NC FIT FIRE INVESTIGATION TECHNICIAN NEWLY UPDATED COLLECTION
OF EXAM QUESTIONS AND VERIFIED ANSWERS DESIGNED TO
GUARANTEE YOUR SUCCESS ON THE LATEST TEST VERSION
1. Q: What is the fire triangle? ANSWER The three elements required for
combustion: fuel, heat, and oxygen.
2. Q: What is the fire tetrahedron? ANSWER The four elements
required for sustained combustion: fuel, heat, oxygen, and chemical chain
reaction.
3. Q: What is flashover? ANSWER The transition phase when all
combustible materials in a compartment ignite nearly simultaneously due
to radiant heat buildup.
4. Q: Define autoignition temperature. ANSWER The minimum
temperature at which a substance will spontaneously ignite without an
external ignition source.
5. Q: What is pyrolysis? ANSWER The chemical decomposition of a
material due to heat, producing flammable gases and vapors.
6. Q: What is the lower explosive limit (LEL)? ANSWER The minimum
concentration of fuel vapor in air below which combustion cannot occur.
7. Q: What is the upper explosive limit (UEL)? ANSWER The
maximum concentration of fuel vapor in air above which combustion
cannot occur due to insufficient oxygen.
8. Q: What is backdraft? ANSWER An explosive fire event that occurs
when oxygen is suddenly introduced to a ventilation-limited, smoldering
fire.
9. Q: Define heat release rate (HRR). ANSWER The amount of heat
energy released per unit time during combustion, typically measured in
kilowatts or megawatts.
,10.Q: What is convection in fire dynamics? ANSWER Heat transfer
through the movement of hot gases and air currents.
11.Q: What is conduction heat transfer? ANSWER Heat transfer through
direct contact between materials or through solid materials.
12.Q: What is radiation heat transfer? ANSWER Heat transfer through
electromagnetic waves without requiring a medium.
13.Q: What is a Class A fire? ANSWER A fire involving ordinary
combustible materials such as wood, paper, cloth, and plastics.
14.Q: What is a Class B fire? ANSWER A fire involving flammable
liquids and gases such as gasoline, oil, propane, and butane.
15.Q: What is a Class C fire? ANSWER A fire involving energized
electrical equipment.
16.Q: What is a Class D fire? ANSWER A fire involving combustible
metals such as magnesium, titanium, or sodium.
17.Q: What is a Class K fire? ANSWER A fire involving cooking oils and
fats, typically found in commercial kitchens.
18.Q: What are fire patterns? ANSWER Visible or measurable physical
changes produced by fire on materials and surfaces.
19.Q: What is a V-pattern? ANSWER A fire pattern typically indicating
upward fire spread, with the point of origin at the base of the V.
20.Q: What causes thermal layering in structure fires? ANSWER Hot
gases rise and accumulate at the ceiling level while cooler air remains
near the floor due to density differences.
21.Q: What is flame impingement? ANSWER Direct contact of flames
with a surface, causing localized burning and damage.
22.Q: What is ventilation-controlled fire? ANSWER A fire where the
burning rate is limited by the available oxygen supply.
23.Q: What is fuel-controlled fire? ANSWER A fire where the burning
rate is limited by the available fuel rather than oxygen.
24.Q: What is spontaneous ignition? ANSWER Ignition resulting from
heat buildup within a material without external flame or spark.
25.Q: What is piloted ignition? ANSWER Ignition requiring an external
ignition source such as a flame or spark.
, 26.Q: What is smoldering combustion? ANSWER Slow, low-
temperature, flameless combustion of a solid fuel.
27.Q: What is flaming combustion? ANSWER Rapid, high-temperature
combustion characterized by visible flames.
28.Q: What is thermal inertia? ANSWER A material's resistance to
temperature change, affecting how quickly it heats up or cools down.
29.Q: What is heat flux? ANSWER The rate of heat energy transfer
through a surface, measured in kilowatts per square meter.
30.Q: What causes clean burn patterns? ANSWER Intense localized
burning that removes soot and residue from surfaces.
31.Q: What is ghosting? ANSWER Soot patterns on walls that outline
previously present objects or furniture.
32.Q: What is spalling? ANSWER The breaking, chipping, or flaking of
concrete surfaces due to rapid heating.
33.Q: What is calcination? ANSWER The breakdown of gypsum
wallboard into powder due to heat exposure.
34.Q: What is annealing? ANSWER The softening of glass or metal due
to heat exposure without melting.
35.Q: What is oxidation? ANSWER A chemical reaction between fuel and
oxygen during combustion.
36.Q: What are combustion byproducts? ANSWER Products resulting
from burning, including carbon dioxide, carbon monoxide, water vapor,
and soot.
37.Q: What is carbon monoxide? ANSWER A toxic, colorless, odorless
gas produced by incomplete combustion.
38.Q: What is incomplete combustion? ANSWER Combustion that
occurs with insufficient oxygen, producing carbon monoxide and soot.
39.Q: What is complete combustion? ANSWER Combustion with
sufficient oxygen, producing primarily carbon dioxide and water vapor.
40.Q: What is fire load? ANSWER The total quantity of combustible
materials in a space, typically measured in pounds per square foot.
41.Q: What is surface-to-mass ratio? ANSWER The ratio of a material's
surface area to its mass, affecting ignition ease.
OF EXAM QUESTIONS AND VERIFIED ANSWERS DESIGNED TO
GUARANTEE YOUR SUCCESS ON THE LATEST TEST VERSION
1. Q: What is the fire triangle? ANSWER The three elements required for
combustion: fuel, heat, and oxygen.
2. Q: What is the fire tetrahedron? ANSWER The four elements
required for sustained combustion: fuel, heat, oxygen, and chemical chain
reaction.
3. Q: What is flashover? ANSWER The transition phase when all
combustible materials in a compartment ignite nearly simultaneously due
to radiant heat buildup.
4. Q: Define autoignition temperature. ANSWER The minimum
temperature at which a substance will spontaneously ignite without an
external ignition source.
5. Q: What is pyrolysis? ANSWER The chemical decomposition of a
material due to heat, producing flammable gases and vapors.
6. Q: What is the lower explosive limit (LEL)? ANSWER The minimum
concentration of fuel vapor in air below which combustion cannot occur.
7. Q: What is the upper explosive limit (UEL)? ANSWER The
maximum concentration of fuel vapor in air above which combustion
cannot occur due to insufficient oxygen.
8. Q: What is backdraft? ANSWER An explosive fire event that occurs
when oxygen is suddenly introduced to a ventilation-limited, smoldering
fire.
9. Q: Define heat release rate (HRR). ANSWER The amount of heat
energy released per unit time during combustion, typically measured in
kilowatts or megawatts.
,10.Q: What is convection in fire dynamics? ANSWER Heat transfer
through the movement of hot gases and air currents.
11.Q: What is conduction heat transfer? ANSWER Heat transfer through
direct contact between materials or through solid materials.
12.Q: What is radiation heat transfer? ANSWER Heat transfer through
electromagnetic waves without requiring a medium.
13.Q: What is a Class A fire? ANSWER A fire involving ordinary
combustible materials such as wood, paper, cloth, and plastics.
14.Q: What is a Class B fire? ANSWER A fire involving flammable
liquids and gases such as gasoline, oil, propane, and butane.
15.Q: What is a Class C fire? ANSWER A fire involving energized
electrical equipment.
16.Q: What is a Class D fire? ANSWER A fire involving combustible
metals such as magnesium, titanium, or sodium.
17.Q: What is a Class K fire? ANSWER A fire involving cooking oils and
fats, typically found in commercial kitchens.
18.Q: What are fire patterns? ANSWER Visible or measurable physical
changes produced by fire on materials and surfaces.
19.Q: What is a V-pattern? ANSWER A fire pattern typically indicating
upward fire spread, with the point of origin at the base of the V.
20.Q: What causes thermal layering in structure fires? ANSWER Hot
gases rise and accumulate at the ceiling level while cooler air remains
near the floor due to density differences.
21.Q: What is flame impingement? ANSWER Direct contact of flames
with a surface, causing localized burning and damage.
22.Q: What is ventilation-controlled fire? ANSWER A fire where the
burning rate is limited by the available oxygen supply.
23.Q: What is fuel-controlled fire? ANSWER A fire where the burning
rate is limited by the available fuel rather than oxygen.
24.Q: What is spontaneous ignition? ANSWER Ignition resulting from
heat buildup within a material without external flame or spark.
25.Q: What is piloted ignition? ANSWER Ignition requiring an external
ignition source such as a flame or spark.
, 26.Q: What is smoldering combustion? ANSWER Slow, low-
temperature, flameless combustion of a solid fuel.
27.Q: What is flaming combustion? ANSWER Rapid, high-temperature
combustion characterized by visible flames.
28.Q: What is thermal inertia? ANSWER A material's resistance to
temperature change, affecting how quickly it heats up or cools down.
29.Q: What is heat flux? ANSWER The rate of heat energy transfer
through a surface, measured in kilowatts per square meter.
30.Q: What causes clean burn patterns? ANSWER Intense localized
burning that removes soot and residue from surfaces.
31.Q: What is ghosting? ANSWER Soot patterns on walls that outline
previously present objects or furniture.
32.Q: What is spalling? ANSWER The breaking, chipping, or flaking of
concrete surfaces due to rapid heating.
33.Q: What is calcination? ANSWER The breakdown of gypsum
wallboard into powder due to heat exposure.
34.Q: What is annealing? ANSWER The softening of glass or metal due
to heat exposure without melting.
35.Q: What is oxidation? ANSWER A chemical reaction between fuel and
oxygen during combustion.
36.Q: What are combustion byproducts? ANSWER Products resulting
from burning, including carbon dioxide, carbon monoxide, water vapor,
and soot.
37.Q: What is carbon monoxide? ANSWER A toxic, colorless, odorless
gas produced by incomplete combustion.
38.Q: What is incomplete combustion? ANSWER Combustion that
occurs with insufficient oxygen, producing carbon monoxide and soot.
39.Q: What is complete combustion? ANSWER Combustion with
sufficient oxygen, producing primarily carbon dioxide and water vapor.
40.Q: What is fire load? ANSWER The total quantity of combustible
materials in a space, typically measured in pounds per square foot.
41.Q: What is surface-to-mass ratio? ANSWER The ratio of a material's
surface area to its mass, affecting ignition ease.
