7. What is the primary chemical compound produced during incomplete
combustion that poses a significant health risk?
• Answer: Carbon monoxide (CO)
8. What is the difference between a deflagration and a detonation?
• Answer: A deflagration is subsonic combustion propagating through heat
transfer, while a detonation is supersonic combustion propagating
through shock compression
400 QUESTIONS AND ANSWERS 9. What is the primary extinguishing mechanism when using water on a
Class A fire?
• Answer: Cooling
1. What are the four components of the fire tetrahedron?
10. What are pyrolysis products? - Answer: Combustible gases released when
• Answer: Fuel, Heat, Oxygen, and Chemical Chain Reaction a solid fuel is heated
2. What is the process called when a solid changes directly to a gas without 11. What defines a Class B fire? - Answer: Fires involving flammable liquids
passing through a liquid phase? or gases
• Answer: Sublimation 12. What is the auto-ignition temperature? - Answer: The minimum
temperature at which a substance will spontaneously ignite without an external
3. What is the primary mechanism of heat transfer responsible for pre- ignition source
heating fuels above a fire?
13. What is the difference between fire point and flash point? - Answer:
• Answer: Convection Flash point is the temperature at which vapors will briefly ignite when exposed
to an ignition source, while fire point is the temperature at which vapors will
4. At what temperature (Fahrenheit) does ordinary combustible material sustain combustion after the ignition source is removed
typically ignite?
14. What gas is most commonly used in fire suppression systems that
• Answer: 500°F (260°C) operate by displacing oxygen? - Answer: Carbon dioxide (CO₂)
5. What is the minimum oxygen concentration typically required to 15. What does BLEVE stand for in fire science? - Answer: Boiling Liquid
support flaming combustion? Expanding Vapor Explosion
• Answer: 16% 16. What is meant by the term "fire load" in a building? - Answer: The total
amount of combustible materials in a space, including furniture, building
6. What term describes the temperature at which a liquid gives off enough materials, and contents, expressed in terms of heat release potential
vapor to form an ignitable mixture with air?
17. What is backdraft? - Answer: A dangerous explosion that occurs when
• Answer: Flash point oxygen is introduced to a fire that has consumed most of the available oxygen in
an enclosed space
,18. What does the term "rollover" describe in fire behavior? - Answer: The 30. What is a dry pipe sprinkler system? - Answer: A system where pipes are
ignition of combustible gases that have accumulated at the ceiling level filled with pressurized air or nitrogen until a sprinkler activates, then water
flows into the system
19. What is the fire growth rate generally described during the initial
stages of a fire? - Answer: Exponential growth (follows a t² curve) 31. What is the primary advantage of a pre-action sprinkler system? -
Answer: It reduces the risk of accidental water discharge by requiring separate
20. What is flame over (or flashover)? - Answer: The near-simultaneous detection before the pipes fill with water
ignition of all combustible materials in an enclosed area when the temperature
reaches a critical point 32. What is a water motor gong used for in a sprinkler system? - Answer: It
provides an audible alarm when water is flowing in the system
21. Which chemical compound is primarily responsible for the chemical
chain reaction in the fire tetrahedron? - Answer: Free radicals (primarily 33. What is the minimum required water supply duration for a sprinkler
hydroxyl radicals) system in an ordinary hazard occupancy according to NFPA 13? - Answer:
60-90 minutes
22. What is the primary hazard associated with lightweight construction in
fires? - Answer: Early structural collapse due to rapid failure of lightweight 34. What is the purpose of a pressure reducing valve in a standpipe system?
components when exposed to fire - Answer: To limit the pressure at fire hose outlets to a maximum of 175 psi
23. What is the principle behind how halogenated agents extinguish fires? - 35. What is the difference between a Class I and Class II standpipe? -
Answer: They interrupt the chemical chain reaction of combustion Answer: Class I standpipes have 2½-inch hose connections for fire department
use, while Class II standpipes have 1½-inch hose stations for occupant use
24. What is the relationship between temperature and relative humidity in
a fire environment? - Answer: As temperature increases, relative humidity 36. What is the maximum spacing between hangers on horizontal steel pipe
decreases, which increases fire risk and intensity with a 2-inch diameter? - Answer: 12 feet
25. What fuel characteristic describes how quickly a fire will spread across 37. What is the difference between a wet and dry standpipe system? -
its surface? - Answer: Flame spread rating Answer: Wet standpipes are constantly filled with water under pressure, while
dry standpipes are filled with water by the fire department when needed
SECTION 2: WATER-BASED FIRE PROTECTION SYSTEMS
(Questions 26-60) 38. What minimum flow rate is required for a Class I standpipe system? -
Answer: 500 GPM for the first standpipe and 250 GPM for each additional
26. What is the primary purpose of a fire department connection (FDC) on standpipe, up to a maximum of 1,250 GPM
a sprinkler system? - Answer: To allow the fire department to supplement the
water supply to the sprinkler system 39. What is a deluge system? - Answer: A system with open sprinklers where
water flow is controlled by a deluge valve that is activated by a detection system
27. What is the standard spacing for standard-response sprinklers in a light
hazard occupancy? - Answer: Maximum 15 feet between sprinklers and 7.5 40. What does the C-factor represent in hydraulic calculations? - Answer:
feet from walls The coefficient of roughness of the pipe interior
28. What is the maximum floor area coverage allowed for a single sprinkler 41. What is a gridded sprinkler system? - Answer: A system where multiple
in a light hazard occupancy? - Answer: 225 square feet cross mains are interconnected, creating a grid pattern that provides multiple
flow paths to any sprinkler
29. What color is the glass bulb of a sprinkler head rated at 155°F? -
Answer: Red
, 42. What is the minimum required pressure at the hydraulically most while a looped system provides multiple paths for water to flow by connecting
remote 1½-inch hose connection on a Class II standpipe? - Answer: 65 psi the ends of branch lines
43. What is a fire pump test header used for? - Answer: To test the fire 55. What is a pressure maintenance pump (jockey pump) used for? -
pump's performance by flowing water to the atmosphere Answer: To maintain pressure in the system and prevent the main fire pump
from cycling due to small pressure fluctuations
44. What is the minimum vertical clearance required below sprinklers? -
Answer: 18 inches 56. What does ESFR stand for in sprinkler systems? - Answer: Early
Suppression Fast Response
45. What type of water supply is appropriate for a dry chemical system
protecting a kitchen hood? - Answer: None; dry chemical systems do not use 57. What is the purpose of a check valve in a sprinkler system? - Answer:
water To allow water flow in one direction only
46. What color is the glass bulb in a quick-response sprinkler with a 58. What is a FDC sign required to indicate? - Answer: The portion of the
temperature rating of 135°F? - Answer: Orange building or systems served by the connection
47. What is the maximum height of a standard spray sprinkler installation 59. What is the difference between density and design area in sprinkler
in accordance with NFPA 13? - Answer: Generally 400 square feet per hydraulic calculations? - Answer: Density is the water application rate
sprinkler in non-storage applications (gpm/ft²), while design area is the area over which that density must be applied
48. What is a sprinkler system riser? - Answer: The vertical pipe that supplies 60. What is the appropriate NFPA standard for the installation of sprinkler
water to the system from the main systems? - Answer: NFPA 13
49. What is the purpose of an inspector's test connection in a sprinkler SECTION 3: SPECIAL HAZARD FIRE PROTECTION SYSTEMS
system? - Answer: To test the alarm devices and verify proper water flow in the (Questions 61-90)
system
61. What type of fire extinguishing agent is FM-200? - Answer: Clean agent
50. What is the primary function of a backflow preventer in a fire (heptafluoropropane)
protection system? - Answer: To prevent contamination of the public water
supply from water in the fire protection system 62. What is the primary extinguishing mechanism of carbon dioxide
systems? - Answer: Oxygen displacement (reduction of oxygen concentration)
51. What is the minimum duration of water supply required for a high-rise
building standpipe system? - Answer: 30 minutes 63. What is the main advantage of water mist systems over traditional
sprinkler systems? - Answer: They use significantly less water and can be
52. What is the purpose of a fire department pumper connection on a dry more effective on certain hazards
standpipe? - Answer: To allow the fire department to supply water to the
standpipe system 64. What type of detection system is most appropriate for a computer
server room? - Answer: Very Early Smoke Detection Apparatus (VESDA) or
53. What is antifreeze solution used for in sprinkler systems? - Answer: To air sampling detection
prevent freezing in small sections exposed to freezing temperatures
65. What is the maximum storage height for Class III commodities
54. What is the difference between a tree system and a looped system? - protected by ESFR sprinklers? - Answer: Up to 40 feet depending on the
Answer: A tree system branches out like a tree from the riser with dead ends, specific design criteria
combustion that poses a significant health risk?
• Answer: Carbon monoxide (CO)
8. What is the difference between a deflagration and a detonation?
• Answer: A deflagration is subsonic combustion propagating through heat
transfer, while a detonation is supersonic combustion propagating
through shock compression
400 QUESTIONS AND ANSWERS 9. What is the primary extinguishing mechanism when using water on a
Class A fire?
• Answer: Cooling
1. What are the four components of the fire tetrahedron?
10. What are pyrolysis products? - Answer: Combustible gases released when
• Answer: Fuel, Heat, Oxygen, and Chemical Chain Reaction a solid fuel is heated
2. What is the process called when a solid changes directly to a gas without 11. What defines a Class B fire? - Answer: Fires involving flammable liquids
passing through a liquid phase? or gases
• Answer: Sublimation 12. What is the auto-ignition temperature? - Answer: The minimum
temperature at which a substance will spontaneously ignite without an external
3. What is the primary mechanism of heat transfer responsible for pre- ignition source
heating fuels above a fire?
13. What is the difference between fire point and flash point? - Answer:
• Answer: Convection Flash point is the temperature at which vapors will briefly ignite when exposed
to an ignition source, while fire point is the temperature at which vapors will
4. At what temperature (Fahrenheit) does ordinary combustible material sustain combustion after the ignition source is removed
typically ignite?
14. What gas is most commonly used in fire suppression systems that
• Answer: 500°F (260°C) operate by displacing oxygen? - Answer: Carbon dioxide (CO₂)
5. What is the minimum oxygen concentration typically required to 15. What does BLEVE stand for in fire science? - Answer: Boiling Liquid
support flaming combustion? Expanding Vapor Explosion
• Answer: 16% 16. What is meant by the term "fire load" in a building? - Answer: The total
amount of combustible materials in a space, including furniture, building
6. What term describes the temperature at which a liquid gives off enough materials, and contents, expressed in terms of heat release potential
vapor to form an ignitable mixture with air?
17. What is backdraft? - Answer: A dangerous explosion that occurs when
• Answer: Flash point oxygen is introduced to a fire that has consumed most of the available oxygen in
an enclosed space
,18. What does the term "rollover" describe in fire behavior? - Answer: The 30. What is a dry pipe sprinkler system? - Answer: A system where pipes are
ignition of combustible gases that have accumulated at the ceiling level filled with pressurized air or nitrogen until a sprinkler activates, then water
flows into the system
19. What is the fire growth rate generally described during the initial
stages of a fire? - Answer: Exponential growth (follows a t² curve) 31. What is the primary advantage of a pre-action sprinkler system? -
Answer: It reduces the risk of accidental water discharge by requiring separate
20. What is flame over (or flashover)? - Answer: The near-simultaneous detection before the pipes fill with water
ignition of all combustible materials in an enclosed area when the temperature
reaches a critical point 32. What is a water motor gong used for in a sprinkler system? - Answer: It
provides an audible alarm when water is flowing in the system
21. Which chemical compound is primarily responsible for the chemical
chain reaction in the fire tetrahedron? - Answer: Free radicals (primarily 33. What is the minimum required water supply duration for a sprinkler
hydroxyl radicals) system in an ordinary hazard occupancy according to NFPA 13? - Answer:
60-90 minutes
22. What is the primary hazard associated with lightweight construction in
fires? - Answer: Early structural collapse due to rapid failure of lightweight 34. What is the purpose of a pressure reducing valve in a standpipe system?
components when exposed to fire - Answer: To limit the pressure at fire hose outlets to a maximum of 175 psi
23. What is the principle behind how halogenated agents extinguish fires? - 35. What is the difference between a Class I and Class II standpipe? -
Answer: They interrupt the chemical chain reaction of combustion Answer: Class I standpipes have 2½-inch hose connections for fire department
use, while Class II standpipes have 1½-inch hose stations for occupant use
24. What is the relationship between temperature and relative humidity in
a fire environment? - Answer: As temperature increases, relative humidity 36. What is the maximum spacing between hangers on horizontal steel pipe
decreases, which increases fire risk and intensity with a 2-inch diameter? - Answer: 12 feet
25. What fuel characteristic describes how quickly a fire will spread across 37. What is the difference between a wet and dry standpipe system? -
its surface? - Answer: Flame spread rating Answer: Wet standpipes are constantly filled with water under pressure, while
dry standpipes are filled with water by the fire department when needed
SECTION 2: WATER-BASED FIRE PROTECTION SYSTEMS
(Questions 26-60) 38. What minimum flow rate is required for a Class I standpipe system? -
Answer: 500 GPM for the first standpipe and 250 GPM for each additional
26. What is the primary purpose of a fire department connection (FDC) on standpipe, up to a maximum of 1,250 GPM
a sprinkler system? - Answer: To allow the fire department to supplement the
water supply to the sprinkler system 39. What is a deluge system? - Answer: A system with open sprinklers where
water flow is controlled by a deluge valve that is activated by a detection system
27. What is the standard spacing for standard-response sprinklers in a light
hazard occupancy? - Answer: Maximum 15 feet between sprinklers and 7.5 40. What does the C-factor represent in hydraulic calculations? - Answer:
feet from walls The coefficient of roughness of the pipe interior
28. What is the maximum floor area coverage allowed for a single sprinkler 41. What is a gridded sprinkler system? - Answer: A system where multiple
in a light hazard occupancy? - Answer: 225 square feet cross mains are interconnected, creating a grid pattern that provides multiple
flow paths to any sprinkler
29. What color is the glass bulb of a sprinkler head rated at 155°F? -
Answer: Red
, 42. What is the minimum required pressure at the hydraulically most while a looped system provides multiple paths for water to flow by connecting
remote 1½-inch hose connection on a Class II standpipe? - Answer: 65 psi the ends of branch lines
43. What is a fire pump test header used for? - Answer: To test the fire 55. What is a pressure maintenance pump (jockey pump) used for? -
pump's performance by flowing water to the atmosphere Answer: To maintain pressure in the system and prevent the main fire pump
from cycling due to small pressure fluctuations
44. What is the minimum vertical clearance required below sprinklers? -
Answer: 18 inches 56. What does ESFR stand for in sprinkler systems? - Answer: Early
Suppression Fast Response
45. What type of water supply is appropriate for a dry chemical system
protecting a kitchen hood? - Answer: None; dry chemical systems do not use 57. What is the purpose of a check valve in a sprinkler system? - Answer:
water To allow water flow in one direction only
46. What color is the glass bulb in a quick-response sprinkler with a 58. What is a FDC sign required to indicate? - Answer: The portion of the
temperature rating of 135°F? - Answer: Orange building or systems served by the connection
47. What is the maximum height of a standard spray sprinkler installation 59. What is the difference between density and design area in sprinkler
in accordance with NFPA 13? - Answer: Generally 400 square feet per hydraulic calculations? - Answer: Density is the water application rate
sprinkler in non-storage applications (gpm/ft²), while design area is the area over which that density must be applied
48. What is a sprinkler system riser? - Answer: The vertical pipe that supplies 60. What is the appropriate NFPA standard for the installation of sprinkler
water to the system from the main systems? - Answer: NFPA 13
49. What is the purpose of an inspector's test connection in a sprinkler SECTION 3: SPECIAL HAZARD FIRE PROTECTION SYSTEMS
system? - Answer: To test the alarm devices and verify proper water flow in the (Questions 61-90)
system
61. What type of fire extinguishing agent is FM-200? - Answer: Clean agent
50. What is the primary function of a backflow preventer in a fire (heptafluoropropane)
protection system? - Answer: To prevent contamination of the public water
supply from water in the fire protection system 62. What is the primary extinguishing mechanism of carbon dioxide
systems? - Answer: Oxygen displacement (reduction of oxygen concentration)
51. What is the minimum duration of water supply required for a high-rise
building standpipe system? - Answer: 30 minutes 63. What is the main advantage of water mist systems over traditional
sprinkler systems? - Answer: They use significantly less water and can be
52. What is the purpose of a fire department pumper connection on a dry more effective on certain hazards
standpipe? - Answer: To allow the fire department to supply water to the
standpipe system 64. What type of detection system is most appropriate for a computer
server room? - Answer: Very Early Smoke Detection Apparatus (VESDA) or
53. What is antifreeze solution used for in sprinkler systems? - Answer: To air sampling detection
prevent freezing in small sections exposed to freezing temperatures
65. What is the maximum storage height for Class III commodities
54. What is the difference between a tree system and a looped system? - protected by ESFR sprinklers? - Answer: Up to 40 feet depending on the
Answer: A tree system branches out like a tree from the riser with dead ends, specific design criteria
