containers
  49. 149.A driver is transporting a bulk quantity of a hazardous material that is a liquid. The material has a specific gravity of 1.2 and a maximum filling density of 90%. The tank has a water capacity of 10,000 gallons. What is the maximum permitted weight of this hazardous material that can be loaded into the tank?Bulk Tanks and Other Containers
  50. 150.A cargo tank motor vehicle is transporting a non-pressure liquid hazardous material. What specific DOT specification marking would indicate that this cargo tank is designed for such materials and has a maximum allowable working pressure (MAWP) of at least 25 psig but not more than 40 psig?Bulk Tanks and Other Containers