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Steam Boiler Quiz 2 ProProfs Quiz. Steam Boiler Quiz 2 . Steam Boiler Quiz 2 . 48 Questions By Armymom Relieving normal water pressure. 47. A fire caused by oil, gas, grease, or paint is a Class _____ Fire. will lock the boiler out on safetyinterlock? Discuss. A. Safety Valve, Low Water Fuel Cutoff, and Flame Scanner.