S96 Practice Test

Class D fires involve combustible metals and require special dry powder extinguishing agents specifically designed for the metal involved. Multi-purpose dry chemical extinguishers are not suitable for Class D fires and can potentially worsen the situation.

UL (Underwriters Laboratories) and FM (Factory Mutual) markings on fire extinguishers indicate that the extinguisher has been tested and certified to meet specific safety and performance standards set by these organizations.

Not all types of extinguishers can be recharged on-site. Some, like stored pressure dry chemical extinguishers, typically require specialized equipment and must be recharged at a fire equipment company's facility.

The C-rate is a measure of the rate at which a battery is charged or discharged relative to its maximum capacity. Understanding and adhering to appropriate C-rates is crucial for safe battery operation and longevity.

Halon fire extinguishers are prohibited in new installations primarily because Halon is a potent ozone-depleting substance. Its production was banned under the Montreal Protocol due to its harmful environmental effects.

Weighing the extinguisher is not typically part of a monthly inspection. It's usually done during annual maintenance. Monthly inspections focus on visual checks such as proper location, gauge reading, and intact seals.

UL 300 systems are designed to handle higher temperature cooking oils used in modern kitchens. They use a wet chemical agent that forms a foam blanket to suppress vapors and cool the burning oil, making them more effective than standard dry chemical systems for kitchen fires.

Discharging a fire extinguisher completely and disposing of it in regular trash is not correct. Fire extinguishers contain pressurized contents and potentially harmful chemicals, requiring proper disposal methods such as returning to the manufacturer or disposal through licensed waste management companies.

A Battery Management System (BMS) is crucial for lithium-ion battery safety as it monitors and controls the battery's charging and discharging processes, preventing overcharging, over-discharging, and other potentially dangerous conditions.

For ordinary (moderate) hazard occupancies, the minimum required rating for portable fire extinguishers is 2-A:10-B:C. This rating ensures adequate fire-fighting capability for typical moderate hazard environments.

Changing the extinguishing agent is strictly prohibited as it alters the fundamental nature and effectiveness of the extinguisher. Other modifications may be allowed if performed by qualified personnel and in compliance with regulations.

For extra (high) hazard occupancies, the maximum travel distance to a portable fire extinguisher is 30 feet. This shorter distance ensures quick access to extinguishers in high-risk areas.

Wet Chemical extinguishers are specifically designed for Class K fires, which involve cooking oils and fats in commercial kitchens. They create a foam blanket that suppresses vapors and cools the burning oil.

Thermal runaway in lithium-ion batteries is a dangerous condition where an increase in temperature causes a further increase in temperature, leading to a rapid, uncontrollable rise that can result in fire or explosion.

Hydrostatic testing intervals vary depending on the type of extinguisher. For example, stored pressure water and foam extinguishers require testing every 5 years, while carbon dioxide extinguishers require testing every 10 years.