NAFI COMPREHENSIVE EXAM STUDY
GUIDE 2026 PRACTICE QUESTIONS AND
SOLUTIONS
● conduction. Answer: Heat transfer to another body or within a body
by direct contact is called:
a.Conduction.
b.Convection.
c.Radiation.
d.Pyrolysis.
● true. Answer: Fuses and circuit breakers provide protection against
electrical short circuits, ground/earth faults,and load currents that might
be damaging (i.e. overloads) to the building electrical system.Properly
functioning circuit protection may allow the elimination of the buildings
wiring system as a potential cause of the fire.
a.True
b.False
● false. Answer: In pre-flashover conditions the primary heat transfer
mechanism for fire spread through a
compartment is radiation.
a.True
, b.False
● false. Answer: In a compartment, flashover occurs because convective
heat energy raises combustible to their auto-ignition temperature.
a.True
b.False
● true. Answer: Combustion may continue with available oxygen
concentrations lower than 1 percent.
a.True
b.False
● true. Answer: The way structures react in a fire often influence how
the fire grows and spreads as well as how theymaintain their structural
integrity during the fire. Therefore, the fire investigator should
considerthe type of structure and method of construction when
completing the analysis of fire growth and spread as a part of their fire
investigation.
a.True
b.False
● false. Answer: Materials which have been properly treated with
flame-retardants will not undergo pyrolysis andfor this reason will not
ignite.
GUIDE 2026 PRACTICE QUESTIONS AND
SOLUTIONS
● conduction. Answer: Heat transfer to another body or within a body
by direct contact is called:
a.Conduction.
b.Convection.
c.Radiation.
d.Pyrolysis.
● true. Answer: Fuses and circuit breakers provide protection against
electrical short circuits, ground/earth faults,and load currents that might
be damaging (i.e. overloads) to the building electrical system.Properly
functioning circuit protection may allow the elimination of the buildings
wiring system as a potential cause of the fire.
a.True
b.False
● false. Answer: In pre-flashover conditions the primary heat transfer
mechanism for fire spread through a
compartment is radiation.
a.True
, b.False
● false. Answer: In a compartment, flashover occurs because convective
heat energy raises combustible to their auto-ignition temperature.
a.True
b.False
● true. Answer: Combustion may continue with available oxygen
concentrations lower than 1 percent.
a.True
b.False
● true. Answer: The way structures react in a fire often influence how
the fire grows and spreads as well as how theymaintain their structural
integrity during the fire. Therefore, the fire investigator should
considerthe type of structure and method of construction when
completing the analysis of fire growth and spread as a part of their fire
investigation.
a.True
b.False
● false. Answer: Materials which have been properly treated with
flame-retardants will not undergo pyrolysis andfor this reason will not
ignite.
