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NEW QUESTION # 62
Which NFPA Standard provides requirements for the storage and handling of aluminum powders, flakes, and pastes?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
Explanation
NFPA 484: Standard for Combustible Metals, 2020 Edition, provides requirements for the storage and handling of aluminum powders, flakes, and pastes. This standard covers the production, processing, finishing, handling, recycling, storage, and use of all metals and alloys that are in a form capable of combustion or explosion. It also covers operations where metal or metal alloys are subjected to processing or finishing operations that produce combustible powder or dust.NFPA 484 includes specific chapters for various metals and alloys, including aluminum and aluminum alloys12 References:
NFPA 484: Standard for Combustible Metals
NFPA 651: Standard for the Machining and Finishing of Aluminum and the ...
NEW QUESTION # 63
Which OSHA regulation addresses storage and handling of liquefied petroleum gas?
- A. 1910.108
- B. 1910.107
- C. 1910.110
- D. 1910.119
Answer: C
Explanation:
Explanation
OSHA regulation 1910.110 addresses storage and handling of liquefied petroleum gas (LPG). This regulation covers the general requirements for the design, construction, installation, operation, inspection, and maintenance of LPG systems, including containers, piping, valves, fittings, regulators, burners, and appliances.
The regulation also specifies the safety precautions and procedures for the prevention of fire and explosion hazards involving LPG. The regulation applies to all employers who store, handle, or use LPG in their workplaces.References:
OSHA: 1910.110 - Storage and handling of liquefied petroleum gases1
Nebula Safety: Storage & Handling of Liquefied Petroleum Gases (LPGs)2
NEW QUESTION # 64
The minimum width of a doorway in a means of egress to accommodate a person in a wheelchair is
- A. 40 inches (1016 mm).
- B. 36 inches (914 mm).
- C. 28 inches (711 mm).
- D. 32 inches (813 mm).
Answer: D
Explanation:
Explanation
The minimum width of a doorway in a means of egress to accommodate a person in a wheelchair is 32 inches (813 mm).This is based on the requirements of the Americans with Disabilities Act (ADA) and the International Building Code (IBC), which both specify that doors in a path of egress and doors on an accessible route must have a clear opening width of at least 32 inches (813 mm)12. This width allows enough space for a person in a wheelchair to maneuver through the doorway without difficulty. A wider doorway may be preferable for some types of wheelchairs or other assistive devices, but 32 inches (813 mm) is the minimum standard for accessibility and safety.References:DECODED: Calculating the Egress Width of Door Openings - I Dig Hardware;Digital Codes.
NEW QUESTION # 65
When using water mist as an extinguishing mechanism, the effectiveness of a fine mist depends on
- A. how much conductive heat the mist system will absorb.
- B. the momentum and direction of the spray relative to the fire.
- C. how much mist diverts to the compartment boundaries.
- D. the ability of the mist to directly spray on the fire.
Answer: B
Explanation:
Explanation
When using water mist as an extinguishing mechanism, the effectiveness of a fine mist depends on the momentum and direction of the spray relative to the fire. The momentum and direction of the spray determine how well the mist can penetrate the fire plume and reach the flame zone, where the mist droplets can evaporate and cool the fire, displace oxygen, and dilute the fuel vapors. The mist spray should have sufficient momentum to overcome the buoyancy and entrainment of the fire plume, and the direction of the spray should be aligned with the fire plume to avoid deflection and dispersion. The ability of the mist to directly spray on the fire, how much mist diverts to the compartment boundaries, and how much conductive heat the mist system will absorb are not the main factors affecting the extinguishing effectiveness of a fine mist.
References:Water Mist Systems Overview | NFPA;Engineering Relations for Water Mist Fire Suppression Systems;Effectiveness of Swirl Water Mist Nozzles for Fire Suppression
NEW QUESTION # 66
What is the maximum allowable sound pressure level (SPL) for a fire alarm system?
- A. 50 dBA
- B. 30 dBA
- C. 130 dBA
- D. 100 dBA
Answer: D
Explanation:
Explanation
According to NFPA 72, the maximum sound pressure level (SPL) for a fire alarm system is 110 dBA at the minimum hearing distance from the audible appliance1.However, this limit can be exceeded if the sound pressure level measured 2 000 mm above floor level is not more than 100 dBA2. Sound pressure level is a measure of the intensity of sound at a given point in space, expressed in decibels (dB). The higher the SPL, the louder the sound.For comparison, a normal conversation is about 60 dB, a jet engine is about 140 dB, and a gunshot is about 160 dB3.References:Sound Pressure Levels - NFPA;NFPA fire alarm sound level - EntirelySafe.com;Subsection 907.5 - Occupantnotification systems - Casetext;How Loud Is a Fire Alarm In Decibels (dB)? With Noise Comparison Chart;The Ontario Building Code | Audibility of Alarm Systems.
NEW QUESTION # 67
What is the occupancy factor used by the Insurance Services Office (ISO) for computing required fire flow for C-3 (Combustible)?
- A. 1.00
- B. 0.75
- C. 1.15
- D. 0.85
Answer: A
NEW QUESTION # 68
What type of standpipe system provides 21/2 in. (65 mm) hose connections at designated locations in a building for use by the fire department?
- A. Class III
- B. Class II
- C. Class I
- D. Class IV
Answer: C
Explanation:
Explanation
A Class I standpipe system provides 2 1/2 in. (65 mm) hose connections at designated locations in a building for use by the fire department. A Class I standpipe system is intended to supply water for fire fighting operations by trained personnel using hoses of 1 1/2 in. (40 mm), 1 3/4 in. (45 mm), or 2 in. (50 mm) nominal diameters. A Class I standpipe system is required to deliver a minimum flow rate of 250 gpm (946 L/min) at a minimum residual pressure of 100 psi (6.9 bar) at the most remote hose connection.References:
NFPA 14: Standard for the Installation of Standpipe and Hose Systems, 2019 Edition, Section 3.3.4.11 Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.2.1.12
NEW QUESTION # 69
What are the two classes of fire models?
- A. Behavioral and theoretical
- B. Open and closed
- C. Field and laboratory
- D. Physical and mathematical
Answer: D
Explanation:
Explanation
The two classes of fire models arephysical and mathematical. Physical fire models are scaled-down representations of real fire scenarios, using laboratory experiments and measurements to study the fire behavior and effects.Physical fire models can be used to test hypotheses, validate mathematical models, and provide empirical data for fire analysis1. Mathematical fire models are numerical or analytical solutions of the equations that govern the fire phenomena, such as heat transfer, fluid dynamics, combustion, and chemical kinetics.Mathematical fire models can be used to simulate fire scenarios, predict fire outcomes, and optimize fire protection systems2. There are two major categories of mathematical fire models: zone models and field models. Zone models divide the fire compartment into two or more homogeneous zones, such as upper and lower layers, and apply mass and energy conservation equations to each zone.Zone models are relatively simple, fast, and easy to use, but they have limitations in accuracy and applicability3. Field models solve the partial differential equations that describe the fire-driven fluid flow and heat transfer in three dimensions, using computational fluid dynamics (CFD) techniques.Field models are more detailed, realistic, and flexible, but they require more computational resources and expertise4.References:
Fire modelling with Computational Fluid Dynamics - BRE Group
Fire modeling programs | NIST
interFIRE, A site dedicated to improving fire investigation worldwide.
Computer Fire Models for Fire Investigation and Reconstruction
NEW QUESTION # 70
What is the limit per NFPA 30 for gross floor area in a hazardous material storage locker?
- A. 1500 ft2 (139 m2)
- B. 4500 ft2 (418 m2)
- C. 6000 ft2 (557 m2)
- D. 3000 ft2 (379 m2)
Answer: A
Explanation:
Explanation
The answer is A. According to NFPA 30: Flammable and Combustible Liquids Code, 2021 Edition, Chapter
14, lockers used for the storage of flammable or combustible liquids shall not exceed 1500 ft2 (139 m2) gross floor area. This limit applies to both indoor and outdoor lockers.Lockers are defined as self-contained, prefabricated structures that are designed to store hazardous materials and that are equipped with fire protection features, such as fire-resistance-rated walls, doors, and roofs, automatic sprinklers, spill containment, and ventilation12
NEW QUESTION # 71
What is the minimum pipe diameter size for direct discharge of steam inside a water tank?
- A. 1 in. (25 mm)
- B. 2 in. (50 mm)
- C. 1 1/2 in. (38 mm)
- D. 1/2 in. (13 mm)
Answer: B
Explanation:
Explanation
The minimum pipe diameter size for direct discharge of steam inside a water tank is 2 in. (50 mm), according to NFPA 13, Standard for the Installation of Sprinkler Systems. This is to prevent water hammer, noise, and vibration caused by the rapid condensation of steam when it contacts the water. The pipe should also be equipped with a check valve to prevent backflow of water into the steam source.References: NFPA 13, Standard for the Installation of Sprinkler Systems, 2023 Edition, Chapter 8, Section 8.16.4.5.3; NFPA Fire Protection Handbook, 21st Edition, Chapter 14, Section 14.3.4.2.
NEW QUESTION # 72
For standpipe systems containing 11/2 - 21/2 in. (40 - 65 mm) hose connection outlets without preconnected hose, a pressure regulating device is required when pressure exceeds
- A. 125 psi (862 kPa).
- B. 100 psi (689 kPa).
- C. 150 psi (1034 kPa).
- D. 175 psi (1207 kPa).
Answer: D
Explanation:
Explanation
Standpipe
Explore
175 psi (1207 kPa).
For standpipe systems containing 11/2 - 21/2 in. (40 - 65 mm) hose connection outlets without preconnected hose, a pressure regulating device is required when the pressure exceeds 175 psi (1207 kPa), according to NFPA 14, Standard for the Installation of Standpipe and Hose Systems, 2019 edition. This requirement applies to Class I and Class III standpipe systems, which are intended for use by fire department personnel or trained occupants. A pressure regulating device is a device that automatically reduces and controls the pressure of the water flowing through the hose connection outlet to a predetermined value.This device helps to prevent excessive pressure that could damage the hose, nozzle, or fittings, or cause difficulty in handling the hose stream123 References:
NFPA 14: Standard for the Installation of Standpipe and Hose Systems1
Standpipe System Design and Calculations | NFPA | NFPA2
ENGINE COMPANY STANDPIPE OPERATIONS:PRESSURE-REGULATING DEVICES3
NEW QUESTION # 73
The ignition test method that exposes the specimen to a known heat flux from a tungsten-quartz heater is referred to as a
- A. lateral ignition apparatus.
- B. cone calorimeter.
- C. fire propagation apparatus.
- D. intermediate-scale calorimeter.
Answer: B
Explanation:
Explanation
The cone calorimeter is an ignition test method that exposes the specimen to a known heat flux from a tungsten-quartz heater. The cone calorimeter measures the heat release rate, mass loss rate, smoke production, and other parameters of the specimen during the test. The cone calorimeter is widely used to evaluate the flammability and fire behavior of materials and products.References:
NFPA 557: Standard for Determination of Fire Loads for Use in Structural Fire Protection Design, 2017 Edition, Section 5.3.2.11 NFPA 556: Guide on Methods for Evaluating Fire Hazard to Occupants of Passenger Road Vehicles,
2019 Edition, Section 4.3.22
Fire Protection Handbook, 20th Edition, Volume 1, Chapter 3, Section 3.2.2.23
NEW QUESTION # 74
Sound meters used to test notification appliances in fire alarm systems shall comply with which standard?
- A. NFPA 70
- B. ANSI S12.13
- C. ANSI S1.42
- D. NFPA 72
Answer: C
Explanation:
Explanation
ANSI S1.4a
Sound meters used to test notification appliances in fire alarm systems shall comply with the standard ANSI S1.4a, Specifications for Sound Level Meters, Type 2 requirements, according to NFPA 72 2010, the National Fire Alarm and Signaling Code.This standard specifies the performance and accuracy criteria for sound level meters that are used to measure the sound pressure levels of audible signals in fire alarm systems1
NEW QUESTION # 75
Wet chemical extinguishing agents when sprayed on a grease fire, extinguish the fire by
- A. Removal of the fuel
- B. Smothering and cooling
- C. Radiation shielding
- D. Removal of the radical free agent
Answer: B
Explanation:
Explanation
Wet chemical extinguishing agents, such as potassium acetate and potassium citrate, when sprayed on a grease fire, extinguish the fire by smothering and cooling. The wet chemical agent reacts with the hot grease and forms a layer of soap-like foam on the surface of the fat, which acts as an insulation between the hot grease and the atmosphere, preventing the escape of combustible vapors and oxygen supply.The wet chemical agent also absorbs heat from the grease and lowers its temperature below the ignition point12 References:
What is the Difference Between a Wet and Dry Chemical Fire ...
Wet Chemical (Class K) Fire Extinguisher - Portable - WFX
NEW QUESTION # 76
The duration of required fire flow in public supply systems ranges from
- A. 1-4 hours.
- B. 1-6 hours.
- C. 3-8 hours.
- D. 2-10 hours.
Answer: A
NEW QUESTION # 77
The typical discharge coefficient of a solid stream nozzle for a standard orifice with sharp edges is?
- A. 0.75
- B. 0.62
- C. 0.95
- D. 0.8
Answer: B
Explanation:
Explanation
0.62
The discharge coefficient of a solid stream nozzle for a standard orifice with sharp edges is a dimensionless number that indicates the ratio of the actual flow rate to the theoretical flow rate of the nozzle. The discharge coefficient depends on the geometry and the flow conditions of the nozzle. According to the web search results, the typical discharge coefficient of a solid stream nozzle for a standard orifice with sharp edges is about 0.62, which means that the actual flow rate is about 62% of the theoretical flow rate.This value is based on the experiments conducted by the National Bureau of Standards (now NIST) and reported in the paper
"Discharge Coefficients of Fire Nozzles"1.The paper also provides a formula to calculate the discharge coefficient for different nozzle diameters and pressures123
NEW QUESTION # 78
For engine driven emergency power supplies, which of the following devices maintains a relatively constant speed of the prime mover throughout the full power output range by varying the fuel input to the prime mover?
- A. Alternator
- B. Distributor
- C. Generator
- D. Governor
Answer: D
Explanation:
Explanation
Governor
For engine driven emergency power supplies, the device that maintains a relatively constant speed of the prime mover throughout the full power output range by varying the fuel input to the prime mover is the governor. A governor is a device that automatically regulates the speed or power of an engine or other prime mover by adjusting the amount of fuel supplied to it. A governor senses the speed of the prime mover and compares it with a desired set point, and then controls the fuel valve to increase or decrease the fuel flow accordingly.By doing so, the governor ensures that the prime mover operates within a narrow range of speed or power, regardless of the load or other factors that may affect its performance12
NEW QUESTION # 79
Fire tests typically relate to two types of fire properties, fire resistance and
- A. flame spread.
- B. length of fire.
- C. smoke spread.
- D. reaction to fire.
Answer: D
Explanation:
Explanation
Fire tests typically relate to two types of fire properties, fire resistance and reaction to fire. Fire resistance is the ability of a building element or component to prevent the passage of heat and flames from one side to another, while reaction to fire is the response of a material or product in contributing to the development and spread of a fire. Fire resistance tests are usually performed on systems or assemblies, such as walls, floors, doors, or windows, while reaction to fire tests are usually performed on materials or products, such as sealants, insulation, cladding, or plastics.References:International Standards and Classifications for Fire Testing - Sika;Testing for Fire Resistance and Reaction to Fire - ICC NTA;'Reaction to Fire' Vs 'Fire resistance' - Ask HILTI;What is the difference between Reaction to Fire and Resistance to Fire ...;Reaction to Fire vs Resistance to Fire | Nullifire UK
NEW QUESTION # 80
Critical Radiant Flux is used to classify
- A. interior floor finishes.
- B. exterior materials.
- C. roofing materials.
- D. interior wall finishes.
Answer: A
Explanation:
Explanation
Critical radiant flux is used to classifyinterior floor finishes. Critical radiant flux is a measure of the minimum radiant heat energy required to sustain flame propagation on a floor material or covering. It is determined by exposing a specimen to a radiant heat gradient and observing the distance from the ignition point to the flame-out point.The shorter the distance, the higher the critical radiant flux and the better the fire performance of the floor material or covering1.Critical radiant flux is used to classify floor materials and coverings according to their fire hazard and resistance, and to specify the minimum requirements for different occupancies and applications2.For example, the International Building Code (IBC) requires that interior floor finishes and coverings in exit access corridors and exit enclosures have a critical radiant flux of not less than
0.45 W/cm2, while those in other spaces have a critical radiant flux of not less than 0.22 W/cm23.Critical radiant flux is also used to evaluate the fire safety of floor materials and coverings in transportation vehicles, such as aircraft, trains, and buses4.
NEW QUESTION # 81
The two major principles used to determine egress width are the
- A. density and group method.
- B. stair width and floor method.
- C. inverse and the evacuation method.
- D. flow and the capacity method.
Answer: D
NEW QUESTION # 82
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