🔍 Key Concepts

• Class B (flammable liquid) fires and why foam is preferred over plain water for oil at a bunker station • How this specific appliance works: note the suction hose leading to a foam concentrate container and the long tube with an applicator at the end • Foam application techniques: difference between banking/bouncing foam off a surface vs. plunging a straight stream into the burning liquid

💭 Think About

• From the illustration, does this device appear to pick up foam concentrate from a separate container, or is it just a plain water nozzle? What does that imply about what it should discharge? • For an oil fire, would you want to drive a straight, forceful stream directly into the burning fuel, or lay a gentle blanket over the surface so you don’t agitate and spread the fire? • Looking at the answer choices, which options both (1) use the correct extinguishing agent for oil and (2) apply it in the way that forms and maintains a stable blanket on the fuel surface?

✅ Before You Answer

• Confirm this is a foam applicator by identifying the pickup hose going into a drum of foam concentrate in the figure. • Eliminate any choice that uses plain water as the primary extinguishing agent on a pool of oil. • Among the foam choices, prefer the method that minimizes agitation of the fuel surface and builds a foam blanket across it.