Utah CDL General Knowledge Practice Test

The correct choice regarding which type of fire can be extinguished with water is tire fires. Tire fires generally involve burning materials that may not react explosively with water, depending on their environmental conditions and the amount of exposure involved. Water can help cool down the burning materials and suppress the flame by cutting off the fire's oxygen supply.

In contrast, electrical fires can pose significant dangers when extinguished with water due to the risk of electrocution, as water conducts electricity. Fuel fires, which involve flammable liquids, can cause the fire to spread or even explode when water is poured on them, as water can cause the fuel to splatter or evaporate, potentially leading to flare-ups. Car fires can encompass both electrical and fuel-related fires; therefore, water is often not a safe or effective extinguishing agent in these situations. Understanding the nature of the materials involved in each type of fire is crucial for selecting the appropriate extinguishing method, which highlights why identifying tire fires as the correct answer is important.