Proper maintenance of a dry chemical fire...

🔍 Key Concepts

• Dry chemical fire extinguisher construction and operation (powder charge plus separate CO₂ cartridge or stored pressure) • Effect of moisture on dry chemical powder (caking, clumping, loss of discharge effectiveness) • Proper routine maintenance actions vs. actions that permanently disable the extinguisher

💭 Think About

• Which option actually helps keep the dry chemical powder free‑flowing and ready to discharge properly? • Which options would obviously damage or disable the extinguisher or change how it is designed to operate? • Think about what trained crew are told to do during monthly extinguisher checks—what simple action is sometimes recommended with dry chemical units?

✅ Before You Answer

• Eliminate any choice that adds moisture to the agent in a "dry" extinguisher. • Eliminate any choice that modifies or damages the CO₂ cartridge before the extinguisher is needed in an emergency. • Focus on the option that maintains the powder’s ability to flow without altering the extinguisher’s basic design or readiness.

Proper maintenance of a dry chemical fire extinguisher will include __________.

adding water to the powder

painting the CO₂ cartridge red

puncturing the CO₂ cartridge

shaking the extinguisher to loosen the caked-up portions of the powder

🔍 Key Concepts

💭 Think About

✅ Before You Answer