IFSTA Chapter 4 - Fire Dynamics Test correctly answered rated A+ 2023/2024

IFSTA Chapter 4 - Fire Dynamics Test What is the cause of most fire deaths? Select one: a. Exposure to extreme heat and/or contact with flames and hot surfaces b. Injuries caused by falling materials or structural collapse c. Exposure to toxic gases found in smoke and/or lack of oxygen d. Accidental injuries sustained during escape and/or evacuation procedures - correct answer c. Exposure to toxic gases found in smoke and/or lack of oxygen In most compartment fires, the energy release in fire is directly proportional to the: Select one: a. ambient temperature of the environment. b. thermal conductivity of the fuel. c. amount of oxygen available for combustion. d. amount of fuel available for combustion. - correct answer c. amount of oxygen available for combustion. Which product of combustion acts as a chemical asphyxiant by excluding oxygen from the blood, leading to hypoxia of the brain and tissues? Select one: a. Carbon monoxide (CO) b. Hydrogen cyanide (HCN) c. Carbon dioxide (CO2) d. Aerosolized fuel particles - correct answer a. Carbon monoxide (CO) Which action will transition a compartment fire in a modern structure from ventilation-limited to fuel-limited? Select one: a. Making additional openings in the compartment b. Altering the flow paths within the structure c. Extinguishing some of the fuel d. Cooling the exterior of the compartment - correct answer c. Extinguishing some of the fuel Which measurement is often used to measure how long PPE will protect a firefighter in an interior fire environment? Select one: a. Rate of rise in temperature b. Heat flux to the PPE c. Pressure of convective flow d. Temperature in the structure - correct answer b. Heat flux to the PPE What will occur if firefighters begin an attack on a ventilation-limited structure fire with ventilation alone? Select one: a. Visibility will improve, clearing path to the seat of the fire. b. The fire's heat release rate and spread will progressively increase as additional vents are made. c. The fire's heat release rate will decrease temporarily until the introduced air is heated to the fuel's ignition temperature. d. Hot gases will be pushed inward, toward the seat of the fire. - correct answer b. The fire's heat release rate and spread will progressively increase as additional vents are made. Fires develop through four stages: incipient, growth, _____, and decay. Select one: a. fully-developed b. rollover c. ventilation-limited d. radiant - correct answer a. fully-developed