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NEW QUESTION # 61
What type of property classifications experience the majority of fire deaths in the United States?
Answer: D
Explanation:
Explanation
The type of property classifications that experience the majority of fire deaths in the United States areone- and two-family dwellings.According to the NFPA, one- and two-family dwellings accounted for 64 percent of all civilian fire deaths in 2021, followed by apartments with 11 percent, and other residential properties with 1 percent1.One- and two-family dwellings are more vulnerable to fire fatalities because they often lack adequate fire protection systems, such as smoke alarms and sprinklers, and havemore potential sources of ignition, such as cooking, heating, and smoking2. Additionally, one- and two-family dwellings may have less escape routes, longer response times, and more occupants, especially children and elderly, who are at higher risk of fire death.References:
US Fire Loss in 2021 NFPA
Home Structure Fires - NFPA
[Fire Death Rate Trends: An International Perspective]
NEW QUESTION # 62
Which of the following heat transfer values is relevant to fire protection because it defines the quantity of heat must be removed to cool a burning solid below its firepoint?
Answer: C
Explanation:
(Review)
Heat transfer
An understanding of heat (or energy) transfer is the key to an understanding of fire behaviour and fire processes. The subject deserves careful study. There are many excellent texts to which one may turn (Welty, Wilson and Wicks 1976; DiNenno 1988), but for the present purposes it is necessary only to draw attention to the three mechanisms: conduction, convection and radiation.
The basic equations for steady-state heat transfer ( ) are:
Conduction:
Convection:
Radiation:
Conduction is relevant to heat transfer through solids; (k is a material property known as thermal conductivity (kW/mK ) and l is the distance (m) over which the temperature falls from T1 to T2 (in degrees Kelvin). Convection in this context refers to the transfer of heat from a fluid (in this case, air, flames or fire products) to a surface (solid or liquid); h is the convective heat transfer coefficient kW/m2K) and depends on the configuration of the surface and nature of the flow of fluid past that surface. Radiation is similar to visible light (but with a longer wavelength) and requires no intervening medium (it can traverse a vacuum); £` is the emissivity (efficiency by which a surface can radiate), £m is the Stefan-Boltzman constant (56.7 x 10-12 kW/m2K4). Thermal radiation travels at the speed of light (3 x 108 m/s) and an intervening solid object will cast a shadow.
NEW QUESTION # 63
Which is a sign of exposure to cyanide gas?
Answer: C
NEW QUESTION # 64
How many anthrax spores are needed to cause an anthrax infection?
Answer: B
NEW QUESTION # 65
What type of load is the weight of items such as furnishings, people, and equipment?
Answer: B
Explanation:
The weight of items such as furnishings, people, and equipment represents a live load. This means it is a variable load that can change over time and is not permanently fixed to the structure.
Reference:
Fire Protection Handbook (FPH), Chapter 4, Section 4.1: Loads on Buildings NFPA 101: Life Safety Code, Chapter 5, Section 5.3: Design Loads American Society of Civil Engineers (ASCE) 7: Minimum Design Loads for Buildings and Other Structures These resources all define live loads as the weight of people, furniture, equipment, and other movable objects that are not permanently attached to the structure.
NEW QUESTION # 66
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