NAFI CFEI Certified Fire Explosion Investigator Exam Study Guide

NAFI CFEI (Certified Fire and Explosion Investigator) Exam –
Study Guide, Practice Questions & Certification Preparation 2026-
2027
This document is a comprehensive study resource for candidates preparing for the NAFI
Certified Fire and Explosion Investigator (CFEI) certification exam. It covers essential topics
including fire dynamics, origin and cause determination, NFPA 921 principles, evidence
collection and preservation, scene documentation, fire patterns, electrical fire investigations,
interview techniques, report writing, legal considerations, and forensic investigation methods.
The guide includes practice questions, answer explanations, and exam-focused review material
designed to help fire investigators strengthen their knowledge and prepare for certification.



Origin of the fire - CORRECT ANSWER The same as the cause.

QUESTION : Electrical arcing - CORRECT ANSWER Evidence of fire origin.

QUESTION : Correct order of evidence handling - CORRECT ANSWER Collect,
package, label, document.

QUESTION : Fire tetrahedron component - CORRECT ANSWER Not including
Light.

QUESTION : Backdraft - CORRECT ANSWER Occurs when oxygen is introduced
into an oxygen-depleted environment.

QUESTION : Bias in fire investigation - CORRECT ANSWER Must be avoided by a
fire investigator.

QUESTION : First step in the scientific method - CORRECT ANSWER Form a
hypothesis.

QUESTION : Tool for evaluating circuit integrity - CORRECT ANSWER Multimeter.

QUESTION : High-order explosions - CORRECT ANSWER Result in large craters
and extensive fragmentation.

QUESTION : V-patterns - CORRECT ANSWER Always point to the point of origin.

QUESTION : Chain of custody - CORRECT ANSWER Essential for evidence
integrity.

QUESTION : Recommended method for fire investigation according to NFPA 921 -
CORRECT ANSWER Scientific method.

,QUESTION : Opinions in court - CORRECT ANSWER A fire investigator cannot
offer opinions outside their area of expertise.

QUESTION : Factors affecting fire pattern appearance - CORRECT ANSWER
Ventilation, Material type, Suppression efforts, All of the above.

QUESTION : NFPA 921 requirement - CORRECT ANSWER Requires fire
investigators to be licensed engineers.

QUESTION : Digital photographs - CORRECT ANSWER Can be altered and are
not admissible in court.

QUESTION : Cause of an explosion - CORRECT ANSWER Not typically a cause.

QUESTION : Mechanical failure - CORRECT ANSWER A failure in machinery that
can lead to accidents or incidents.

QUESTION : Dust accumulation - CORRECT ANSWER The buildup of dust that
can contribute to fire hazards.

QUESTION : Electrical short - CORRECT ANSWER A fault in an electrical circuit
that causes a current to flow along an unintended path.

QUESTION : Radiation leakage - CORRECT ANSWER The unintended release of
radiation from a source.

QUESTION : Multimeter - CORRECT ANSWER A tool typically used to evaluate
circuit integrity.

QUESTION : Bias - CORRECT ANSWER A tendency to favor one perspective over
others, which a fire investigator must avoid.

QUESTION : Ventilation - CORRECT ANSWER The process that can affect fire
pattern appearance.

QUESTION : Material type - CORRECT ANSWER The kind of material involved
which can affect fire pattern appearance.

QUESTION : Suppression efforts - CORRECT ANSWER Actions taken to
extinguish a fire that can affect fire pattern appearance.

QUESTION : Evidence handling order - CORRECT ANSWER The correct sequence
is collect, package, label, document.

QUESTION : NFPA 921 - CORRECT ANSWER A standard that requires fire
investigators to be licensed engineers.

,QUESTION : V-patterns - CORRECT ANSWER Always point to the point of origin of
a fire.

QUESTION : Scientific method - CORRECT ANSWER The recommended method
for conducting a fire investigation according to NFPA 921.

QUESTION : Form a hypothesis - CORRECT ANSWER The first step in the
scientific method.

QUESTION : Photographs - CORRECT ANSWER Should not be used as a primary
method of documentation.

QUESTION : Sketches - CORRECT ANSWER Should not be used as a primary
method of documentation.

QUESTION : Notes - CORRECT ANSWER Should not be used as a primary
method of documentation.

QUESTION : Memory - CORRECT ANSWER Should not be used as a primary
method of documentation.

QUESTION : Explosion causes - CORRECT ANSWER Mechanical failure, dust
accumulation, electrical short, and radiation leakage are not typically causes.

QUESTION : Fire tetrahedron components - CORRECT ANSWER Fuel, heat, light,
and chemical chain reaction; light is not a component.

QUESTION : Opinions in court - CORRECT ANSWER A fire investigator can offer
opinions outside their area of expertise.

QUESTION : V-patterns - CORRECT ANSWER V-patterns always point to the point
of origin.

QUESTION : Multimeter - CORRECT ANSWER The tool typically used to evaluate
circuit integrity.

QUESTION : Explosion Causes - CORRECT ANSWER Mechanical failure, dust
accumulation, electrical short, and radiation leakage are potential causes of an
explosion.

QUESTION : Backdraft - CORRECT ANSWER Backdraft occurs when oxygen is
introduced into an oxygen-depleted environment.

QUESTION : Fire Investigator Bias - CORRECT ANSWER A fire investigator must
avoid bias.

, QUESTION : Chain of Custody - CORRECT ANSWER Chain of custody is essential
for evidence integrity.

QUESTION : NFPA 921 Requirement - CORRECT ANSWER NFPA 921 requires
fire investigators to be licensed engineers.

QUESTION : Digital Photographs in Court - CORRECT ANSWER Digital
photographs can be altered and are not admissible in court.

QUESTION : Fire Pattern Appearance - CORRECT ANSWER Ventilation, material
type, and suppression efforts can affect fire pattern appearance.

QUESTION : High-order Explosions - CORRECT ANSWER High-order explosions
result in large craters and extensive fragmentation.

QUESTION : Fire Tetrahedron Components - CORRECT ANSWER Light is not a
component of the fire tetrahedron.

QUESTION : Electrical Arcing - CORRECT ANSWER All electrical arcing is
evidence of fire origin.

QUESTION : Fire Origin vs Cause - CORRECT ANSWER The origin of the fire is
the same as the cause.

QUESTION : Collect, document, label, package - CORRECT ANSWER A process
for handling materials or data.

QUESTION : Light - CORRECT ANSWER A form of electromagnetic radiation
visible to the human eye.

QUESTION : True - CORRECT ANSWER Indicates a correct statement or
affirmation.

QUESTION : False - CORRECT ANSWER Indicates an incorrect statement or
negation.

QUESTION : Bias - CORRECT ANSWER A tendency to favor one perspective over
another.

QUESTION : Recognize the need - CORRECT ANSWER The ability to identify a
requirement or necessity.

QUESTION : Multimeter - CORRECT ANSWER An instrument used to measure
voltage, current, and resistance.