AFF Exit Exam • Set 4 Question 25 of 30

Which of the listed classes of fires can best be extinguished with a water fog?

✓

Direct Answer

Option B: 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.

All Options

A

Class B and C

B

Class A and B (Correct Answer)

C

Class A and D

D

Class C and D

Detailed Explanation & Context

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.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).

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