Question

If a vehicle using ethanol or methanol is on fire, use only to extinguish.

A. water
B. Class D fire extinguishers
C. aqueous film forming foam
D. Alcohol Resistant Class B foam

Answer 1

To extinguish a vehicle fire involving ethanol or methanol, use Alcohol Resistant Class B foam. So, the correct answer is option D.

Step-by-step explanation:

If a vehicle using ethanol or methanol is on fire, use only Alcohol Resistant Class B foam to extinguish. This type of foam is specifically designed to combat fires involving flammable liquids such as ethanol and methanol. It forms a protective layer on the burning surface, preventing re-ignition and suppressing the flames.

Other extinguishing agents like water, Class D fire extinguishers, and aqueous film forming foam may not be effective against ethanol and methanol fires. So, the correct answer is option D.

Answer 2

To extinguish a fire from a vehicle using ethanol or methanol, Alcohol Resistant Class B foam is recommended due to its ability to spread over and smother the fire. Option D is correct.

Step-by-step explanation:

If a vehicle using ethanol or methanol is on fire, the recommended extinguishing medium is Alcohol Resistant Class B foam. This is because the fluorinated solution within these foams can spread across the surface of alcohol fires, forming an aqueous film that suffocates the fire by cutting off the oxygen supply and prevents re-ignition by creating a barrier between the fuel and the air.

Other agents like water might not be effective as alcohols can mix with water, reducing its ability to extinguish the fire, while Class D fire extinguishers are not suitable for flammable liquids but are designed for combustible metals. Aqueous Film Forming Foam (AFFF) could be used; however, alcohol-resistant foams are more effective for alcohol-based fires as they are specifically formulated to form a protective layer over the burning alcohol.