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CDL hazardous materials practice test 6

25 more questions on hazardous materials, written from the Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0).

25 questions

  1. Question 1How should hazardous materials shipping papers be kept when you also carry papers for other freight?

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    A: Tabbed or kept on top of the other papers. Hazmat shipping papers must be clearly distinguished, either tabbed or kept on top of the stack, so others can find them quickly after a crash. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.10 Where to Keep Shipping Papers and Emergency Response Information, page 9-15.

  2. Question 2Under the manual's Placard Table 2, which material needs no placard at all?

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    C: Division 6.2, Infectious Substances. Placard Table 2 lists '(None)' as the placard for Division 6.2 infectious substances; the others have their own placards. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables (Figure 9.8), page 9-9.

  3. Question 3Which of these is required of the person watching a cargo tank during loading or unloading?

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    D: They must be authorized and able to move the cargo tank. The attendant must be alert, have a clear view, be within 25 feet, know the hazards and emergency procedures, and be authorized and able to move the cargo tank. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.2 Tank Loading, page 9-13.

  4. Question 4Where must the emergency response information for a hazmat load be kept?

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    B: In the same place as the shipping paper. Keep the emergency response information together with the shipping paper, so responders find both in one place. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.10 Where to Keep Shipping Papers and Emergency Response Information, page 9-15.

  5. Question 5Is a Class 9 placard required for domestic transportation?

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    D: No, it is not required for domestic transportation. A footnote to Placard Table 2 states that the Class 9 placard is not required for domestic transportation. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables (Figure 9.8), page 9-9.

  6. Question 6You have a small amount of hazardous material left in a cargo tank and need to move it a short distance. What must you do first?

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    A: Close all manholes and valves. Every manhole and valve must be shut before a hazmat tank moves, even with only a little product left and even for a short move. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.2 Tank Loading, page 9-13.

  7. Question 7What is a hazardous materials identification number?

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    D: A four-digit code first responders use to identify the material. An ID number is a four-digit code that firefighters and other responders use to identify the material. The same number can apply to more than one chemical. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

  8. Question 8Where must the hazard class or division number appear on a placard used for a primary or subsidiary hazard?

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    A: In the lower corner. Placards for the primary or subsidiary hazard class must show the class or division number in the lower corner (49 CFR 172.519(b)(4)). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables, page 9-10.

  9. Question 9When loading or unloading flammable liquids, when may the engine be running?

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    C: Only if it is needed to operate a pump. Turn off your engine before loading or unloading flammable liquids; only run it if needed to operate a pump (49 CFR 177.837(a)). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.3 Flammable Liquids, page 9-13.

  10. Question 10Which letters may come before a hazardous materials identification number?

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    A: UN, NA or ID. Identification numbers are preceded by UN, NA or ID (Column 4 of the Hazardous Materials Table). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products (Column 4 of the Hazardous Materials Table), page 9-5.

  11. Question 11May you display placards for hazardous materials when they are not required?

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    B: Yes, as long as the placard identifies the hazard of the material being carried. Placards are allowed even when not required, as long as they correctly show the hazard of what you are carrying. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables, page 9-10.

  12. Question 12When filling a cargo tank through an open filling hole, when should the tank be grounded?

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    D: Before opening the filling hole, keeping the ground until after the hole is closed. Connect the ground before you open the filling hole and leave it connected until the hole is closed again (49 CFR 177.837(c)). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.3 Flammable Liquids, page 9-13.

  13. Question 13Which publication lists chemicals and the identification numbers assigned to them for use by emergency responders?

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    B: The Emergency Response Guidebook (ERG). The U.S. DOT's Emergency Response Guidebook lists chemicals and their identification numbers; it is indexed by proper shipping name and ID number. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

  14. Question 14What is bulk packaging, as the manual defines it for placarding?

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    C: A single container with a capacity greater than 119 gallons. For placarding, bulk packaging means one container that holds more than 119 gallons. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables, page 9-10.

  15. Question 15When should the liquid discharge valves on a compressed gas tank be open?

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    A: Only when loading and unloading. The liquid discharge valves on a compressed gas tank stay closed except during loading and unloading. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.4 Compressed Gas, page 9-13.

  16. Question 16Before transporting a material, which three lists should you check for its name?

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    C: The Hazardous Materials Table, the List of Hazardous Substances and Reportable Quantities, and the List of Marine Pollutants. Always check Section 172.101 (the Hazardous Materials Table), Appendix A (Hazardous Substances and Reportable Quantities) and Appendix B (Marine Pollutants). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

  17. Question 17A cargo tank has been unloaded but still holds the residue of a hazardous material. Must it stay placarded?

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    D: Yes, a bulk package must be placarded even if it only has residue. A bulk package, and a vehicle carrying one, must be placarded even if it only holds the residue of a hazardous material (49 CFR 172.514(b)). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.11 Placard Tables, page 9-10.

  18. Question 18Your engine runs the pump used to deliver compressed gas. When should you turn off the engine?

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    B: After product transfer, before unhooking the hose. If you use the engine for the pump, turn it off after product transfer, before you unhook the hose. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.4 Compressed Gas, page 9-13.

  19. Question 19In Column 1 of the Hazardous Materials Table, what does the symbol 'G' mean?

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    D: The shipping name is generic and must be followed by a technical name on the shipping paper. G marks a generic shipping name; it must be accompanied on the shipping paper by a technical name, the specific chemical that makes the product hazardous. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

  20. Question 20On an orange panel, how tall must the identification number be?

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    C: 100 mm (3.9 inches). The manual calls for black 100 mm (3.9 in) ID numbers. For an orange panel, 49 CFR 172.332(b)(1) sets the same 100 mm numeral height. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.1 Markings, page 9-12.

  21. Question 21What must you do before coupling, uncoupling or moving a cargo tank used for compressed gas?

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    C: Unhook all loading and unloading connections. Disconnect all loading and unloading hoses and lines before you couple, uncouple or move the cargo tank. Chock trailers whenever they are uncoupled. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.4 Compressed Gas, page 9-13.

  22. Question 22In Column 1 of the Hazardous Materials Table, what does the symbol 'A' mean?

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    A: The material is subject to the HMR only when shipped by air, unless it is a hazardous substance or hazardous waste. An 'A' in Column 1 means the HMR cover the material only when it is shipped by air, unless it is also a hazardous substance or a hazardous waste. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

  23. Question 23What must specification cargo tanks show in addition to the ID number?

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    D: Re-test date markings. Specification cargo tanks must show re-test date markings. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.1 Markings, page 9-12.

  24. Question 24How close to a placarded cargo tank used for Class 3 flammable liquids may anyone smoke?

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    B: Not within 25 feet. No smoking within 25 feet of a placarded Class 3 or Division 2.1 cargo tank, or of any vehicle carrying Class 1, 3, 4.1, 4.2 or 5 materials (49 CFR 397.13). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.6 No Smoking, page 9-14.

  25. Question 25In Column 1 of the Hazardous Materials Table, what does the symbol 'D' mean?

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    B: The proper shipping name is appropriate for domestic transportation but may not be for international transportation. 'D' means the proper shipping name works for shipments inside the U.S. but may not be right for international ones; 'I' marks a name used for international shipments. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.3.3 Lists of Regulated Products, page 9-4.

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Our own questions, written from the Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0), official manual, and checked against it.