Question 23 of 30
Which of the listed classes of fires can best be extinguished with a water fog?
A
Class A and B
B
Class B and C
C
Class C and D
D
Class A and D
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Answer & Explanation
The correct answer is Option A: Class A and B.
Water fog is particularly effective for Class A fires (ordinary combustibles like wood, paper, cloth) by cooling and penetrating the material, and for Class B fires (flammable liquids) by cooling the liquid surface to below its flashpoint and forming a barrier. It is not suitable for Class C (electrical) or Class D (combustible metals) fires.