NAFI CFEI PRACTICE EXAM | QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS GRADED A+ | LATEST
EXAM UPDATE
Fire
A rapid oxidation process which is a chemical reaction resulting in the evolution
of light and heat in varying intensities
Fire Plume
Creation of hot gases by fire; the hot gases rise above the fire itself
Flame Spread
Classified as concurrent or counterflow:
concurrent (wide-aided flame spread) occurs when flame spread direction is the
same as the gas flow or wind direction; counterflow-(opposed flame spread)
occurs where the flame spread direction is counter to or opposed to the gas flow
Heat
a form of energy characterized by vibration of molecules and capable of
initiating and supporting chemical changes and changes of state
Ignition Temperature
Minimum temperature a substance should attain in order to ignite under specific
test conditions
Lower Explosive Limit (LEL)
The minimum percentage of fuel in air (by colume) in which combustion can
occur
Upper Explosive Limit (UEL)
The maximum percentage of fuel in air in which combustion can occur
Melting Point
Phase change; the material changes from a solid to a liquid with no change in
the chemical structure of the material (melting candle wax)
Pyrolysis
,A process in which material is decomposed. or broken down, into simpler
molecular compounds by the effects of heat alone; pyrolysis often precedes
combustion
Specific Gravity (Vapor Density)
The ratio of the average molecular weight of a gas or vapor to the average
molecular weight of air
Specific Gravity
The ratio of the mass of a given volume of a subtance to the mass of an equal
volume of water at a temperature of 4*C
Combustible Liquid
Flash Point @ or above 100*F
Flammable Liquid
Flash Point less tha 100*F
Ignitable Liquid
Both combustible and flammable liquids are ignitable liquids.
Demonstrative
Tangible items, see, touch, smell, hear.
Documentary
Written form; business records, banking, calenders, phone records, fire reports,
etc.
Testimonial
Competent live wtiness speaking udner oath; two types; facts and expert
Illustrative
Photos, sketches, maps, diagrams. Modes are frequently used at trial. Photos
and Videos; what, why, how.
Evidence Collection
Document in place, document the collection, use proper container, (flag, bag,
and tag)
Heat Transfer
, The transport of heat energy from one point to another caused by a temperature
difference between those points
True
T/F: Sparks from an aluminum wheel are not competent ignition source
True
T/F: The most common source of an open flame in a vehicle is an exhaust
system backfire out of a carburetor
True
T/F: Carburetor backfire leaves a distinct pattern on the hood
True
T/F: Overcharging a battery does not cause it to explode
Low Order Damage
Characterized by walls bulge out or laid down, virtually intact, next to the
structure. Roofs slightly left.
High Order Damage
Shattering of the structure, producing small debris pieces
Post Blast Effects
Burned debris away- fire preceded, unburned the debris away- no fire
Spalling
Loss of surface material due to cracking, breaking, chipping, breakdown in
surface tensile strength, moisture present in the concrete, may appear lighter in
color.
Crazed Glass
Cause by rapid cooling
Air Entrainment
Process of air or gases being drawn into a fire, plume or jet
Autoignition temperature
Lowest temp at which a combustible material ignites in air without a spark or
flame
VERIFIED AND WELL DETAILED ANSWERS GRADED A+ | LATEST
EXAM UPDATE
Fire
A rapid oxidation process which is a chemical reaction resulting in the evolution
of light and heat in varying intensities
Fire Plume
Creation of hot gases by fire; the hot gases rise above the fire itself
Flame Spread
Classified as concurrent or counterflow:
concurrent (wide-aided flame spread) occurs when flame spread direction is the
same as the gas flow or wind direction; counterflow-(opposed flame spread)
occurs where the flame spread direction is counter to or opposed to the gas flow
Heat
a form of energy characterized by vibration of molecules and capable of
initiating and supporting chemical changes and changes of state
Ignition Temperature
Minimum temperature a substance should attain in order to ignite under specific
test conditions
Lower Explosive Limit (LEL)
The minimum percentage of fuel in air (by colume) in which combustion can
occur
Upper Explosive Limit (UEL)
The maximum percentage of fuel in air in which combustion can occur
Melting Point
Phase change; the material changes from a solid to a liquid with no change in
the chemical structure of the material (melting candle wax)
Pyrolysis
,A process in which material is decomposed. or broken down, into simpler
molecular compounds by the effects of heat alone; pyrolysis often precedes
combustion
Specific Gravity (Vapor Density)
The ratio of the average molecular weight of a gas or vapor to the average
molecular weight of air
Specific Gravity
The ratio of the mass of a given volume of a subtance to the mass of an equal
volume of water at a temperature of 4*C
Combustible Liquid
Flash Point @ or above 100*F
Flammable Liquid
Flash Point less tha 100*F
Ignitable Liquid
Both combustible and flammable liquids are ignitable liquids.
Demonstrative
Tangible items, see, touch, smell, hear.
Documentary
Written form; business records, banking, calenders, phone records, fire reports,
etc.
Testimonial
Competent live wtiness speaking udner oath; two types; facts and expert
Illustrative
Photos, sketches, maps, diagrams. Modes are frequently used at trial. Photos
and Videos; what, why, how.
Evidence Collection
Document in place, document the collection, use proper container, (flag, bag,
and tag)
Heat Transfer
, The transport of heat energy from one point to another caused by a temperature
difference between those points
True
T/F: Sparks from an aluminum wheel are not competent ignition source
True
T/F: The most common source of an open flame in a vehicle is an exhaust
system backfire out of a carburetor
True
T/F: Carburetor backfire leaves a distinct pattern on the hood
True
T/F: Overcharging a battery does not cause it to explode
Low Order Damage
Characterized by walls bulge out or laid down, virtually intact, next to the
structure. Roofs slightly left.
High Order Damage
Shattering of the structure, producing small debris pieces
Post Blast Effects
Burned debris away- fire preceded, unburned the debris away- no fire
Spalling
Loss of surface material due to cracking, breaking, chipping, breakdown in
surface tensile strength, moisture present in the concrete, may appear lighter in
color.
Crazed Glass
Cause by rapid cooling
Air Entrainment
Process of air or gases being drawn into a fire, plume or jet
Autoignition temperature
Lowest temp at which a combustible material ignites in air without a spark or
flame
