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Questions and Answers
Which method is appropriate for extinguishing a Class B fire?
Which method is appropriate for extinguishing a Class B fire?
What type of fire extinguisher should be used for Class F fires?
What type of fire extinguisher should be used for Class F fires?
Which of the following is NOT a product of combustion?
Which of the following is NOT a product of combustion?
What is a primary cause of injuries or deaths in fire incidents?
What is a primary cause of injuries or deaths in fire incidents?
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Which type of explosion is characterized by a violent oxidation reaction?
Which type of explosion is characterized by a violent oxidation reaction?
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At what temperature does steel begin to lose its strength?
At what temperature does steel begin to lose its strength?
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What type of explosion involves the rapid combustion of flammable gases or vapors?
What type of explosion involves the rapid combustion of flammable gases or vapors?
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What was identified as the cause of the initial blast in the Stars Engrg case?
What was identified as the cause of the initial blast in the Stars Engrg case?
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In the Tuas explosion case study, how many people were killed as a result of the incident?
In the Tuas explosion case study, how many people were killed as a result of the incident?
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What is the main action to take when faced with a Class C fire?
What is the main action to take when faced with a Class C fire?
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In the classification of hazardous areas, which zone is characterized by an area where flammable vapors are present continuously or for long periods?
In the classification of hazardous areas, which zone is characterized by an area where flammable vapors are present continuously or for long periods?
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Which method can help prevent the formation of an explosive atmosphere in the workplace?
Which method can help prevent the formation of an explosive atmosphere in the workplace?
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What ignited the potato starch powder in the Stars Engrg explosion?
What ignited the potato starch powder in the Stars Engrg explosion?
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What immediate action was taken after the explosion at the Audi service centre?
What immediate action was taken after the explosion at the Audi service centre?
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Which type of explosion involves the rapid release of energy from a chemical reaction and is characterized by shock waves?
Which type of explosion involves the rapid release of energy from a chemical reaction and is characterized by shock waves?
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What safety measure is essential for reducing ignition probability in hazardous areas?
What safety measure is essential for reducing ignition probability in hazardous areas?
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Which of the following is NOT one of the components of the fire triangle?
Which of the following is NOT one of the components of the fire triangle?
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What is the primary method used to extinguish a fire by removing heat?
What is the primary method used to extinguish a fire by removing heat?
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Which of the following can be a product of combustion?
Which of the following can be a product of combustion?
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Which class of fire involves flammable liquids?
Which class of fire involves flammable liquids?
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What distinguishes ignition from combustion?
What distinguishes ignition from combustion?
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Which of the following best describes an explosion?
Which of the following best describes an explosion?
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Industrial explosions are often caused by which of the following?
Industrial explosions are often caused by which of the following?
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Which materials can burn when sufficient heat is applied?
Which materials can burn when sufficient heat is applied?
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Study Notes
Fire Chemistry
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Fire is a chemical reaction caused by fuel, oxygen, and heat.
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Combustion is the continuing reaction of a fire.
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Ignition is the initial stage of fire.
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The fire triangle represents the three components necessary for maintaining a fire
- Fuel (solid, liquid or gas)
- Oxygen (to sustain combustion)
- Heat (applied heat to ignite)
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Removing one component from the fire triangle will extinguish the fire.
- Example: Removing the fuel by taking away a flammable substance, or cooling the heat to stop the reaction.
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Different types of fuels have different characteristics.
- Flashpoint: The temperature where a substance releases enough vapor to ignite.
- Fire point: The temperature where sustained combustion can occur
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Flammable liquids have a flash point below 38°C and are more hazardous than combustible liquids which have flash points between 38°C - 94°C.
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Combustion of solid fuels occurs when heat is applied to a solid, releasing flammable vapors that ignite and burn.
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Combustion of liquid fuels releases vapor that burns, but the liquid itself does not burn.
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Common ignition sources include open flames, mechanical action, and electrical sources.
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Classes of fire:
- Class A: Ordinary combustible solids (wood, textiles, etc)
- Class B: Flammable or combustible liquids (oil, paints, etc).
- Class C: Flammable gases
- Class D: Combustible metals
- Class F: Cooking mediums (vegetable or animal fats)
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Common methods to extinguish a fire include removing the fuel, cooling the material, and excluding oxygen.
Products of Combustion
- Combustion produces thermal and non-thermal products.
- Thermal products include heat and flame
- Non-thermal products include smoke and gases.
- Some combustion gases can be corrosive or harmful if mixed with water.
- Heat from a fire can cause considerable damage to property, including the potential collapse of steel structures.
Types of Explosions
- Explosions are rapid, violent oxidation reactions that produce heat, smoke, light, and overpressure.
- Physical explosions occur due to physical forces
- Chemical explosions occur due to rapid chemical reactions.
- Explosions are often classified based on the presence of flammable gases and vapors, dusts, and other flammable materials.
- Hazardous areas (like Zones) are classified by proximity to flammable substances.
- Preventing explosions involves controlling ignition sources and eliminating potential explosive atmospheres.
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Description
Explore the fundamental concepts of fire chemistry, including the fire triangle and the components necessary for combustion. This quiz will test your understanding of ignition, fuel types, and the principles governing fire behavior. Learn how to identify the characteristics of different fuels and their relevance to fire safety.
