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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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Fire extinguishers with carbon tetra chloride are used to extinguish which type of fire?
Oil Fire
Electric fire
Gas Fire
Paper Fire
Electric fire
Quick Summary: Carbon Tetrachloride ($CCl_4$) fire extinguishers are primarily used for Class C fires, which involve live electrical equipment. They function as non-conductive extinguishing agents, preventing short circuits and electrical shock to the operator.
Carbon Tetrachloride (CCl4) fire extinguishers are primarily used for Class C fires, which involve live electrical equipment. They function as non-conductive extinguishing agents, preventing short circuits and electrical shock to the operator.
CCl4+Heat→Vaporized Gas — Phase change principle for smothering
Pextinguish=Vgas1 — Relationship showing how gas displacement reduces effective oxygen concentration
When CCl4 is applied to a fire, it vaporizes rapidly to form a heavy, non-combustible, and non-conductive gas blanket. This gas effectively displaces the oxygen surrounding the fuel, thereby suppressing combustion through the principle of smothering.
Carbon Tetrachloride is highly non-conductive, making it safe for electrical fires.
It is also known as a Vaporizing Liquid type extinguisher.
Modern use is limited due to the toxic nature of its decomposition products, such as phosgene gas (COCl2).
It is effective for localized fires where the area can be ventilated.
Non-conductive, safe for high-voltage equipment
Leaves no residue after evaporation
Highly effective at smothering fires in confined spaces
Toxic fumes can be produced upon heating
Ozone-depleting properties lead to restricted usage
Requires proper ventilation to avoid operator inhalation
Electrical panels and control systems
Computer server rooms
High-voltage laboratory equipment
Carbon Tetrachloride is chemically represented as CCl4.
Option A (Oil Fire) is better handled by Foam or Dry Chemical Powder (DCP).
Option D (Paper Fire) is primarily handled by Water-based extinguishers (Class A).
Note: Due to health risks, Carbon Tetrachloride is increasingly replaced by safer alternatives like CO2 or FM-200.
B is correct — Carbon tetrachloride is a non-conductive extinguishing agent specifically suited for suppressing fires in live electrical equipment.
Always remember the classification of fires: Class A (solids), Class B (liquids), Class C (gases), and Class E (electrical). CCl4 is primarily effective for Class E and restricted Class B.