A type B fire extinguisher is specifically used for which of the following?

A type B fire extinguisher is specifically designed for use on fires that involve flammable liquids such as gasoline, oil, grease, and other similar substances. The extinguishing agent in type B fire extinguishers works by creating a barrier between the fuel and the oxygen, thus suffocating the fire and preventing it from reigniting.

Fires involving electrical equipment or combustible materials require different types of extinguishing agents. Electrical fires generally require extinguishers rated for electrical hazards (often a type C extinguisher) because using a type B extinguisher could potentially exacerbate the situation or pose an electrical hazard. Similarly, combustible materials like wood or paper may be more effectively handled with a type A fire extinguisher, which is designed to handle ordinary combustibles.

Therefore, while flammable liquids are the primary focus for type B extinguishers, other types exist to handle different fire scenarios, reinforcing that type B extinguishers are not appropriate for all fire types listed in the question.