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IAAI CFI Study Questions ( 2024 /2025) | Actual Questions and Answers Latest Updated 2024/2025 (Graded A+) 250+ questions compiled through the years, to assist in preparation for the IAAI CFI certification test Combustible Liquid - ✔✔A liquid with a flash point ABOVE 100F 12.5 - ✔✔If the current flowing out from an electrical panel is 12.5 amps, and it then flows through an electrical load of 1500 watts, what is the amperage of the remaining current flow of the return circuit? 1000 - ✔✔If a hair dryer draws 8.3amps (in a home with 120-volt service), what is the wattage? *Power (P) = current (I) x voltage (V) Watts = amps x volts 1987 - ✔✔The year of the first edition of NFPA 1033 1.5 times - ✔✔The recommended distance for securing the perimeter of a blast scene *That is, the distance from the furthest debris 1100°F - ✔✔What temperature in the upper gas layer causes the onset of Flashover? 1960°F - ✔✔The temperature at which copper melts
2 W/cm2 - ✔✔The measurement of the radiant heat flux (from gas layer to the floor) that indicates the onset of flashover 240 volts - ✔✔The voltage between the two hot wires at the service entrance cables in most single-family residences in the United States (single-phase service with three wires) 3 years - ✔✔The revision cycle for NFPA 921 (timespan) 350°F - ✔✔The flash point of power steering fluid 35 - 70 p.s.i. - ✔✔In high-pressure fuel-injected vehicles, this is the typical range of pressure that is used to pump fuel from a fuel tank 5 and 17 - ✔✔The lower explosive and upper explosive limit of natural gas (methane)? 680°F - ✔✔The ignition temperature of power steering fluid Fuel - ✔✔Any substance that can undergo combustion Act or Omission - ✔✔Two factors or situations leading to a fire that may show the nature of the incident responsibility. Additional Investigative Recommendations - ✔✔This concept should not be included in a summary report of findings. Admiralty Law - ✔✔A law that may govern the fire investigation of a boat
Auto-ignition - ✔✔Initiation of combustion by heat but without a spark or flame Backdraft - ✔✔A deflagration resulting from the sudden introduction of air into a confined space containing oxygen-deficient products of incomplete combustion Backdraft - ✔✔An explosion caused by a combination of combustible materials heated to the ignition point and a sudden introduction of oxygen to support combustion Backfire Flame Arrestor - ✔✔A boat device that owners fail to keep clean, which is a frequent cause of engine compartment fires on boats Ballast - ✔✔A device on a fluorescent light fixture that transforms the voltage from normal household voltage to a higher voltage Battery - ✔✔The starter motor draws its energy from this source Beyond a Reasonable Doubt - ✔✔The burden of proof in a criminal trial Bimetallic Thermostats - ✔✔The component that controls temperature in many heat-producing appliances BLEVE - ✔✔This may occur when the vapor pressure of a liquid exceeds atmospheric pressure *And this is the most common mechanical explosion
Boiling Point - ✔✔The temperature or point at which the vapor pressure of a liquid equals the external pressure applied Bonding - ✔✔The process of electrically connecting two or more conductive objects Bottom Passenger Side of the Windshield - ✔✔Most engine fires typically penetrate the interior compartment at this location of the vehicle Brass Prongs (male ends) - ✔✔An investigator can closely examine this component of a cord to determine if it was plugged into a receptacle Calcination - ✔✔The chemical and physical changes that occur in gypsum wallboard surfaces during a fire Carbon Monoxide - ✔✔A narcotic gas that one might be exposed to in the fire Carbon Monoxide - ✔✔The levels of this toxin dissipate over time after removal from the fire environment. Carbon Monoxide Poisoning - ✔✔This toxic condition does NOT cause a cherry- pink coloration to the skin of the fire victim and is NOT visible on all skin types Carburetor Backfire - ✔✔This occurrence is the most common open-flame ignition source in non-fuel injected vehicles Ceiling jet - ✔✔When the fire plume reaches the ceiling of a room and moves laterally along the ceiling
Conduction - ✔✔An example of heat transfer, when the heating of a steel beam to an unexposed part of a building results in a fire in that location Connection Points - ✔✔Overheating on a circuit is most likely to occur at this location on a circuit Joint Investigation - ✔✔Consensus agreement between interested parties should be developed prior to the commencement of WHAT? Crazing - ✔✔Complicated patterns in glass Crime Scenes - ✔✔A type of scene or circumstances, in which fires do NOT always destroy all physical evidence Current (amperage) - ✔✔A factor in OHM's law that can be calculated if you know resistance and voltage Deductive Reasoning - ✔✔The reasoning in the scientific method used to test an hypothesis Deductive Reasoning - ✔✔The reasoning process of moving from generalizations to particular assertion (*"Reduce to Deduce" *Test hypothesis ("deduce") *Test based on known facts *More confident assertion than induction)
Demonstrative Evidence - ✔✔Type of evidence consisting of tangible items *as opposed to Testimonial Evidence or Documentary (written) Evidence Depth of Char - ✔✔A burn pattern analysis that is MORE useful for evaluating fire spread, rather than length or intensity of burning Differential - ✔✔All voltages are _________________, which means that a battery or DC generator creates a potential difference that can force charge through a wire Diffusion Flame Burning - ✔✔The ordinary sustained burning mode in most fires Document and Carefully Move - ✔✔By taking these two steps, an investigator can obtain the manufacturer's name, model & serial numbers, manufacture date, and any warnings on an appliance, determined to be in the area of fire origin Documentary Evidence - ✔✔What type of evidence is an investigator's report? Documentation - ✔✔A key method used by investigators when an appliance is determined to be in the area of origin, particularly the positioning of all controls and components. DOT Standards - ✔✔The standards that gas cylinders must conform to (Dept. of Transportation) Dual Element Fuses - ✔✔Types of fuses that have one element for overloads and another element for short circuits
Fire Death Team - ✔✔A team comprised of a homicide detective, medical examiner, and fire investigator Fire Dynamics Analysis - ✔✔A type of analysis used to predict fire phenomena and characteristics of the environment Fire Effects - ✔✔Observable or measurable changes in or on a material as the result of a fire Fire Growth Rate - ✔✔Once a fuel is ignited in a motor vehicle, any additional fuels contained in the vehicle have significant effect on WHAT fire factor? Fire Intensity - ✔✔In a wildland fire, this fire characterisic is indicated by the degree of damage to the wildland fuel Fire Origin - ✔✔This investigative determination is based on witness information, fire patterns, arc mapping, and fire dynamics Fire Scene Access - ✔✔The fifth and sixth amendments DO NOT answer questions regarding constitutional protections in relation to WHAT fire investigation aspect? (4th amendment issue) Fire Scene Reconstruction - ✔✔Recreating pre-fire positions of contents Fire-rated Door - ✔✔This type of door must be used when installed in a fire-rated wall.
First or Second Degree Burns - ✔✔This is the typical extent of thermal injuries sustained from an explosion flame front, due to the very short duration. Flame Spread Rating - ✔✔A system used to rate a material's flame spread potential. And these are the categories: Class A: Flame spread index 0- 25 Class B: Flame spread index 26- 75 Class C: Flame spread index 76- 200 Flammable Gases - ✔✔This type of fuel can only be ignited by a spark or pilot flame over specific ranges of gas concentration Flammable Liquid - ✔✔A liquid with a flash point below 100F Flash point - ✔✔The characteristic of an appropriate mixture of vapor-to-air, which will cause it to ignite when subjected to an ignition source Flash Point - ✔✔A specific fuel characteristic, which will have little or no significance when the fuel is released in a spray form. Flashover - ✔✔In this phenomenon, the radiant ignition of exposed combustible materials is key Flashover - ✔✔This phenomenon will occur in a compartment with a low ceiling and fire on the floor, before the same fire in a room with high ceilings
Government Institute - ✔✔NFPA is not this type of institute Guide - ✔✔NFPA 921 is this type of document Guidelines - ✔✔The information presented in NFPA 921 establishes WHAT? Hazards - ✔✔Biological, chemical, physical, and radiological are examples of this concept that fire investigators should be aware of when investigating a fire scene Header - ✔✔The first cutting unit on a combine Heat flux - ✔✔The measure of the rate of heat transfer to a surface Heat of Combustion - ✔✔The amount of heat released during complete combustion, which is considered a constant for a specific fuel (Generally considered a material property and therefore a constant for a specific fuel) Heat of Ignition - ✔✔The heat energy that brings about ignition (divided into two parts: (a) equipment involved in ignition and (b) form of heat of ignition) Heat Release Rate - ✔✔The fire characteristic that most affects fire growth during the pre-flashover phase of a fire
Heat transfer - ✔✔The transport of heat energy from one point to another point, caused by temperature difference between those points Heat transfer - ✔✔The fire phenomenon responsible for much of the physical evidence used by fire investigators High-Order Damage - ✔✔The shattering type of explosion damage H.I.N. - ✔✔The type of number an investigator should look for during a boat fire investigation Hot Surfaces - ✔✔This vehicle component will NOT usually ignite gasoline Human Body Fat - ✔✔Component of the human body that will act as a fuel and sustain a flame Hypergolic Material - ✔✔Any substance that will spontaneously ignite or explode upon exposure to an oxidizer. Hypergolic Materials - ✔✔Materials that can react with each other Ignitable Liquid - ✔✔A type of material that, when trapped in a concrete floor, can be recovered by using lime, diatomaceous earth, or non-self-rising flour. Ignition by Electrical Energy - ✔✔Ignition that involves transferring sufficient heat to a fuel by passage of electrical current to ignite material that is closeby
Inverted Cone Pattern - ✔✔This fire pattern is often caused by a natural gas leak Inverted Cone Patterns - ✔✔Fire patterns commonly created when a vertical flame plume does not reach the ceiling Team Leader Committee - ✔✔In what group is one representative selected from each investigative party? Irregular Pattern - ✔✔A certain pattern that is not necessarily an indicator of the presence of an ignitable liquid Job Performance Requirement - ✔✔A professional description that (1) describes the specific job task, (2) lists items necessary to complete the task, and (3) describes measurable outcomes and evaluations for the task Joint Investigations - ✔✔These can occur simultaneously and involve separate and independent examinations through which each party may develop an independent hypothesis Kerosene - ✔✔Which of these fuels has the lowest ignition temperature: kerosene, gasoline, methane, or propane? Kinetic Energy - ✔✔The type of energy that is converted suddenly from potential energy during an explosion, with the production and release of gases under pressure. Laboratory Analysis - ✔✔This entity must confirm any sample obtained by canine alert, to be considered valid
Lack of Stability - ✔✔One of the most dangerous situations an investigator may encounter when examining a boat afloat after a fire Laminated Wood - ✔✔This material is NOT acceptable to be used on the exterior (but is acceptable for the interior). Latent Heat of Vaporization - ✔✔The amount of heat absorbed by a substance during its change from a liquid to vapor Lightning - ✔✔Static electricity flowing from cloud to ground or from cloud to cloud Lightning - ✔✔One form of static electricity Cloud-to-Cloud - ✔✔The lightning occurrence that is less likely to cause a fire (compared to cloud-to-ground) Lines of Demarcation - ✔✔Borders of fire patterns Low-Order Damage - ✔✔Type of explosion damage that heaves or pushes Melt and Fuse Together Lengthwise - ✔✔Fire often causes standard copper conductors to do WHAT? Movement and Intensity - ✔✔The two basic types of fire patterns
Noncombustible - ✔✔Type of construction principally used in industrial type buildings Nondisclosure Agreement - ✔✔This protects confidential, trade secret, and propriety information in a fire investigation Occupant Access - ✔✔During a major investigation involving multiple tenants, this should NOT be allowed until after the entire area has been examined and safety concerns have been addressed Exterior Walls - ✔✔The primary difference between Ordinary and Frame constructions involves mostly the construction of WHAT? Outside Screw and Yoke - ✔✔One type of valve commonly used to control water flow to fire sprinkler system *which is open when the position of the stem is up Overcurrent - ✔✔The electrical compromise between an energized wire and a ground wire Overhaul - ✔✔The process of extinguishing hotspots and searching for hidden fires, after suppression efforts Oxidation - ✔✔A chemical reaction that combines a substance with oxygen Oxidation - ✔✔The basic chemical process associated with combustion
Oxide Interface - ✔✔This occurs when there is a poor electrical connection Paper - ✔✔A material that is NOT commonly subject to self-heating Photography - ✔✔While the scene is being "dug out" or excavated, this technique is used throughout the investigation process to document the sequence of events. Physical Evidence of the Cause - ✔✔When the origin is clearly defined, it is possible to make a credible determination regarding the cause of the fire, even without the availability of WHAT? Polyurethane Sofa - ✔✔A fuel item that has the greatest peak heat release rate (in unconfined burning). Pooled Blood under the Body - ✔✔This evidence can be identified, which indicates pre-death trauma in a fire fatality Post-indicator Valve - ✔✔This device is generally used to control the flow of water to a sprinkler system, hydrant, or another device with underground piping Power - ✔✔The rate at which energy is used Preservation - ✔✔This concept regarding physical evidence and the fire scene in general is NOT the sole responsibility of the fire investigator. Protection Device - ✔✔The remains of this component of an appliance may indicate if it was operating at the time of the incident
