IFSTA 7 - Chapter 4 - Fire Dynamics Exam Questions And Answers 100% Solved

IFSTA 7 - Chapter 4 - Fire Dynamics Exam Questions And Answers 100% Solved If there are no openings for lateral movement during the growth stage of a fire, the hot gases released during combustion will fill the compartment: swirling radiant current. ing at the ceiling and filling down. rmly as the room pressure equalizes. d and downward from the neutral plane. - answerb. starting at the ceiling and filling down. Which stage of fire occurs when all combustible materials in the compartment are burning at their peak heat release rate based on the available oxygen? a.Decay b.Incipient c.Growth d.Fully developed - answerd. Fully developed In order to burn, fuel must be in a _____ state. us a d - answera. gaseous A fuel's _____ is the total amount of thermal energy released when a specific amount of that fuel burns. cal content of combustion ic content of reduction - answerb. heat of combustion Which statement about smoke is accurate? a.Smoke is a product of complete combustion. b.Smoke contains a higher concentration of oxygen than air does. c.Smoke has the potential to burn. d.Smoke has a relatively low vapor pressure. - answerc. Smoke has the potential to burn. Which element is included in the fire tetrahedron that is not part of the fire triangle model? a.Chemical chain reaction b.Heat c.Fuel d.Oxygen - answera. Chemical chain reaction The range of concentrations of fuel vapor and air within which combustion can occur is the: able (explosive) range. -sustaining range. tion (combustion) range. -burning range. - answera. flammable (explosive) range. Which type of fuel is difficult to extinguish using water as the only extinguishing agent? Select one: a.Miscible liquids b.Liquids that are less dense (lighter) than water c.Polar solvents d.Liquids that are more dense (heavier) than water - answerb. Liquids that are less dense (lighter) than water What is the primary consideration affecting how easily solid fuels ignite? a.Specific gravity b.Heat release rate c.Surface-to-mass ratio d.Total mass of the fuel - answerc. Surface-to-mass ratio Which is an example of a self-sustaining chemical reaction? a.Nonflaming combustion b.Chemical asphyxiation c.Flaming combustion d.Convective flow - answerc. Flaming combustion Which is a measure of heat energy transfer rate? a.Temperature b.Kinetic energy c.Heat flux d.Buoyancy - answerc. Heat flux Which statement about flow paths and ventilation in a structure is accurate? a.The flow is always unidirectional due to pressure differences where the heated fire gases move toward the seat of the fire. b.Once flow paths are established in a structure, it is difficult to alter or interrupt the flow of gases and ambient air. c.When firefighters make entry into a building, they establish new flow paths between the fire compartment and exterior vents of the building. d.When hot gases follow the flow path from areas of high to low pressure, they carry heat away and cool the structure. - answerc. When firefighters make entry into a building, they establish new flow paths between the fire compartment and exterior vents of the building. Slower fire development in large compartments is due to the _____ and the increased distance that radiated heat must travel from the fire to the contents that must be heated. er volume of air of building construction n-deficient atmosphere fuel loads - answera. greater volume of air Heat transfers from one body to another by three mechanisms: conduction, radiation, and: ility. odynamics. ction. ncy. - answerc. convection. The four stages of fire development are: ient, growth, fully developed, and decay. ion, ventilating, fully developed, and decay. ion, incipient, fully developed, and decay. ient, growth, pyrolysis, and decay. - answera. incipient, growth, fully developed, and decay. Most residential fires that develop beyond the incipient state become: lean to burn. limited. lation limited. aneously ignited. - answerc. ventilation limited. Development of a fire in the incipient stage depends largely upon the: cteristics and configuration of the fuel involved. cteristics of the compartment's ventilation. of the descent of the neutral plane. rature differential between the fuel and the surrounding air. - answera. characteristics and configuration of the fuel involved. When a compartment fire is in ventilation-limited decay, _____ can trigger flashover quickly. increase in temperature ing of the neutral plane duction of new oxygen duction of new fuel - answerc. introduction of new oxygen The total quantity of combustible contents of a building, space, or fire area is referred to as the: load.