Question 65

The Correct Answer is C **Why option C ("Pull pin, squeeze grip.") is correct:** Operating a portable fire extinguisher, regardless of the agent (like CO2), generally follows the P.A.S.S. acronym: * **P**ull the pin: This breaks the tamper seal and allows the handle mechanism to be operated. * **A**im the nozzle (or horn, in the case of CO2) at the base of the fire. * **S**queeze the handle (or grip): This discharges the extinguishing agent. * **S**weep the nozzle from side to side. Therefore, pulling the safety pin and squeezing the operating grip are the necessary physical steps to activate and discharge the CO2 extinguisher. **Why the other options are incorrect:** * **A) Break the rupture disc:** The rupture disc is a safety feature designed to prevent catastrophic failure if the cylinder is over-pressurized (e.g., exposed to extreme heat). It is not part of the standard operational procedure for discharging the extinguisher. * **B) Turn cylinder upside-down:** Fire extinguishers are designed to operate upright. Turning the cylinder upside-down may impede the discharge mechanism or change the pressure dynamics, often resulting in poor or failed discharge. * **D) Point the horn down:** While the horn (the discharge nozzle) must be pointed toward the fire, the instruction to "point the horn down" is too vague and does not describe the necessary *operation* or activation steps. Furthermore, aiming it downward without specifying the target (the base of the fire) is incomplete instruction.