G2 Gas Fitter Practice Exam

Select the type of fire extinguisher used to fight fires involving certain combustible metals.

1. Type A

2. Type B

3. Type C

4. Type D

The correct answer is: Type D

The correct choice for fighting fires involving certain combustible metals is indeed Type D. Type D fire extinguishers are specifically designed for fires that involve combustible metals such as magnesium, titanium, aluminum, and sodium. These metals can ignite and burn at very high temperatures, and traditional extinguishers may not effectively suppress these types of flames. Instead, Type D extinguishers typically use dry powder agents that smother the fire and prevent oxygen from reaching the burning metal, thereby allowing for safer and more effective firefighting. In contrast, other types of extinguishers are designed for different classes of fires. Type A extinguishers are intended for ordinary combustible materials such as wood and paper, Type B extinguishers are designed for flammable liquids like grease and oil, and Type C extinguishers are meant for electrical fires. Using the wrong type of extinguisher on a combustible metal fire can not only be ineffective but could potentially worsen the situation. Thus, it's crucial to choose the appropriate extinguisher for the specific type of fire hazard at hand.