Download NAFI Test Questions | 100% Correct Answers | Verified | Latest 2024 Version and more Exams Safety and Fire Engineering in PDF only on Docsity!
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 - โโa. 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 - โโb. 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 - โโd. 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 - โโb. 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 - โโa. 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 - โโc. 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. True b. False - โโa. True In most instances, the sources of ignition energy in motor vehicle fires are the same as those associated with structural fires, arcs, overloaded wiring, open flames, and smoking materials. There are, however, some unique sources that should be considered, such as the hot surfaces of the: a. catalytic converter b. turbocharger c. manifold d. all of the above - โโd. all of the above When the engine is not running, the primary source of electrical energy in a motor vehicle is the _____________________. a. alternator b. distributor c. battery d. fuel pump - โโc. battery (can also be other components)
- When the ignition is off and the vehicle is not running, vehicle circuits having a+ 12 volt potential will still supply current from ______________ to ______________. a. battery to starter b. battery to alternator c. battery to ignition d. all of the above - โโd. all of the above When the ignition is off and the vehicle is not running, vehicle circuits will still supply current to _____________.
a. clock b. lights c. power door locks d. all of the above - โโd. 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 - โโd. all of the above Electrical problems in circuits protected by fuses cannot start a fire. a. True b. False - โโb. 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 - โโd. 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
d. 110-160 PSI - โโc. 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 - โโc. 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 - โโb. 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 - โโa. 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
d. 32- 70 - โโa. 3- 5 When exposed to heat energy from a fire, the rate of vaporization of the gasoline in the fuel tank will increase significantly. a. True b. Fals - โโa. True Sparks, as a possible source of ignition energy, especially for gasses, vapors or liquid vapors in a spray or mist form may reach temperatures as high as _____ in a vehicle traveling less than 5 mph. a. 110* F b. 560* F c. 600* F d. 1400* F - โโd. 1400* F The major components of the emission control system are: a. the exhaust gas re-circulation valve. b. charcoal canister c. variety of rubber vacuum hoses and sensors d. all of the above - โโd. all of the above The decoding of a vehicle identification number (VIN) will provide the investigator with information regarding: a. manufacturer b. engine type c. year of manufacture
b. False - โโb. 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 - โโb. False Rapid-fire growth and extensive damage are proof of an incendiary fire. a. True b. False - โโb. 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 - โโa. 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 - โโa. 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 - โโd 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 - โโd. All of the above The area of greatest destruction is always the area of origin. a. True b. False - โโb. 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 - โโd. 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 - โโb. False
a. Relays b. Electrical motors c. Alternators d. All of the above - โโd. All of the above Heat energy produced as a result or friction from a failed bearing may serve as a competent ignition source. a. True b. False - โโa. True A lit cigarette can be a competent ignition source for ______________. a. gasoline vapors. b. diesel fuel vapors. c. transmission fluid vapors. d. paper debris - โโd. paper debris A momentary electrical arc or spark can be considered as a competent ignition source for Diesel fuel at room temperatures. a. True b. False - โโb. False Factors to be considered when investigating a motor vehicle fire include: a. prevailing winds. b. vehicle orientation.
c. air temperature. d. all of the above - โโd. all of the above Vapors of ignitable liquids are heavier than air at 72 F. a. True b. False - โโa. True Any liquid or the liquid phase of any material that is capable of fueling a fire, including a flammable liquid, combustible liquid, or any other material that can be liquefied and burned is the definition for _______________________. a. accelerants b. melted thermoplastics c. ignitable liquid d. ignitable vapors - โโc. ignitable liquid When investigating a vehicle fire, information regarding safety recalls can be obtained from the _________________________. a. National Highway Traffic Safely Administration (NHTSA). b. National Safety Council. c. National Transportation Safety Board. d. All of the above. - โโa. National Highway Traffic Safely Administration (NHTSA). Properly tightened steel fuel line connections may loosen significantly merely from the heat of a vehicle fire. a. True b. False - โโa. True
During a vehicle fire, electrical components such as the horn and the wipers can suddenly operate due to fire damage. a. True b. False - โโa. 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 - โโb. False Gasoline has the highest ignition temperature of any of the liquids normally found in the engine compartment. a. True b. False - โโa. True It is always possible to determine whether the crash or the resulting fire caused a death. a. True b. False - โโb. 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 - โโd. 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 - โโa. 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 - โโa. 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 - โโa. 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. - โโd. all of the above. When evaluating the involvement of the fuel system, the fuel tank should be inspected for a. presence of gasoline
d. 1250-1500F - โโb. 560-750F What is the melting temperature of the lock wafers which are typically made of brass that are located in the ignition lock cylinder? A. 240-500 degrees F B. 560-750 degrees F C. 1710-1825 degrees F D. 1250-1500 degrees F - โโC. 1710-1825 degrees F In recreational vehicles, what are the type of energy sources that you may encounter during an investigation? A. 12 V DC B. 120/240V AC C. Generator D. All of the above - โโD. All of the above Heavy equipment is subject to the same failure modes as ordinary vehicles, but also susceptible to failure due to which of the following? A. Failure of the hydraulics B. Bearing Failures C. Ignition of the material being handled. D. All of the above - โโD. All of the above The location of the fire and the way that the windshield reacts to it may allow a determination of the compartment of origin? A. True
B. False - โโA. True A passenger compartment fire will frequently cause failure at the bottom of the windshield? A. True B. False - โโB. 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 - โโA. 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 - โโC. 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. A. Oxygen B. Carbon Dioxide C. Hydrogen D. Other acidic gasses - โโC. Hydrogen In motor vehicles, the entire frame, body and engine may be used as the ground path?
