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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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How is a form made in a form type fire extinguisher?
Soda-acid type
Sodium bicarbonate and aluminum sulfate type
Chemical powders and water types
Any given
Any given
Quick Summary: Foam-type fire extinguishers generate a blanketing foam to extinguish fires by separating the fuel from oxygen. The foam is produced by the chemical reaction between an acid solution and a base solution, or via mechanical aeration of a foaming agent.
Foam-type fire extinguishers generate a blanketing foam to extinguish fires by separating the fuel from oxygen. The foam is produced by the chemical reaction between an acid solution and a base solution, or via mechanical aeration of a foaming agent.
2Al2(SO4)3+6NaHCO3→2Al(OH)3+3Na2SO4+6CO2 — Chemical reaction generating CO2 gas for foam propulsion and structure.
The principle relies on the generation of a thick layer of fire-fighting foam that floats on the surface of burning liquid fuels. This foam blanket acts as a barrier, effectively smothering the fire by cutting off the oxygen supply and cooling the fuel surface.
Foam extinguishers are primarily used for Class B (flammable liquid) fires.
The foam creates an airtight seal over the fuel surface.
Chemical foam types use separate tanks for acid and base which mix upon inversion.
Mechanical foam types use a concentrated liquid agent mixed with air and water.
Effective at preventing re-ignition by sealing the surface
Minimal risk of splashing fuel compared to water jet
Conductive, should not be used on energized electrical equipment
Limited effectiveness on three-dimensional fires
Oil refineries
Paint storage facilities
Aircraft hangars
The term 'form' in the original question is a typographical error for 'foam'.
Option D is labeled 'Any given' because different chemical and mechanical combinations can be used to produce the foam structure.
D is correct — Foam-type extinguishers can be manufactured using various chemical compositions or mechanical aeration techniques to produce fire-suppressing foam.
Always remember that foam extinguishers are electrically conductive and pose a severe shock hazard if used on live electrical systems.