IFSTA Chapter 14 questions with 100% correct answers graded A+

IFSTA Chapter 14 The interior of a fire building is examined by the investigator for all but which of the following? - correct answer b. The interior examination is conducted to assess the damage caused by fire suppression activities What is considered to be the most significant factor that is used by fire investigators in determining the fire origin? - correct answer a. The fire patterns that are located o the interior of a structure Which of the following describes what can be learned from fire patterns? - correct answer a. Fire patterns help the investigator determine the history of a fire from the time it started (ignition) to extinguishment b. Fire patterns can, in many instances, point the investigator to the area or areas of origin c. Fire patterns can provide information about fire communication throughout the structure after ignition and the fire fuels that were involved during the fire's progression d. A ll of the above depict what can be learned from fire patterns What is described by NFPA 921 as the "visible or measurable physical effects that remain after a fire? - correct answer a. Fire patterns Which of the following describes a type of visible or measurable physical effect that is left in place after a fire? - correct answer a. Any burned or charred materials to include structural components and/or the contents b. Discolored, melted or distorted materials c. Smoke of soot deposits that may be on the surfaces of the contents or on floors, walls, or ceilings. d. All of the above describe a form of the physical effects left after a fire The visible border or boundary of fire patterns where the fire or products of the combustion process affect a surface and leave the areas contiguous to it less affected or intact is known as which of the following? - correct answer b. Lines of demarcation If a fire is located next to a vertical surface, a plume of hot gas begins to develop above the flames, resulting in a distinct pattern. Ehat determines the shape of this pattern? - correct answer a. The pattern created is affected mostly by the distance the burning fuel package and the burning plume are located from the vertical surface. b. The pattern created is affected by the height of the ceiling c. Both A and B primarily affect the pattern that is created, (answer) What determines the height of an inverted V-pattern? - correct answer b. The actual height of the flame that is being created by the fuel package In areas where additional airflow could cause embers to burn more intensely could be confused with which of the following? - correct answer d. This could be confused with areas of low burning that was caused by an ignitable liquid pour or other intentional ignition Which of the following can form an irregular pattern on floor surfaces? - correct answer a. A pool of an ignitable liquid b. Plastics contents that are melting, flowing and then burning into the surface c. Flaming debris dropping onto the floor during a fire d. All of the above can cause an irregular pattern on floor surfaces (answer) What happens when amounts of ignitable liquid are absorbed by the material on which the liquid was poured and it seeps away from the edge of the actual pour? - correct answer c. wicking What type of irregular pattern is formed when a pool of liquid is ignited on a floor surface and the liquid keeps the surface beneath it cool as it burns, charring the outside of the pool where the ignited liquid chars the surface of the floor? - correct answer a. A donut -shaped pattern What type of pattern is found on the top edges of floor joists and is the result of fire burning downward through the floor surface above the joists (this is normally localized deep charring of the wooden joists)? - correct answer c. Saddle-shaped pattern When the sharp edges of wood structural members are exposed to flame, these sharp edges are burned away on the side of the wood member that is facing the heat source, causing a pointer to the heat source. What type of pattern is this called? - correct answer b. Arrow pattern