NAFI CFEI EXAM AND PRACTICE EXAM NEWEST
2026 TEST BANK| NAFI CERTIFIED FIRE &
EXPLOSION INVESTIGATOR (CFEI) EXAM PREP
WITH COMPLETE 350 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+ (MOST RECENT!!)
Data that is based on observation or experience and can be verified is
called:
a. Anecdotal data
b. Empirical data
c. Qualitative data
d. Categorical data - Correct Answer - empirical
The investigative tool used to graphically or in a narrative manner depict
events relating to a fire or explosion in chronological order is called:
a. Timeline
b. Systems analysis
c. Fault tree
d. Computer modeling - Correct Answer - timeline
A diagram that places, in a logical sequence, the conditions and chains
of events that are necessary for a fire or explosion to occur is called:
a. Timeline
pg. 1
,b. Systems analysis
c. Fault tree
d. Computer modeling - Correct Answer - Fault tree
A deflagration resulting from the sudden introduction of air into a
confined space containing oxygen deficient products of incomplete
combustion.
a. Flashover
b. Flameover
c. Smoke Explosion
d. Backdraft - Correct Answer - backdraft
What does the "V" in V-pattern represent?
a. Vector - pattern
b. Virtual - pattern
c. The geometric shape of the pattern
d. Represents the name of the first individual who recognized the pattern
- Correct Answer - the geometric shape of the pattern
Prior to conducting an on scene investigation many things should be
identified, including:
A. Date and time of incident
b. Size and complexity of the incident
pg. 2
,c. Purpose of the investigation
d. All of the above - Correct Answer - all of the above
The basic methodology of the fire investigation should rely on the use of
a ___________ and attention to all relevant details. – ANSWER -
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 sources,
fuel, and oxidant together – ANSWER - determine and establish
origin(s)
The process of deterring the origin, cause, development, and
responsibility as well as the failure analysis of a fire or explosion is the
definition of ________. – ANSWER - fire analysis
The process of determining the origin, cause, and responsibility for a fire
or explosions is_______. – ANSWER - fire investigation
The ________ is a systematic pursuit 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. – ANSWER - scientific method
pg. 3
, Heat transfer to another body or within a body by direct contact is
called:
a. Conduction.
b. Convection.
c. Radiation.
d. Pyrolysis. - Correct Answer - conduction
Short-term heating (less than one day) wood requires a minimum
temperature of approximately ________ ________ to ignite. –
ANSWER - 250 degrees Celsius (480 F)
This is a chemical substance that, while not necessarily combustible by
itself, can rapidly increase the rate of burning of other substances or
result in spontaneous combustion when combined with other substances.
– ANSWER - Oxidizing agent
This standard, lists oxidizing substances, regulation governing their
classification and storage requirements. – ANSWER - NFPA 400
Any substance that ignites spontaneously when exposed to air. –
ANSWER - Pyrophoric
Most minimum heat flux testing uses a test duration of______________
– ANSWER -15-20 minutes
pg. 4
2026 TEST BANK| NAFI CERTIFIED FIRE &
EXPLOSION INVESTIGATOR (CFEI) EXAM PREP
WITH COMPLETE 350 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+ (MOST RECENT!!)
Data that is based on observation or experience and can be verified is
called:
a. Anecdotal data
b. Empirical data
c. Qualitative data
d. Categorical data - Correct Answer - empirical
The investigative tool used to graphically or in a narrative manner depict
events relating to a fire or explosion in chronological order is called:
a. Timeline
b. Systems analysis
c. Fault tree
d. Computer modeling - Correct Answer - timeline
A diagram that places, in a logical sequence, the conditions and chains
of events that are necessary for a fire or explosion to occur is called:
a. Timeline
pg. 1
,b. Systems analysis
c. Fault tree
d. Computer modeling - Correct Answer - Fault tree
A deflagration resulting from the sudden introduction of air into a
confined space containing oxygen deficient products of incomplete
combustion.
a. Flashover
b. Flameover
c. Smoke Explosion
d. Backdraft - Correct Answer - backdraft
What does the "V" in V-pattern represent?
a. Vector - pattern
b. Virtual - pattern
c. The geometric shape of the pattern
d. Represents the name of the first individual who recognized the pattern
- Correct Answer - the geometric shape of the pattern
Prior to conducting an on scene investigation many things should be
identified, including:
A. Date and time of incident
b. Size and complexity of the incident
pg. 2
,c. Purpose of the investigation
d. All of the above - Correct Answer - all of the above
The basic methodology of the fire investigation should rely on the use of
a ___________ and attention to all relevant details. – ANSWER -
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 sources,
fuel, and oxidant together – ANSWER - determine and establish
origin(s)
The process of deterring the origin, cause, development, and
responsibility as well as the failure analysis of a fire or explosion is the
definition of ________. – ANSWER - fire analysis
The process of determining the origin, cause, and responsibility for a fire
or explosions is_______. – ANSWER - fire investigation
The ________ is a systematic pursuit 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. – ANSWER - scientific method
pg. 3
, Heat transfer to another body or within a body by direct contact is
called:
a. Conduction.
b. Convection.
c. Radiation.
d. Pyrolysis. - Correct Answer - conduction
Short-term heating (less than one day) wood requires a minimum
temperature of approximately ________ ________ to ignite. –
ANSWER - 250 degrees Celsius (480 F)
This is a chemical substance that, while not necessarily combustible by
itself, can rapidly increase the rate of burning of other substances or
result in spontaneous combustion when combined with other substances.
– ANSWER - Oxidizing agent
This standard, lists oxidizing substances, regulation governing their
classification and storage requirements. – ANSWER - NFPA 400
Any substance that ignites spontaneously when exposed to air. –
ANSWER - Pyrophoric
Most minimum heat flux testing uses a test duration of______________
– ANSWER -15-20 minutes
pg. 4
