Fire can be reduced by removing _______.

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ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper
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  1. Oxygen
  2. Heat
  3. Fuel
  4. Any of above

Answer (Detailed Solution Below)

Option 4 : Any of above
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Detailed Solution

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Explanation:

Fire:

  • Fire is the burning of combustible material.
  • A fire in an unwanted place and on an unwanted occasion and in uncontrollable quantity can cause damage or destroy property and materials.

The factors that control fire:

Fuel:

  • Any substance, liquid, solid, or gas will burn if given oxygen and a high enough temperature.

Heat:

  • Every fuel will begin to burn at a certain temperature.
  • Solids and liquids give off vapor when heated and it is this vapor which ignites.
  • Some liquids give off vapor even at normal room temperature say 15° C, e.g. petrol.

Oxygen:

  • Usually, it exists in sufficient quality in the air to keep a fire burning.

Extinguishing of fires:

Isolating or removing any of these factors from the combination will extinguish the fire. There are three basic ways of achieving this:

  1. Starving the fire of fuel by removing the fuel in the vicinity of the fire.
  2. Smothering, i.e. by isolating the fire from the supply of oxygen by blanketing it with foam, sand, etc.
  3. Cooling, i.e. by using water to lower the temperature, i.e. by removing heat.

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