Fire Safety and Combustion Quiz
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Questions and Answers

What is the upper flammable limit (UFL)?

  • The concentration of a substance in water.
  • The minimum temperature at which a substance ignites.
  • The richest mixture that is still flammable. (correct)
  • The temperature at which vapor density is measured.

    • How does the autoignition temperature change with pressure and oxygen concentration?

  • It increases with lower oxygen concentration.
  • It increases with higher pressure.
  • It remains constant regardless of pressure.
  • It decreases with higher pressure. (correct)

    • What does a specific gravity greater than or equal to one indicate about a liquid?

  • It has a higher boiling point than water.
  • It is heavier than water. (correct)
  • It will float on water.
  • It will evaporate more quickly than water.

    • What is the significance of vapor density being greater than or equal to one?

    <p>The substance will tend to sink to lower levels.</p> Signup and view all the answers

    What does a substance having an evaporation rate of less than 1 indicate?

    <p>It evaporates more quickly than butylacetate.</p> Signup and view all the answers

    What is combustion?

    <p>A chemical reaction between a fuel and an oxidizing agent producing energy.</p> Signup and view all the answers

    At which flash point is a liquid classified as combustible?

    <p>Between 140°F and 200°F</p> Signup and view all the answers

    What defines a flammable liquid?

    <p>Any liquid with a flash point below 140°F and vapor pressure not exceeding 40 psia.</p> Signup and view all the answers

    What does the flash point indicate?

    <p>The temperature at which a liquid can ignite in air.</p> Signup and view all the answers

    Which class of fire involves common combustibles like wood and paper?

    <p>Class A</p> Signup and view all the answers

    Which materials are associated with Class B fires?

    <p>Flammable liquids and gases</p> Signup and view all the answers

    Which type of fire extinguisher is specifically designed for combustible cooking media?

    <p>Class K</p> Signup and view all the answers

    What does the numeric rating on a Class A fire extinguisher signify?

    <p>The amount of extinguishing material in gallons</p> Signup and view all the answers

    Which of the following fire extinguishing agents can cause an exception for hydrostatic testing?

    <p>Calcium-chloride</p> Signup and view all the answers

    In which situation would a dry pipe fire suppression system be most appropriately installed?

    <p>In a parking garage</p> Signup and view all the answers

    What does a rating of 5BC on a fire extinguisher indicate?

    <p>Coverage for Class B and C fires up to 5 square feet</p> Signup and view all the answers

    Which class of fire extinguishers is appropriate for energized electrical equipment?

    <p>Class C</p> Signup and view all the answers

    What should be avoided to ensure the effectiveness of fire extinguisher hydrostatic tests?

    <p>Repairs by soldering or welding</p> Signup and view all the answers

    Which type of fire class involves combustible metals?

    <p>Class D</p> Signup and view all the answers

    What kind of systems are more frequently installed in locations where water is available at all times?

    <p>Wet Pipe Systems</p> Signup and view all the answers

    What temperature must be reached for water to flow in dry pipe systems?

    <p>Below 40°F</p> Signup and view all the answers

    Which system is specifically designed for high challenge fires, such as those involving flammable liquids?

    <p>Foam Water Sprinkler Systems</p> Signup and view all the answers

    How are deluge systems activated?

    <p>By a fire alarm system</p> Signup and view all the answers

    What is a defining characteristic of water spray systems compared to other fire suppression systems?

    <p>They have designed spray patterns for specific hazards</p> Signup and view all the answers

    Which system combines aspects of wet, dry, and deluge systems?

    <p>Preaction Systems</p> Signup and view all the answers

    Which of the following describes a primary use of foam water sprinkler systems?

    <p>Areas where accidental discharge is undesirable</p> Signup and view all the answers

    What happens when a deluge valve in a deluge system is triggered?

    <p>Water is released immediately into the distribution system</p> Signup and view all the answers

    What must be done to reset a deluge system after activation?

    <p>Manually reset the deluge valve</p> Signup and view all the answers

    Why is water not present in the pipe of a dry pipe system under normal conditions?

    <p>Water is only added when a fire is detected</p> Signup and view all the answers

    What type of environments typically utilize preaction systems?

    <p>High-risk areas where accidental discharge must be avoided</p> Signup and view all the answers

    What is the maximum allowable spacing between sprinklers in a light-hazard occupancy area?

    <p>15 feet</p> Signup and view all the answers

    What distinguishes a fire point from a flash point?

    <p>Fire point allows for continuous burning after ignition</p> Signup and view all the answers

    In which type of occupancy area is the maximum distance between sprinkler heads 12 feet?

    <p>Extra-hazard</p> Signup and view all the answers

    What defines light components in a fluid mixture?

    <p>Components with high vapor pressures</p> Signup and view all the answers

    What does vapor pressure depend on?

    <p>Liquid temperature</p> Signup and view all the answers

    What is the difference between vapor pressure and saturation pressure?

    <p>Vapor pressure refers to the liquid phase, saturation to its vapor phase</p> Signup and view all the answers

    Which occupancy area also has a maximum spacing of 15 feet for sprinkler heads?

    <p>Light-hazard</p> Signup and view all the answers

    What does the term 'combustibility of contents' refer to?

    <p>The capacity of materials to ignite and burn</p> Signup and view all the answers

    Which factor primarily indicates that an area is classified as ordinary-hazard?

    <p>Low rates of heat release expected</p> Signup and view all the answers

    Study Notes

    Domain 5: Fire Protection and Prevention

    • Domain 5 constitutes 10.59% of the overall curriculum.

    Definitions

    • Combustion: A chemical reaction between a fuel and an oxidizer, releasing energy (heat and light).
    • Heat of combustion: The amount of heat released when 1 gram of a substance is burned.
    • Combustible liquid: Any liquid with a flash point of 140°F or higher and below 200°F.
    • Flammable liquid: Any liquid with a flash point below 140°F and a vapor pressure not exceeding 40 psia at 100°F.
    • Flash point: The lowest temperature at which a liquid gives off enough vapor to form an ignitable mixture with air.
    • Upper flammability limit (UFL): The maximum concentration of a combustible substance that will support a flame.
    • Lower flammability limit (LFL): The minimum concentration of a combustible substance that will support a flame.

    Classification of Fires

    • Class A: Fires involving common combustibles (wood, paper, cloth, rubber, trash).
    • Class B: Fires involving flammable liquids, gases, solvents, oil, etc.
    • Class C: Fires involving energized electrical equipment.
    • Class D: Fires involving combustible metals (e.g., magnesium, sodium).
    • Class K: Fires involving combustible cooking media (oils and grease).

    Portable Fire Extinguishers

    • Hazard Level and Travel Distances: Different classes of fires require different rated extinguishers, and their distances from the hazard vary.
    • Coverage Area: Extinguishers rates are given for certain areas.
    • Exceptions for Hydrostatic Testing: Some exceptions apply to the testing requirements for portable extinguishers.

    Automatic Sprinkler Systems

    • Dry Pipe Systems: Installed in areas prone to freezing, no water initially in the pipes.
    • Wet Pipe Systems: Water is always present in the pipes.
    • Water Spray Systems: Similar to deluge systems but with adjusted nozzle spray patterns.
    • Deluge Systems: Installed in areas with significant hazard risk for rapid fire spread.
    • Preaction Systems: A hybrid system combining features of dry and wet systems, activated by a fire detection system.
    • Foam Water Sprinkler Systems: Designed for flammable liquids and other high-risk materials.

    Sprinkler Head Color Codes

    • Specific color codes correspond to maximum ceiling temperatures.

    Flammable and Combustible Liquid Classifications

    • Flammable liquids: Flash point below 73°F (23°C). Boil point Below 100°F.
    • Combustible liquids: Flash point at or above 100°F (38°C). Boil point is either above 100 or 140, or 200F.

    Fire Hydrant Color Codes

    • Fire hydrant colors indicate flow rate.

    Additional Safety Information

    • Inside Storage Rooms: Storage rooms for flammable/combustible liquids need specific ventilation and spacing rules.
    • Fire "RACE" Rule: An acronym for responding to a fire (Rescue, Activate, Contain, Extinguish).
    • Compressed Gas: A classification for compressed gases used in industrial and other applications.

    Storage Requirements

    • Maximum Allowable Size of Containers (OSHA): Guidelines for storing flammable and combustible liquids, specifying container types and maximum allowable sizes.

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    Related Documents

    Domain 5 - Fire Protection and Prevention PDF

    Description

    Test your knowledge on fire safety concepts, including flammable limits, ignition temperatures, and characteristics of combustible materials. This quiz covers essential definitions and classifications related to fire hazards and safety protocols. Perfect for students and professionals in fire science or safety engineering.

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