OSH Security Practice Test

A Class “B” fire involves

1. Vegetable oils or fats

2. Ordinary combustible materials

3. Electrical equipment

4. Flammable liquids

The correct answer is: Flammable liquids

A Class “B” fire is characterized by the involvement of flammable liquids, such as gasoline, oil, paint, and various solvents. These materials are capable of producing volatile vapors that can ignite easily, resulting in fires that can spread quickly if not controlled effectively. Understanding the classification of fires helps in selecting the appropriate fire extinguishing methods and equipment. For instance, Class “B” fires require specific types of fire extinguishers, such as foam or dry chemical extinguishers, which are designed to suffocate the flames by cutting off the oxygen supply and preventing the vapors from igniting. The other options represent different classes of fires: vegetable oils or fats pertain to Class “K” fires, which are common in kitchens; ordinary combustible materials like wood, paper, and cloth are classified as Class “A” fires; and electrical equipment would fall under Class “C” fire scenarios, where treating them requires special precautions to avoid electrocution risks. Identifying the correct fire class is crucial for effective fire safety and response strategies.