CVOR Dangerous Goods Transportation 2 — Questions and Answers
Question 1: DOT Class 3 hazardous materials are classified as:
- Explosives
- Flammable liquids (Correct answer)
- Corrosive substances
- Toxic gases
Correct answer: Flammable liquids
Class 3 covers flammable liquids, including gasoline, diesel fuel, and acetone, which have a flash point below 60°C (140°F).
Question 2: What is the UN number displayed on hazardous materials labels and placards?
- A carrier-assigned tracking number
- A United Nations four-digit identification number for the specific hazardous substance (Correct answer)
- A universal notice code for border crossings
- A unique notification number assigned by the shipper
Correct answer: A United Nations four-digit identification number for the specific hazardous substance
UN numbers are internationally recognized four-digit codes assigned by the United Nations to identify specific hazardous substances or article groups.
Question 3: Radioactive materials are classified under which DOT hazard class?
- Class 5
- Class 6
- Class 7 (Correct answer)
- Class 8
Correct answer: Class 7
Class 7 specifically covers radioactive materials, requiring special handling, shielding, and transport index labeling.
Question 4: Which of the following is NOT a required element on a hazardous materials shipping paper?
- Proper shipping name
- Hazard class or division
- UN/NA identification number
- Driver's commercial license number (Correct answer)
Correct answer: Driver's commercial license number
Shipping papers must include the proper shipping name, hazard class, UN/NA number, packing group, and quantity — the driver's license number is not required.
Question 5: When transporting flammable liquids (Class 3), which is the most critical safety precaution?
- Transport only during daylight hours
- Ensure proper cargo ventilation and keep the load away from all ignition sources (Correct answer)
- Limit transport to interstate highways only
- Keep cargo temperature above 50°F at all times
Correct answer: Ensure proper cargo ventilation and keep the load away from all ignition sources
Flammable liquids emit vapors that can ignite; eliminating ignition sources and ensuring ventilation prevents fire and explosion.
Question 6: Which packing group designation indicates the HIGHEST level of danger for a hazardous material?
- Packing Group III
- Packing Group II
- Packing Group I (Correct answer)
- All packing groups represent equal danger
Correct answer: Packing Group I
Packing Group I indicates great danger and requires the most protective packaging, while PG II is medium danger and PG III is minor danger.
Question 7: What is the Emergency Response Guidebook (ERG) and who primarily uses it?
- A carrier registration manual used by motor vehicle departments
- A reference guide used by first responders to safely handle hazmat emergencies (Correct answer)
- An internal safety manual provided by the shipping company to the driver
- A federal inspection checklist used during roadside audits
Correct answer: A reference guide used by first responders to safely handle hazmat emergencies
The ERG, published by PHMSA, gives first responders initial guidance on protecting themselves and the public during the first 30 minutes of a hazmat incident.
CVOR Dangerous Goods Transportation 2
DOT Class 3 hazardous materials are classified as: