NEBOSH Practice Test

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Prepare for the NEBOSH exam. Use multiple choice questions and detailed explanations to improve your knowledge. Practice makes perfect!

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Which of the following is a suitable type of portable extinguisher for flammable liquids?

Water
Dry Powder
Class D
Foam

The correct answer is: Foam

The most suitable type of portable extinguisher for flammable liquids is foam. Foam extinguishers work by coating the burning liquid with a layer of foam, effectively cutting off the oxygen supply and preventing re-ignition. This is particularly effective for flammable liquids, as it can spread across the surface of the liquid, creating a barrier that helps to suppress the fire. In contrast, water extinguishers are not suitable for flammable liquids. When water is applied to these types of fires, it can cause the flammable liquid to spread, exacerbating the situation. Dry powder extinguishers can work on a variety of fires, including flammable liquids, but they may not be as effective in preventing re-ignition or providing a cooling effect. Class D extinguishers are specifically designed for combustible metals and would not be applicable in the case of flammable liquids. Therefore, foam is the most appropriate choice for effectively combating fires involving flammable liquids.