Texas CDL General Knowledge Practice Exam

Which fire emergency situation justifies using water on fires?

1. Electrical fires

2. Brake fires

3. Engine fires

4. Tire fires

The correct answer is: Tire fires

Using water on tire fires can be justified under certain circumstances because water can help cool the rim and reduce the spread of flames. However, it is generally not the recommended practice because the fire might be fueled by materials other than the tire itself, and water may not effectively extinguish the fire. Electrical fires, brake fires, and engine fires present unique risks that make using water unsafe. Electrical fires can cause severe hazards since water conducts electricity, potentially leading to electrocution. Brake fires, often due to overheating from friction, may release flammable materials, so using water can exacerbate the situation. Engine fires can involve flammable fluids and materials that water cannot effectively extinguish, making special fire extinguishing agents more suitable for these types of fires. In summary, while there may be instances where water can be utilized on tire fires, caution must be exercised, and it is essential to recognize the specific nature of each fire type and the appropriate response necessary for safety.