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NEW QUESTION # 16
Critical Radiant Flux is used to classify
- A. roofing materials.
- B. exterior materials.
- C. interior wall finishes.
- D. interior floor finishes.
Answer: D
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 # 17
Dipping and coating processes should be separated from other operations, materials, or occupancies by location, fire walls, or
- A. process systems.
- B. fire partitions.
- C. exhaust systems
- D. operational procedures.
Answer: D
Explanation:
Explanation
Dipping and coating processes using flammable or combustible liquids pose a significant fire and explosion hazard and should be isolated from other operations, materials, or occupancies by location, fire walls, or operational procedures. Location refers to the physical separation of the process from other areas by distance or barriers. Fire walls are fire-resistance-rated assemblies that prevent the spread of fire from one side to the other. Operational procedures are rules or guidelines that regulate the conduct of the process and its personnel, such as limiting the amount of flammable or combustible liquids in use, controlling ignition sources, and providing adequate ventilation.
References: NFPA 34: Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, 2021 Edition, Section 4.21; Fire Protection Handbook, 20th Edition, Volume 1, Chapter
8, Section 8.3.12.
1:NFPA 34: Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids2:Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8
NEW QUESTION # 18
Which smoke detector type contains a small amount of radioactive material and functions by sensing a decrease in conductance of the air when smoke particles enter the chamber?
- A. Cloud chamber air sampling
- B. lonization
- C. Light scattering
- D. Photoelectric
Answer: B
Explanation:
Explanation
Smoke detector
Explore
The smoke detector type that contains a small amount of radioactive material and functions by sensing a decrease in conductance of the air when smoke particles enter the chamber is theionization smoke detector.
Ionization smoke detectors use a small amount of americium-241, a radioactive element, to ionize the air molecules inside a sensing chamber. This creates a low-level electric current between two electrodes. When smoke enters the chamber, it disrupts the ionized air and reduces the current flow. This triggers the alarm to sound.Ionization smoke detectors are more sensitive to small particles of smoke, such as those produced by flaming fires1.However, they may also be more prone to false alarms from cooking or steam, and they require proper disposal of the radioactive source2.
References:
Smoke Detector Types: Which Type of Smoke Detector Is Best? - X-Sense
How Does Your Smoke Detector Work? - ThoughtCo
NEW QUESTION # 19
NFPA 750 defines a low-pressure water mist system as one that operates at or below
- A. 200 psi (13.8 bar).
- B. 125 psi (8.6 bar).
- C. 150 psi (10.3 bar).
- D. 175 psi (11.9 bar).
Answer: C
NEW QUESTION # 20
Environmental Protection Agency standards require solid waste be treated as hazardous if it is a listed waste and/or meets the characteristics prescribed by the standard for toxicity, reactivity, corrosivity, and
- A. solubility.
- B. treatability.
- C. lignitability.
- D. compactability.
Answer: C
Explanation:
Explanation
Hazardous waste
Explore
The correct answer is C. Environmental Protection Agency (EPA) standards require solid waste be treated as hazardous if it is a listed waste and/or meets the characteristics prescribed by the standard for toxicity, reactivity, corrosivity, andignitability.A listed waste is a waste that appears on one of the four lists of hazardous wastes in the Code ofFederal Regulations (CFR) part 261 subpart D1.A characteristic waste is a waste that exhibits one or more of the following traits: toxicity, reactivity, corrosivity, or ignitability2.
Toxicity is the ability of a waste to leach harmful chemicals into the environment. Reactivity is the tendency of a waste to undergo violent chemical reactions or generate toxic gases. Corrosivity is the property of a waste to corrode metals or damage living tissues.Ignitability is the capacity of a waste to catch fire under certain conditions2.These characteristics are defined by specific tests and criteria in the CFR part 261 subpart C3.The EPA standards for hazardous waste are based on the Resource Conservation and Recovery Act (RCRA), which is the federal law that regulates the management of solid and hazardous waste in the United States4.
NEW QUESTION # 21
The computer simu-lation egress model that is often referred to as the hydraulic model and also known as
- A. movement model.
- B. egress model.
- C. behavioral simulation model.
- D. single-parameter estimation model.
Answer: A
NEW QUESTION # 22
OSHA requires fire fighter training in hazardous materials, respiratory protection, and
- A. emergency communications.
- B. communicable diseases.
- C. live fire training.
- D. emergency medical services.
Answer: B
Explanation:
Explanation
OSHA requires fire fighter training in hazardous materials, respiratory protection, and communicable diseases.
According to OSHA standards, fire fighters must receive annual training in hazardous materials and infectious diseases, and initial and periodic training in respiratory protection. These topics are essential for fire fighters to protect themselves and others from exposure to harmful substances and pathogens.
References:OSHA training requirements for volunteer fire company personnel;What are the Current OSHA/PESH Training Requirement for Firefighters: A Review;Training requirements for firefighters;Training Requirements in OSHA Standards
NEW QUESTION # 23
The coefficient of discharge of a fire hydrant when the outlet is smooth and well-rounded outlet is?
- A. 0.70.
- B. 0.87
- C. 0.82
- D. 0.90.
Answer: D
Explanation:
Explanation
The coefficient of discharge of a fire hydrant when the outlet is smooth and well-rounded is 0.90. This is the highest coefficient given by NFPA 291 for fire hydrant outlets, and it means that the stream is almost as large as the outlet diameter. The coefficient of discharge is a factor that accounts for the difference between the actual flow and the theoretical flow from an orifice, based on the shape and condition of the outlet1. A lower coefficient means that the stream is more restricted and has a smaller cross-sectional area than the outlet. NFPA 291 provides three coefficients for fire hydrant outlets, depending on how the outlet projects into the barrel: 0.90 for smooth and well-rounded outlets, 0.80 for outlets with a hexagonal or square projection, and 0.70 for outlets with a long projection or adamaged edge2. The coefficient of discharge is used to calculate the flow rate from the pitot pressure measured at the centerline of the stream3. References:
Fire Fighting Foams - Chemguard
Guide to Hydrant Flow Testing | WSRB
New Fire Hydrant Flow Test Charts (PDF) - MeyerFire
NEW QUESTION # 24
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 II
- B. Class IV
- C. Class I
- D. Class III
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 # 25
What is the minimum pipe diameter size for direct discharge of steam inside a water tank?
- A. 1 1/2 in. (38 mm)
- B. 1/2 in. (13 mm)
- C. 1 in. (25 mm)
- D. 2 in. (50 mm)
Answer: D
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 # 26
The principle fuels used in a modern grain dryer are natural gas, vaporized liquid propane, and
- A. fuel oil.
- B. gasoline.
- C. hydrogen.
- D. methane.
Answer: A
NEW QUESTION # 27
The maximum distance between hangers for an automatic fire sprinkler system for a threaded lightwall steel pipe of 2 in. diameter is
- A. 12 ft.
- B. 10 ft.
- C. 15 ft.
- D. 8 ft.
Answer: B
Explanation:
Explanation
According to NFPA 13, Table 17.4.2.1 (a), the maximum distance between hangers for an automatic fire sprinkler system for a threaded lightwall steel pipe of 2 in. diameter is 10 ft. This is done to ensure that there are not long stretches of unsecured piping that could sag, leak, or break. The distance between hangers may vary depending on the type of pipe, the type of hanger, and the seismic design category of the building.References:NFPA 13, Table 17.4.2.1 (a);Hangers and Support of Sprinkler System Piping | NFPA | NFPA.
NEW QUESTION # 28
What gas is liberated when magnesium shavings or chips come in contact with water?
- A. Oxygen
- B. Hydrogen
- C. Chlorine
- D. Acetylene
Answer: B
NEW QUESTION # 29
The travel distance limit for a new unsprinklered educational occupancy is
- A. 200 ft. (61 m).
- B. 175 ft.(53 m).
- C. 250 ft. (76 m).
- D. 150 ft. (45 m).
Answer: B
Explanation:
Explanation
According to NFPA 101: Life Safety Code, 2018 Edition, the travel distance limit for a new unsprinklered educational occupancy is 175 ft. (53 m). This is the maximum distance that an occupant has to travel from any point within the building to reach an exit or exit access door. The travel distance limit for a new sprinklered educational occupancy is 250 ft. (76 m).These limits are based on the assumption that the building has at least two exits or exit access doors from each room or space12 References:
NFPA 101: Life Safety Code, 2018 Edition, Chapter 14
Deco DeD - I Dig Hardware
NEW QUESTION # 30
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. Governor
- D. Generator
Answer: C
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 # 31
The Class of an unstable reactive gas that readily undergoes violent chemical change at elevated temperatures and pressures is
- A. 0
- B. 1
- C. 2
- D. 3
Answer: B
Explanation:
Explanation
Class 3 unstable reactive gas is defined as a material that in itself is capable of detonation or explosive decomposition or reaction at normal temperatures and pressures with a strong initiating source or if heated under confinement. This class of gas readily undergoes violent chemical change at elevated temperatures and pressures.
References:NFPA 55: Compressed Gases and Cryogenic Fluids Code, 2016 Edition, Section
3.3.51.14.3;International Fire Code, 2015 Edition, Appendix E, Section E102.1.1
NEW QUESTION # 32
For wet-pipe automatic sprinkler systems, the only proper way to test the operation of a vane-type water flow alarm initiating device is to open the
- A. check valve from the city connection.
- B. valve at the inspector's test connection.
- C. alarm test by-pass valve at the system's main riser.
- D. main (2 in. diameter) drain.
Answer: B
Explanation:
Explanation
valve at the inspector's test connection.
For wet-pipe automatic sprinkler systems, the only proper way to test the operation of a vane-type water flow alarm initiating device is to open the valve at the inspector's test connection. This is a small valve that is located at the end of a pipe that is connected to the sprinkler system, usually at the most remote or highest point. The inspector's test connection simulates the flow of a single sprinkler head and activates the vane-type water flow switch, which in turn triggers the fire alarm panel and the external alarm devices.Opening the valve at the inspector's test connection also allows the water to drain from the system, preventing corrosion and freezing1234 Opening the main (2 in. diameter) drain is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not create enough flow to activate the switch. The main drain is used to drain the entire sprinkler system for maintenance or repair purposes, and it is usually located at the main riser or the fire department connection.Opening the main drain may also cause a pressure drop in the system, which could affect the performance of the sprinklers1234 Opening the alarm test by-pass valve at the system's main riser is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not simulate the actual flow of a sprinkler head.
The alarm test by-pass valve is used to test the operation of the external alarm devices, such as the water motor gong or the electric bell, without activating the fire alarm panel. The alarm test by-pass valve is usually located near the alarm check valve or the water flow switch, and it allows water to flow through a small orifice to the alarm devices.Opening the alarm test by-pass valve does not create enough flow to activate the vane-type water flow switch1234 Opening the check valve from the city connection is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not create any flow in the sprinkler system. The check valve from the city connection is used to prevent the backflow of water from the sprinkler system to the city water supply, and it is usually located at the fire department connection or the main riser.Opening the check valve from the city connection does not affect the water flow in the sprinkler system, and it does not activate the vane-type water flow switch1234 References:
Fire Sprinkler Flow Switch & Tamper Switch Inspection & Maintenance3
Sprinkler System Water Flow Device Testing - ORR Protection2
VSR-AT Auto-Test Waterflow Alarm Switch | Potter Electric4
WFDNA Series Vane-type Waterflow Detectors - Steel Fire Equipment5
NEW QUESTION # 33
A multistage centrifugal fire pump is defined as
- A. being able to operate with a diesel, steam or electric driver.
- B. a pump installed on more than one floor or one building.
- C. requiring more than one input location connection.
- D. having two or more impellers on one shaft as a single unit.
Answer: D
Explanation:
Explanation
Fire pump
Explore
A multistage centrifugal fire pump is defined as having two or more impellers on one shaft as a single unit. A multistage centrifugal pump is a type of centrifugal pump that uses multiple impellers to increase the pressure and flow of water.Each impeller acts like a single-stage pump within a chain of pumps, and the water passes through each impeller in series, gaining pressure and velocity at each stage1.A multistage centrifugal fire pump is used to provide high-pressure water for fire protection systems, especially in high-rise buildings or large industrial facilities2.A multistage centrifugal fire pump can be driven by an electric motor, a diesel engine, or a steam turbine3.References:
Our Guide to Multistage Centrifugal Pumps | C&B Equipment
Fire Pump Types | NFPA
NFPA 20: Changes to the fire pump standard - Consulting
NEW QUESTION # 34
To be considered a family day-care home, what is the maximum allowable number of clients?
- A. Twelve
- B. Four
- C. Two
- D. Six
Answer: D
Explanation:
Explanation
The maximum allowable number of clients for a family day-care home varies by state and territory, but generally ranges from four to six children unrelated to the operator. A family day-care home is a facility in which a small group of children receive child care services in the provider's own home, such as a house, apartment, or condo unit1. To ensure a safe care environment, states and territories use child care licensing regulations to limit the number of children, as well as the number of infants and toddlers, that can receive care in a family day-care home1. Some states and territories may also offer certification or registration to help ensure some basic health and safety standards in certain home-based child care programs1. To learn more about how your state or territory regulates family day-care homes, you can visit the child care consumer education website and child care resource and referral agency for your state or territory1. References:
Family Child Care Homes | Childcare.gov
NEW QUESTION # 35
What type of property classifications experience the majority of fire deaths in the United States?
- A. Educational
- B. Business
- C. One- and two-family dwellings
- D. Public Assembly
Answer: C
Explanation:
Explanation
The type of property classifications that experience the majority of fire deaths in the United States areone- and two-family dwellings.According to the NFPA, one- and two-family dwellings accounted for 64 percent of all civilian fire deaths in 2021, followed by apartments with 11 percent, and other residential properties with 1 percent1.One- and two-family dwellings are more vulnerable to fire fatalities because they often lack adequate fire protection systems, such as smoke alarms and sprinklers, and havemore potential sources of ignition, such as cooking, heating, and smoking2. Additionally, one- and two-family dwellings may have less escape routes, longer response times, and more occupants, especially children and elderly, who are at higher risk of fire death.References:
US Fire Loss in 2021 NFPA
Home Structure Fires - NFPA
[Fire Death Rate Trends: An International Perspective]
NEW QUESTION # 36
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. fire propagation apparatus.
- C. intermediate-scale calorimeter.
- D. cone calorimeter.
Answer: D
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 # 37
The removal of flammable vapors by displacement for cleaning a storage tank can be accomplished by displacement with air, inert gas and
- A. water
- B. absorbant
- C. earth
- D. sodium bicarbonate
Answer: A
Explanation:
Explanation
The removal of flammable vapors by displacement for cleaning a storage tank can be accomplished by displacement with air, inert gas, and water. Water is a common method of displacing flammable vapors from tanks, as it is readily available, inexpensive, and non-reactive with most fuels. Water can be sprayed into the tank to create a water seal that prevents the vapors from escaping and reduces the oxygen concentration in the tank. Water can also be used to rinse the tank walls and remove any residual fuel. However, water displacement may not be suitable for some tanks that contain water-sensitive or water-soluble fuels, or for tanks that have limited drainage or disposal facilities.
References:ust permanent closure requirements - Nevada;A Guide to Safety in Confined Spaces - CDC Stacks;Fire Explosion Prevention - Visual Encyclopedia of Chemical Engineering ...
NEW QUESTION # 38
What type of load is the weight of items such as furnishings, people, and equipment?
- A. Live
- B. Static
- C. Residual
- D. Dead
Answer: D
Explanation:
Explanation
The weight of items such as furnishings, people, and equipment is called dead load. Dead load is the permanent load that is applied to a structure or a component of a structure1. It includes the weight of the structure itself, as well as any fixed attachments or equipment2. Dead load is one of the factors that determines the fire resistance rating of a structure or a component3. References:
NFPA 557: Standard for Determination of Fire Loads for Use in Structural Fire Protection Design An Overview of Fire Protection for Structural Engineers SFPE Handbook of Fire Protection Engineering, 5th edition
NEW QUESTION # 39
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