Question The power unit of a placarded vehicle must carry a fire extinguisher with a minimum rating of: Answers 10 B:C. 30 B:C. 40 B:C. Explanation The power unit of a placarded vehicle must be equipped with a fire extinguisher with an Underwriters Laboratories (UL) rating of 10 B:C or more. Take a FREE Practice Test Now This questions appears in the following tests: California HazMat , Hawaii HazMat , Iowa HazMat , Kentucky HazMat , Michigan HazMat , Missouri HazMat , Ohio HazMat , Oklahoma HazMat , South Carolina HazMat , Virginia HazMat , Washington HazMat ,