NAFI CFEI Exam Practice Test | 200 Questions with Verified
Answers | Latest 2025/2026 | 100% Correct| Graded A.
Flammable/Explosive Range
The range between the upper flammable/explosive limit and lower flammable/explosive limit in
which a substance can be ignited. Expressed as a percentage of ignitible gas or vapor in air by
volume.
Lower Explosive Limit
The minimum percentage of fuel in air (by volume) in which combustion can occur.
Upper Explosive Limit
The maximum percentage of fuel in air (by volume) in which combustion can occur.
Heat Transfer
The transport of heat energy from one point to another caused by temperature difference between
those points.
Empirical Temperature Scale
The measure of temperature in relation to convenient and stable parameters, such as the freezing
and boiling point of water.
Fahrenheit
A temperature scale with the freezing point of water 32 degrees and the boiling point of 212
degrees.
CODE
A standard that is an extensive compilation of provisions covering broad subject matter or that is
suitable for adoption into law independently of other codes and standards.
GUIDE
A document that is advisory or informative in nature and that contains only non mandatory
provision. This may contain mandatory statements such as when it can be used, but the document
as a whole is not suitable for adoption into law.
Recommended Practice
A document that is similar in content and structure to a code or standard but that contains only
non mandatory provisions using the word "should" to indicate recommendations in the body of
the text.
,STANDARD
An NFPA document, the main text of which contains only mandatory provisions using the word
"shall" to indicate requirements and that is in a form generally suitable for mandatory reference
by another __________ or code or for adoption into law.
Absolute Temperature
A temperature measured in Kelvins (K) or Rankines (R).
Accelerant
A fuel or oxidizer, often an ignitible liquid, intentionally used to initiate a fire or increase the rate
of growth or spread of fire.
Accident
An unplanned event that interrupts an activity and sometimes causes injury or damage or a
chance occurrence arising from unknown causes; an unexpected happening due to carelessness,
ignorance, and the like.
Active Fire Protection System
A system that uses moving mechanical or electrical parts to achieve a fire protection goal.
Ambient
Someone's or something's surroundings, especially as they pertain to the local environment; for
example, ambient air and ambient temperature.
Ampacity
The maximum current, in amperes, that a conductor can carry continuously under the conditions
of use without exceeding its temperature rating.
Ampere
The unit of electric current that is equivalent to a flow of one coulomb per second.
Arc
High-temperature luminous electric discharge across a gap or through a medium such as charred
insulation.
Arc Mapping
Identifying and documenting a fire pattern derived from the identification of arc sites used to aid
in determining the area of fire origin or spread.
Arc Melting
, Melting of conductors and conducting surfaces as a result of electrical arcing.
Arc Site
The location on a conductor with localized damage that resulted from an electrical arc.
Arcing through Char
Arcing associated with a matrix of charred material that acts as a semiconductive medium.
Area of Origin
A structure, part of a structure, or general geographic location within a fire scene, in which the
"point of origin" of a fire or explosion is reasonably believed to be located.
Arrow Pattern
A fire pattern displayed on the cross-section of a burned wooden structural member.
Arson
The crime of maliciously and intentionally, or recklessly, starting a fire or causing an explosion.
Autoignition
Initiation of combustion by heat but without a spark or flame.
Autoignition Temperature
The lowest temperature at which a combustible material ignites in air 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.
Bead
A rounded mass of resolidified metal on the end of the remains of an electrical conductor or
conductors that was caused by arcing and is characterized by a sharp line of demarcation
between the melted and unmelted conductor surfaces.
Blast Pressure Front
The expanding leading edge of an explosion reaction that separates a major difference in
pressure between normal ambient pressure ahead of the front and potentially damaging high
pressure at and behind the front.
BLEVE
Boiling Liquid Expanding Vapor Explosion
Answers | Latest 2025/2026 | 100% Correct| Graded A.
Flammable/Explosive Range
The range between the upper flammable/explosive limit and lower flammable/explosive limit in
which a substance can be ignited. Expressed as a percentage of ignitible gas or vapor in air by
volume.
Lower Explosive Limit
The minimum percentage of fuel in air (by volume) in which combustion can occur.
Upper Explosive Limit
The maximum percentage of fuel in air (by volume) in which combustion can occur.
Heat Transfer
The transport of heat energy from one point to another caused by temperature difference between
those points.
Empirical Temperature Scale
The measure of temperature in relation to convenient and stable parameters, such as the freezing
and boiling point of water.
Fahrenheit
A temperature scale with the freezing point of water 32 degrees and the boiling point of 212
degrees.
CODE
A standard that is an extensive compilation of provisions covering broad subject matter or that is
suitable for adoption into law independently of other codes and standards.
GUIDE
A document that is advisory or informative in nature and that contains only non mandatory
provision. This may contain mandatory statements such as when it can be used, but the document
as a whole is not suitable for adoption into law.
Recommended Practice
A document that is similar in content and structure to a code or standard but that contains only
non mandatory provisions using the word "should" to indicate recommendations in the body of
the text.
,STANDARD
An NFPA document, the main text of which contains only mandatory provisions using the word
"shall" to indicate requirements and that is in a form generally suitable for mandatory reference
by another __________ or code or for adoption into law.
Absolute Temperature
A temperature measured in Kelvins (K) or Rankines (R).
Accelerant
A fuel or oxidizer, often an ignitible liquid, intentionally used to initiate a fire or increase the rate
of growth or spread of fire.
Accident
An unplanned event that interrupts an activity and sometimes causes injury or damage or a
chance occurrence arising from unknown causes; an unexpected happening due to carelessness,
ignorance, and the like.
Active Fire Protection System
A system that uses moving mechanical or electrical parts to achieve a fire protection goal.
Ambient
Someone's or something's surroundings, especially as they pertain to the local environment; for
example, ambient air and ambient temperature.
Ampacity
The maximum current, in amperes, that a conductor can carry continuously under the conditions
of use without exceeding its temperature rating.
Ampere
The unit of electric current that is equivalent to a flow of one coulomb per second.
Arc
High-temperature luminous electric discharge across a gap or through a medium such as charred
insulation.
Arc Mapping
Identifying and documenting a fire pattern derived from the identification of arc sites used to aid
in determining the area of fire origin or spread.
Arc Melting
, Melting of conductors and conducting surfaces as a result of electrical arcing.
Arc Site
The location on a conductor with localized damage that resulted from an electrical arc.
Arcing through Char
Arcing associated with a matrix of charred material that acts as a semiconductive medium.
Area of Origin
A structure, part of a structure, or general geographic location within a fire scene, in which the
"point of origin" of a fire or explosion is reasonably believed to be located.
Arrow Pattern
A fire pattern displayed on the cross-section of a burned wooden structural member.
Arson
The crime of maliciously and intentionally, or recklessly, starting a fire or causing an explosion.
Autoignition
Initiation of combustion by heat but without a spark or flame.
Autoignition Temperature
The lowest temperature at which a combustible material ignites in air 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.
Bead
A rounded mass of resolidified metal on the end of the remains of an electrical conductor or
conductors that was caused by arcing and is characterized by a sharp line of demarcation
between the melted and unmelted conductor surfaces.
Blast Pressure Front
The expanding leading edge of an explosion reaction that separates a major difference in
pressure between normal ambient pressure ahead of the front and potentially damaging high
pressure at and behind the front.
BLEVE
Boiling Liquid Expanding Vapor Explosion
