Colorado CDL Practice Test

Which type of extinguisher is commonly used for class-O fires?

1. Multipurpose dry chemical, water, water w/antifreeze

2. Regular dry chemical, multipurpose dry chemical, halogenated agent

3. Purple K dry chemical, dry powder special compound

4. Regular dry chemical, KCL dry chemical, foam

The correct answer is: Multipurpose dry chemical, water, water w/antifreeze

The correct answer highlights the use of extinguishers that are effective in combating class K fires, which involve cooking oils and fats. While the question aims to clarify the appropriate extinguishing agents for class K fires, the mentioned options pertain to different types of fire classes. A multipurpose dry chemical extinguisher is a suitable choice as it can effectively disrupt the combustion process in various types of fires, including those involving cooking oils. Water extinguishers, on the other hand, can be useful but must be approached with caution, as using water on some types of cooking oil fires can result in spreading the flames. Using water with antifreeze is also helpful in preventing freezing, but primarily this mixture is not meant for class K fires specifically. Therefore, this answer emphasizes the breadth of fire extinguishing capabilities of certain extinguishers and their relevance in dealing with specific fire scenarios like those involving cooking oils.