Salvage and Overhaul No. 3 Questions taken from Jones & Bartlett Fundamentals of Fire Fighter Skills (3rd Edition) Progress Indicator: Question 2 of 15 2.  Where welding or cutting is being done, there shall be on hand __________________. Choices: A portable fire extinguisher or 240 lbs. of rock dust 2 portable fire extinguishers 2 portable fire extinguishers and 240 lbs. of rock dust 240 lbs. of rock dust