1. Q: What are the three elements required for fire to exist? ANSWER
Heat, fuel, and oxygen (the fire triangle).
2. Q: What is the fourth element added to create the fire tetrahedron?
ANSWER Chemical chain reaction.
3. Q: At what temperature does paper typically ignite? ANSWER
Approximately 451°F (233°C).
4. Q: What is the definition of combustion? ANSWER A rapid chemical
reaction between a fuel and oxygen that produces heat and light.
5. Q: What is the difference between complete and incomplete combustion?
ANSWER Complete combustion produces CO₂ and water; incomplete
combustion produces toxic gases like carbon monoxide.
6. Q: What is the flash point of a liquid? ANSWER The lowest temperature
at which a liquid gives off enough vapor to form an ignitable mixture with air.
7. Q: What is the fire point of a liquid? ANSWER The temperature at which
a liquid continues to burn after ignition.
8. Q: What is spontaneous combustion? ANSWER The ignition of materials
without an external heat source due to internal chemical reactions.
9. Q: What is the lower explosive limit (LEL)? ANSWER The minimum
concentration of vapor in air below which propagation of flame does not occur.
10. Q: What is the upper explosive limit (UEL)? ANSWER The maximum
concentration of vapor in air above which propagation of flame does not occur.
11. Q: What are the four methods of heat transfer? ANSWER Conduction,
convection, radiation, and direct flame contact.
12. Q: Define conduction in fire spread. ANSWER Heat transfer through
direct contact between materials.
13. Q: Define convection in fire spread. ANSWER Heat transfer through the
movement of heated gases and liquids.
,14. Q: Define radiation in fire spread. ANSWER Heat transfer through
electromagnetic waves without direct contact.
15. Q: What is pyrolysis? ANSWER The chemical decomposition of
materials by heat, producing flammable gases.
16. Q: What temperature range is considered high heat for firefighting
purposes? ANSWER Above 200°F (93°C).
17. Q: What is backdraft? ANSWER A sudden explosion that occurs when
oxygen is introduced to a fire that has consumed most available oxygen.
18. Q: What is flashover? ANSWER The rapid transition from a localized fire
to full room involvement.
19. Q: What is rollover? ANSWER The ignition of unburned gases at the
ceiling level during a fire.
20. Q: What percentage of oxygen is normally present in air? ANSWER
Approximately 21%.
21. Q: At what oxygen concentration will most fires self-extinguish?
ANSWER Below 16%.
22. Q: What is the ignition temperature of wood? ANSWER Approximately
500-700°F (260-371°C) depending on the type.
23. Q: What is meant by "fuel load"? ANSWER The amount of combustible
materials in a given area.
24. Q: What is the relationship between surface area and burning rate?
ANSWER Increased surface area leads to faster burning rates.
25. Q: What is thermal decomposition? ANSWER The breakdown of
materials due to heat exposure.
26. Q: What gases are commonly produced during fires? ANSWER Carbon
monoxide, carbon dioxide, hydrogen cyanide, and various toxic compounds.
27. Q: Why is carbon monoxide particularly dangerous? ANSWER It binds
to hemoglobin 200 times more readily than oxygen, causing asphyxiation.
28. Q: What is the specific gravity of most hydrocarbon vapors? ANSWER
Heavier than air (specific gravity >1).
29. Q: What happens to the density of air as it heats up? ANSWER Hot air
becomes less dense and rises.
, 30. Q: What is the difference between flame spread and fire spread?
ANSWER Flame spread is surface burning; fire spread includes all methods of
fire extension.
31. Q: What is the piloted ignition temperature? ANSWER The temperature
at which a material ignites with an external ignition source.
32. Q: What is the auto-ignition temperature? ANSWER The temperature at
which a material ignites spontaneously without an external source.
33. Q: How does moisture content affect combustibility? ANSWER Higher
moisture content reduces combustibility by requiring more energy to vaporize
water.
34. Q: What is the critical temperature for structural steel failure?
ANSWER Approximately 1000°F (538°C).
35. Q: What happens to concrete in high temperatures? ANSWER It can
crack, spall, and lose structural integrity due to moisture expansion.
36. Q: What is the difference between endothermic and exothermic
reactions? ANSWER Endothermic absorbs heat; exothermic releases heat.
37. Q: What is the most common cause of fire spread in buildings?
ANSWER Hot gases and smoke movement through openings.
38. Q: What is meant by "free-burning" phase of fire? ANSWER The
period when adequate oxygen is available for complete combustion.
39. Q: What occurs during the decay phase of fire? ANSWER Fire intensity
decreases due to fuel consumption or oxygen depletion.
40. Q: What is the relationship between ventilation and fire behavior?
ANSWER Increased ventilation generally increases fire intensity and spread
rate.
41. Q: What is a BLEVE? ANSWER Boiling Liquid Expanding Vapor
Explosion - occurs when a pressurized liquid container fails.
42. Q: What is the stack effect in buildings? ANSWER The movement of air
through buildings due to temperature differences between inside and outside.
43. Q: How does humidity affect fire behavior? ANSWER Higher humidity
can slow fire spread by increasing the energy required to evaporate moisture.
44. Q: What is the compartment fire effect? ANSWER Fire behavior
influenced by the size and ventilation of the space where it occurs.
Heat, fuel, and oxygen (the fire triangle).
2. Q: What is the fourth element added to create the fire tetrahedron?
ANSWER Chemical chain reaction.
3. Q: At what temperature does paper typically ignite? ANSWER
Approximately 451°F (233°C).
4. Q: What is the definition of combustion? ANSWER A rapid chemical
reaction between a fuel and oxygen that produces heat and light.
5. Q: What is the difference between complete and incomplete combustion?
ANSWER Complete combustion produces CO₂ and water; incomplete
combustion produces toxic gases like carbon monoxide.
6. Q: What is the flash point of a liquid? ANSWER The lowest temperature
at which a liquid gives off enough vapor to form an ignitable mixture with air.
7. Q: What is the fire point of a liquid? ANSWER The temperature at which
a liquid continues to burn after ignition.
8. Q: What is spontaneous combustion? ANSWER The ignition of materials
without an external heat source due to internal chemical reactions.
9. Q: What is the lower explosive limit (LEL)? ANSWER The minimum
concentration of vapor in air below which propagation of flame does not occur.
10. Q: What is the upper explosive limit (UEL)? ANSWER The maximum
concentration of vapor in air above which propagation of flame does not occur.
11. Q: What are the four methods of heat transfer? ANSWER Conduction,
convection, radiation, and direct flame contact.
12. Q: Define conduction in fire spread. ANSWER Heat transfer through
direct contact between materials.
13. Q: Define convection in fire spread. ANSWER Heat transfer through the
movement of heated gases and liquids.
,14. Q: Define radiation in fire spread. ANSWER Heat transfer through
electromagnetic waves without direct contact.
15. Q: What is pyrolysis? ANSWER The chemical decomposition of
materials by heat, producing flammable gases.
16. Q: What temperature range is considered high heat for firefighting
purposes? ANSWER Above 200°F (93°C).
17. Q: What is backdraft? ANSWER A sudden explosion that occurs when
oxygen is introduced to a fire that has consumed most available oxygen.
18. Q: What is flashover? ANSWER The rapid transition from a localized fire
to full room involvement.
19. Q: What is rollover? ANSWER The ignition of unburned gases at the
ceiling level during a fire.
20. Q: What percentage of oxygen is normally present in air? ANSWER
Approximately 21%.
21. Q: At what oxygen concentration will most fires self-extinguish?
ANSWER Below 16%.
22. Q: What is the ignition temperature of wood? ANSWER Approximately
500-700°F (260-371°C) depending on the type.
23. Q: What is meant by "fuel load"? ANSWER The amount of combustible
materials in a given area.
24. Q: What is the relationship between surface area and burning rate?
ANSWER Increased surface area leads to faster burning rates.
25. Q: What is thermal decomposition? ANSWER The breakdown of
materials due to heat exposure.
26. Q: What gases are commonly produced during fires? ANSWER Carbon
monoxide, carbon dioxide, hydrogen cyanide, and various toxic compounds.
27. Q: Why is carbon monoxide particularly dangerous? ANSWER It binds
to hemoglobin 200 times more readily than oxygen, causing asphyxiation.
28. Q: What is the specific gravity of most hydrocarbon vapors? ANSWER
Heavier than air (specific gravity >1).
29. Q: What happens to the density of air as it heats up? ANSWER Hot air
becomes less dense and rises.
, 30. Q: What is the difference between flame spread and fire spread?
ANSWER Flame spread is surface burning; fire spread includes all methods of
fire extension.
31. Q: What is the piloted ignition temperature? ANSWER The temperature
at which a material ignites with an external ignition source.
32. Q: What is the auto-ignition temperature? ANSWER The temperature at
which a material ignites spontaneously without an external source.
33. Q: How does moisture content affect combustibility? ANSWER Higher
moisture content reduces combustibility by requiring more energy to vaporize
water.
34. Q: What is the critical temperature for structural steel failure?
ANSWER Approximately 1000°F (538°C).
35. Q: What happens to concrete in high temperatures? ANSWER It can
crack, spall, and lose structural integrity due to moisture expansion.
36. Q: What is the difference between endothermic and exothermic
reactions? ANSWER Endothermic absorbs heat; exothermic releases heat.
37. Q: What is the most common cause of fire spread in buildings?
ANSWER Hot gases and smoke movement through openings.
38. Q: What is meant by "free-burning" phase of fire? ANSWER The
period when adequate oxygen is available for complete combustion.
39. Q: What occurs during the decay phase of fire? ANSWER Fire intensity
decreases due to fuel consumption or oxygen depletion.
40. Q: What is the relationship between ventilation and fire behavior?
ANSWER Increased ventilation generally increases fire intensity and spread
rate.
41. Q: What is a BLEVE? ANSWER Boiling Liquid Expanding Vapor
Explosion - occurs when a pressurized liquid container fails.
42. Q: What is the stack effect in buildings? ANSWER The movement of air
through buildings due to temperature differences between inside and outside.
43. Q: How does humidity affect fire behavior? ANSWER Higher humidity
can slow fire spread by increasing the energy required to evaporate moisture.
44. Q: What is the compartment fire effect? ANSWER Fire behavior
influenced by the size and ventilation of the space where it occurs.
