NAFI Test Questions | 100% Correct Answers | Verified | Latest 2024 Version, Exams of Safety and Fire Engineering

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NAFI Test Questions | 100% Correct Answers | Verified | Latest 2024 Version The basic methodology of the fire investigation should rely on the use of a ______________________ and attention to all relevant details. a. systematic approach b. approximation approach c. methodology approach d. general approach - ✔✔a. systematic approach With few exceptions, the proper methodology for a fire or explosion investigation is to first _____________________ then investigate the cause, circumstances, conditions, or agencies that brought the ignition source, fuel, and oxidant together. a. determine responsibility b. determine and establish origin(s) c. determine if it is a criminal action d. all of the above - ✔✔b. determine and establish origin(s) The process of determining the origin, cause, development, and responsibility as well as the failure analysis of a fire or explosion is the definition of _________________________. a. fire investigation b. fire scene reconstruction c. fire evaluation d. fire analysis - ✔✔d. fire analysis The process of determining the origin, cause, and responsibility for a fire or explosion is ___________________________. a. fire analysis b. fire investigation c. fire scene survey d. fire evaluation - ✔✔b. fire investigation The _____________________ is the systematic pursite of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of a hypothesis. a. scientific method b. scientific examination c. scientific survey d. scientific theory - ✔✔a. scientific method ____________________ are the visible or measurable physical effects that remain after a fire. These include thermal effects on materials, such as charring, oxidation, consumption of combustibles, smoke and soot deposits, distortion, melting, color changes, changes in character of materials, structural collapse, and other effects. a. Fire arrows b. Fire pointers c. Fire patterns d. Flammable patterns - ✔✔c. Fire patterns Distortion, breakage, deterioration, or other fault in an item, component, system, assembly, or structure that results in unsatisfactory performance of the function for which it was designed is called ________________. a. broken b. distorted a. clock b. lights c. power door locks d. all of the above - ✔✔d. all of the above (clock is not listed) Protection of electrical circuits in motor vehicles is provided by: a. fuses b. circuitbreakers c. fusible links d. all of the above - ✔✔d. all of the above Electrical problems in circuits protected by fuses cannot start a fire. a. True b. False - ✔✔b. False The most common open flame in a carburated vehicle fire is: a. lighted match b. pilot flames or operating burners c. catalytic converter d. a backfire through the carburator - ✔✔d. a backfire through the carburetor (bad question) There are two basic fuel systems used in gasoline powered motor vehicles: a. vacuum/low pressure carbureted system b. high pressure fuel injected system c. both a & b d. neither a or b - ✔✔c. both a & b The flash point of gasoline is approximately _____. a. 100* F b. 212* F c. -45* F d. 25* F - ✔✔c. -45* F Compared to gasoline, brake fluid is a higher flash point liquid. a. True b. False - ✔✔a. True Gasoline will normally not ignite on a hot surface but requires a(n) __________ for ignition. a. arc b. spark c. open flame d. any of the above - ✔✔d. any of the above In high-pressured fuel injected systems, the fuel is typically pumped from a storage tank under pressure of: a. 10-15 PSI b. 20-25 PSI c. 35-70 PSI d. 110-160 PSI - ✔✔c. 35-70 PSI (answer sheet says C or D) The fuel pump will run when the ignition key is in the _______ position. a. accessory b. off c. run d. all of the above - ✔✔c. run Leaks that develop on the supply side of the fuel lines system may present operational problems that should be noticed by the operator whereas on the return side of the system may ______________. a. cause the engine to stall b. go undetected by the operator c. appear as warning lights d. cause the engine to race - ✔✔b. go undetected by the operator In a vehicle equipped with a fuel injection system; if a fuel leak was to occur on the supply side, there is sufficient pressure to project a small fuel stream several feet in distance. a. True b. False - ✔✔a. True The pressure from the mechanical fuel pump to the carburetor system is typically in the rate of _____ PSI. a. 3-5 b. 10-20 c. 32 b. False - ✔✔b. False The urethane foam seating materials will not burn once ignited by a name and does not substantially intensify a vehicle fire. a. True b. False - ✔✔b. False Rapid-fire growth and extensive damage are proof of an incendiary fire. a. True b. False - ✔✔b. False The external temperatures of catalytic converters in automobiles can reach temperatures high enough to ignite ordinary combustibles under normal operating conditions and can become higher when ventilation and air circulation are restricted. a. True b. False - ✔✔a. True The vehicle identification number of a vehicle may be found on the ________________. a. dash of the vehicle b. Federal Theft Prevention Standard label c. Federal Emissions Certification label d. all of the above - ✔✔a. dash of the vehicle Documentation of the vehicle fire incident can be accomplished through ____________________. a. photographs b. written notes c. diagrams d. all of the above - ✔✔d all of the above _______________ are common sources of ignition for fires in vehicles. a. Electrical arcs b. Hot surfaces c. Open flames d. All of the above - ✔✔d. All of the above The area of greatest destruction is always the area of origin. a. True b. False - ✔✔b. False Which of the following can affect the flash point of lubricating oils? a. contamination of the lubricating oil b. the age (length of service) of the oil c. the chemical composition d. all of the above - ✔✔d. all of the above Evidence of a mechanical failure in an engine or transmission is proof of a motive for vehicle arson. a. True b. False - ✔✔b. False A dragging or improperly adjusted brake can overheat to the point a fire can occur. a. True b. False - ✔✔a. True Many modern vehicles use plastic materials in the engine compartments, increasing the fuel load. a. True b. False - ✔✔a. True Corrosion of electrical wiring and components can present a fire hazard. a. True b. False - ✔✔a. True The positions of the power door locks in a vehicle that has been involved in a fire can be reliably used to determine its pre-fire positions. a. True b. False - ✔✔b. False The surface temperature of engine components increase during the heat (hot) soak period, rendering it a more competent ignition source for fugitive engine fluids. a. True b. False - ✔✔a. True Electrical arcs may normally occur in which component? In order to comply with FMVSS Standard 302 burning rate of the tested material must be less than a. 2 inches per minute. b. 4 inches per minute. c. 6 inches per minute. d. 14 inches perminute. - ✔✔b. 4 inches per minute. FMVSS 302 requires compliance for a. present in the passenger compartment of the vehicle. b. present in the passenger, engine and trunk of the vehicle. c. all materials within .5 inches of the air space of the passenger compartment. d. all materials in the vehicle. - ✔✔c. all materials within .5 inches of the air space of the passenger compartment. FMVSS 301 does not apply to: a. motorcycles. b. commercial passenger vehicles. c. trucks with gross weights less that I 0,000 pounds. d. passenger cars. - ✔✔a. motorcycles. Factors influencing motor vehicle safety are the _____________________. a. Vehicle's design b. Vehicle's construction c. Vehicle's materials d. All of the above - ✔✔d. All of the above During a vehicle fire, electrical components such as the horn and the wipers can suddenly operate due to fire damage. a. True b. False - ✔✔a. True Evidence of electrical wire separation and the formation of a bead are always indicative that it was the source of ignition for the fire. a. True b. False - ✔✔b. False Gasoline has the highest ignition temperature of any of the liquids normally found in the engine compartment. a. True b. False - ✔✔a. True It is always possible to determine whether the crash or the resulting fire caused a death. a. True b. False - ✔✔b. False The development of fire patterns on and in a motor vehicle may be affected by: a. airflow caused by vehicle movement. b. distribution of fuel loads. c. breaches in compartments. d. all of the above - ✔✔d. all of the above During the refueling of a motor vehicle the flow of gasoline may result in the production, accumulation and discharge of a static electrical discharge. a. True b. False - ✔✔a. True An overheated automatic transmission may result in transmission fluid being expelled from the transmission dipstick presenting a fire hazard if it comes in contact with a hot surface capable of raising the transmission fluid to its ignition temperature. a. True b. False - ✔✔a. True The continuous fuel flow from a compromised fuel line unaided by mechanical or electrical pumps is the definition of "fuel system siphoning" in motor vehicles. a. True b. False - ✔✔a. True The post collision failure of a vehicle's fuel tank can be caused by being compromised: a. due to collision forces and crush. b. as a result of exposure to fire. c. due to a mis-assembly and defective components. d. all of the above. - ✔✔d. all of the above. When evaluating the involvement of the fuel system, the fuel tank should be inspected for a. presence of gasoline B. False - ✔✔A. True A passenger compartment fire will frequently cause failure at the bottom of the windshield? A. True B. False - ✔✔B. False Undeployed supplemental restraint systems (Airbags) in vehicles can pose a hazard to the investigator if not rendered safe prior to examining the vehicle. A. True B. False - ✔✔A. True Melted metals in a vehicle do not indicate which of the following? A. Fluid line failure B. Electrical Failure C. Ignitable liquid as an accelerant D. None of the above - ✔✔C. Ignitable liquid as an accelerant In addition to providing electrical energy, the lead-acid battery can also be a source of fire in the form of what type of gas? Section 27.5.3.2 A. Oxygen B. Carbon Dioxide C. Hydrogen D. Other acidic gasses - ✔✔C. Hydrogen In motor vehicles, the entire frame, body and engine may be used as the ground path? A. True B. False - ✔✔A. True Event Data Recorders record the vehicles parameters before and just after a crash, which of the following does it not record? A. Vehicle speed B. Airbag deployment C. Electrical failure D. Engine RPM - ✔✔C. Electrical failure Engine Control Modules are generally found on which of the following vehicles? A. Fleet Trucks B. Busses C. Passenger cars D. Both A and B - ✔✔D. Both A and B