Metric Unit Power Question & Answer Guide (With Explanation)

This type of question evaluates analytical and critical thinking skills.

What This Question Is About

This question relates to metric unit power and requires a structured academic response.

How to Approach This Question

Use appropriate theories and support your answer with clear reasoning.

Key Explanation

This topic involves metric unit power. A strong answer should include explanation, application, and examples.

Original Question

1. A metric unit of power is: Kilowatts Calories per second Degrees Kelvin 2. As a fire progresses from a small fire in a room to a fully involved compartment. First convection is the dominant mode of heat transfer, and then _____________ takes over as the dominant mode of heat transfer. Conduction Radiation Direct Flame Contact 3. The flashpoint of which one of these fuels is above 70 ??F? Kerosene Propane Gasoline Methanol 4. The less uniform a material is, the more difficult it is to predict flame spread across it. Which one of these materials would be hardest to predict flame spread across? Carpet padding Poly methyl methacrylate (PMMA) Printer paper 5. According to “Principles of Fire Behavior”, which of these fuels has the highest mass-burning rate per unit area? Group of answer choices Heptane Wood Polystyrene Gasoline 6. When ignited, a pool of gasoline that covers an area 1 m2 has a heat release rate of approximately: 1,500 kW 2,400 kW 2,900 kW 3,200 kW 7. A 2.4 MW pool fire with a diameter of one meter has an average height of approximately: 0.9 meters 1.1 meters 3.2 meters 4.2 meters 8. A fast t-squared fire takes approximately how long to grow to 1 MW? 75 seconds 150 seconds 300 seconds 600 seconds 9. A medium t-squared fire takes approximately how long to grow to 2 MW? 300 seconds 425 seconds 675 seconds 915 seconds 10. The material that is most likely to follow an ultra-fast t^2 growth is: Gasoline Cement A thick wooden block Wool 11. This type of gas is painful to the eyes and to the respiratory system: Asphyxiants Irritants 12. This type of gas causes loss of alertness, mental function and psychomotor ability: Asphyxiants Irritants 13. Which of these gasses is NOT an asphyxiant: Carbon monoxide (CO) Carbon dioxide (CO2) Hydrogen Cyanide (HCN) Hydrochloric acid (HCL) 14. The rate at which carboxyhemoglobin (COHb) builds up in the blood is impacted by: CO concentration and exposure time Volume and rate of breathing Medical issues All of the above 15. True or false: COHb is relatively stable and can be measured in the blood long after death. True False 16. True or false: HCN is relatively stable and can be measured in the blood long after death. True False 17. HCN is approximately how many times more toxic than CO? 2x 25x 200x 18. Carbon Dioxide (CO2) contributes to fire fatalities by: Increasing respiratory rates Carbonating the smoke plume Irritating the eyes and respiratory system All of the above 19. The fractional effective dose (FED) method can be used to: Estimate time to incapacitation of a person exposed to a fire Calculate the level of COHb in a victim’s blood stream Calculate the exact time of death for a fire victim 20. When using the FED method for an average healthy adult, the level at which incapacitation would be assumed is: 0.0 0.3 1.0 2.0 21. True or False: With modern furnishings, most residential fires will progress to ventilation limited burning by the time the fire department arrives (as opposed to remaining fuel limited). True False 22. True or False: If the fire department uses positive pressure ventilation (PPV) before applying water, the fire will likely increase its heat release rate. True False 23. True or False: In a ventilation-limited fire, there will always be flames throughout an entire compartment. True False 24. Sources of ventilation can be: Open doors Open windows HVAC systems Fans All of the above 25. If a compartment has vents at two different vertical levels, the flow will tend to be: flames/hot gasses out through the high vent and fresh air in through the low vent fresh air out through the high vent and flames/hot gasses in through the low vent unrelated to the ventilation locations 26. True or False: In a ventilation-limited fire, the area of most damage will always be near the origin? True False 27. True or False: The position (open or closed) of doors in a building can impact how the fire travels throughout the space. True False 28. (Spreadsheet review) In a closed room that is 20’x15′ with 8′ ceilings, approximately how long will it take a medium t-squared fire to reduce the oxygen level to 14%? 28 seconds 285 seconds 615 seconds 28.5 minutes 29. (Spreadsheet review) A gasoline pool has a diameter of 0.5m. What is the approximate heat release rate of this fire? Hint: the radius of a circle is half of the diameter. 125 kW 480 kW 750 kW 1250 kW 30. (Spreadsheet review) Using data from a smart-meter, you find that natural gas was flowing into a warehouse at a flow rate of 300 m3/hr for a period of four hours before an explosion occurred. You don’t yet know where the leak was, but the total volume of the warehouse was 300,000 cubic feet. Assume 0.5 air changes per hour. True or False: The four hours was long enough to reach a flammable mixture in the space. True False

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