Firefighter 1 Test Questions and answers 100 % verified

Firefighter 1 Test Questions and answers 100 % verified During the ____ stage of development, the three elements of the fire triangle come together in the combustion process. - Incipient Firefighters working in the exhaust portion of the flow path will: - feel the increase in temperature as the velocity and/or turbulence increases. What provides the best indicators of structural integrity? - Information gathered at the scene In a compartment fire, the interface between the hot gas layers and the cooler layer of air is commonly referred to as the: - neutral plane What is the likely result if additional air is allowed into an already-ventilated compartment fire? - Higher peak release rate Fire spreading from a wall to a nearby couch due to radiant heat transfer is an example of: - heat reflectivity Fire develops through four stages: incipient, growth, ___, and decay. - Fully-developed When a structural member such as a window, roof, or doorway fails, introducing a new source of oxygen to a fire, ___ ventilation has occurred. - unplanned Sawdust ignites more easily than a long because the sawdust has a higher: - surface-to-mass ratio A collapsed storage shed that is fully involved in flames would be an example of a: - fully-developed fuel-limited fire heat that is radiated to the insulating air layer between PPE and your body: - can cause heat stress and failure of the PPE What will establish new flow pass between the fire compartment and exterior vents of the building? - Firefighters advancing a hose line through an open door or ventilating windows to make entry into a building When a substance changes from one type of matter into another, such as two or more substances combining to form compounds, the substance undergoes a: - chemical reaction Gaseous fuels can be the most dangerous of all fuel types because they: - are already in the physical state required for ignition What occurs when a mixture of unburned fuel gases and oxygen come in contact with an ignition source? - smoke explosion Which heat transfer mechanism is dependent on several factors including the turbulence and velocity of moving gases? - convection In a compartment fire, smoke flashover indicators include rapidly increasing volume, turbulence, optical density, and: - darkening color the flow path of a structure fire is comprised of two regions: the ambient air flow in and the: - hot exhaust flow out The ___ stage of fire development occurs when the heat release rate of the fire has reached its peak. - fully developed What may occur if water is added to a burning liquid that is less dense than water? - The water may disperse the burning liquid instead of extinguishing it To ensure that the decay stage of a ventilation-limited fire is the fire's final stage, firefighters must provide a controlled transmission of a fire in the decay stage from ventilation-limited to fuel-limited, by: - restricting ventilation until the heat transfers out of the compartment What may occur in an oxidation reaction when the heat generated exceeds the heat being lost? - spontaneous ignition Which type of electrical heating occurs when the current flowing through a conductor exceeds its design limits? - overcurrent or overload Which is an indicator for potential backdraft? - pulsing smoke movement around small openings in the building How does a compartment fire affect pressure in and around gases in the compartment? - Heat from a fire increases the pressure of the surrounding gases Which statement describes a fire in the incipient stage? - the temperature is only slightly above the ambient in areas that the fire, bloom, and ceiling jet directly affect What is the most effective means of establishing awareness of hazards in commercial, industrial, and storage facilities with large fuel loads? - performing and updating pre incident surveys A fuels chemical content influences its heat release rate and it's: - heat of combustion which statement describes the factor that most influences compartment fire development? - whether the fire is fuel limited or ventilation limited Which type of buildings are subject to rapid fire spread because of many of the protective features such as gypsum wallboard and automatic fire suppression systems are not in place? - Buildings are under construction What is the measurement of the average kinetic energy in particles of a sample of matter? - temperature In a ventilation-limited compartment fire that has a large volume of flammable gases, opening a door or window could result in: - backdraft How does the self-sustained chemical reaction influence the oxidation reaction in flaming combustion? - increases the speed of the oxidation reaction The minimum temperature at which liquid gives us sufficient vapors to ignite, but does not sustain combustion, it is: - flashpoint Which means of influencing fire dynamics is typically a tactic in wildland fire fires or liquid and gas fires? - Fuel removal What occurs when a gas is compressed? - Heat is generated What is the cause of most fire deaths? - Exposure to toxic gases found in smoke and or lack of oxygen Which statement about ventilation an wind considerations is most accurate? - wind can increase the pressure inside the structure driving smoke and flames into unburned portions of the structure an on to advancing firefighters When solid fuels are heated, they begin to ___ and release fuel gases and vapors. - pyrolyze Most building codes rate construction types according to: - How long each construction type maintains its structural integrity