NAFI Test Solved 100% Correct

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 - ANSWER-a. systematic approach With few exceptions, the proper methodolgy 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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-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 - ANSWER-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 c. failure d. faulty - ANSWER-c. failure Vehicle fire inspections may present many other situations that pose safety hazards to the investigator. These can include: a. fuel leaks b. expelled lubricants c. electrical energy stored in the battery d. all of the above - ANSWER-d. all of the above The burn or damage patterns remaining on the body panels and in the interior of the vehicle are primarily used to locate the ______________________. a. origin of the fire b. potential ignition sources c. fuel loads d. all of the above - ANSWER-d. all of the above A wide variety of materials and substances may serve as the first materials ignited in motor vehicle fires. These include engine fuels; transmission,·power steering, and brake fluids; coolants; lubricants; and the vehicle interior materials or cargo. Once a fire is started, any of these materials may contribute as a secondary fuel, affecting the fire growth rate and the ultimate damage sustained. a. True b. False - ANSWER-a. True Solid fuels are less common than liquids and gasses as the first materials ignited in motor vehicle fires. The exception would be scenarios where overloaded wiring or smoking materials are possible ignition sources or where the vehicle is subject to an exposure fire. a. True b. False - ANSWER-a. 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 - ANSWER-d. 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 - ANSWER-c. battery (can also be other components) 14. 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 - ANSWER-d. 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 - ANSWER-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 - ANSWER-d. all of the above Electrical problems in circuits protected by fuses cannot start a fire. a. True b. False - ANSWER-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 - ANSWER-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 - ANSWER-c. both a & b The flash point of gasoline is approximately _____. a. 100* F b. 212* F c. -45* F d. 25* F - ANSWER-c. -45* F Compared to gasoline, brake fluid is a higher flash point liquid. a. True b. False - ANSWER-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 - ANSWER-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