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NEW QUESTION # 45
At what temperature do cellulose nitrate products begin to decompose?
- A. 300° F (150° C)
- B. 581° F (305° C)
- C. 425° F (218° C)
- D. 350° F (177° C)
Answer: A
Explanation:
Explanation
Cellulose nitrate products begin to decompose at about 300 °F (150 °C). This is the temperature at which the nitrate ester bonds start to break down and release nitric acid, which further catalyzes the decomposition. The decomposition temperature depends on the nitrogen content, the stabilizers, and the external heating rate of the cellulose nitrate. Higher nitrogen content, lower stabilizer concentration, and faster heating rate lower the decomposition temperature and increase the risk of thermal runaway.
References:Nitrocellulose - Wikipedia;Comparative analysis of stable decomposition and combustion kinetics of nitrated cellulose;Degradation of aged nitrocellulose investigated by thermal analysis methods;Nitrocellulose;Effect of stabilizers and nitrogen content on thermal properties of nitrocellulose
NEW QUESTION # 46
Critical Radiant Flux is used to classify
- A. interior floor finishes.
- B. roofing materials.
- C. exterior 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 # 47
Which type of construction consists of structural members of approved noncombustible or limited combustible materials with specified fire resistance ratings for exterior bearing walls of 3 or 4 hours?
- A. Type II
- B. Type I
- C. Type III
- D. Type IV
Answer: B
Explanation:
Explanation
The correct answer is A. Type I construction consists of structural members of approved noncombustible or limited combustible materials with specified fire resistance ratings for exterior bearing walls of 3 or 4 hours.
This is the highest level of fire resistance among the five types of construction defined by NFPA 220: Standard for Types of Building Construction.Type I construction is typically used for high-rise buildings made of concrete and protected steel12
NEW QUESTION # 48
Building codes should limit the size of an unsprinklered facility used for the processing and storage of Municipal Solid Waste built of type V construction to how many square feet?
- A. 7,500
- B. 9,000
- C. 10,000
- D. 8,500
Answer: A
Explanation:
Explanation
According to NFPA 230: Standard for the Fire Protection of Storage, 2015 Edition, building codes should limit the size of an unsprinklered facility used for the processing and storage of Municipal Solid Waste (MSW) built of type V construction to 7,500 ft2 (697 m2). This is based on the assumption that the MSW has a heat release rate of 18,000 Btu/ft2-min (200 kW/m2) and a fire growth rate of 0.046 min-1.Type V construction is defined as a type of construction in which the structural elements, exterior walls, and interior walls are of any materials permitted by the code123 References:
NFPA 230: Standard for the Fire Protection of Storage
5 Types of Construction per the IBC | Building Code Trainer
2.4 MUNICIPAL SOLID WASTE LANDFILLS - U.S. Environmental Protection Agency
NEW QUESTION # 49
The primary design approach to mitigate the effect of wind on smoke movement in high-rise buildings is based on
- A. outside temperature.
- B. tightness of the building.
- C. fire department access.
- D. height of the building.
Answer: B
NEW QUESTION # 50
When evaluating the hydraulic properties of water for fire protection system, what is the measurement of a fluid's resistance to flow?
- A. Pressure
- B. Viscosity
- C. Velocity
- D. Density
Answer: B
Explanation:
Explanation
The measurement of a fluid's resistance to flow is calledviscosity.Viscosity is the property of a fluid that describes how easily it can deform or move when subjected to a shear stress, such as the force exerted by a pipe wall or a pump1. A fluid with high viscosity, such as honey, resists flow and requires more pressure to overcome the friction between its layers.A fluid with low viscosity, such as water, flows easily and has less frictional resistance2.Viscosity affects the hydraulic properties of water for fire protection systems, such as the flow rate, pressure loss, and pump power3. Viscosity is usually expressed in units of pascal-second (Pa s) or centipoise (cP) for liquids, and is dependent on the temperature and composition of the fluid.References:
Viscosity | Definition, Facts, Formula, Units, & Examples
Viscosity - The Physics Hypertextbook
Fire Pump Types | NFPA
[12.4: Viscosity and Laminar Flow; Poiseuille's Law]
NEW QUESTION # 51
The maximum distance between hangers for an automatic fire sprinkler system for a threaded lightwall steel pipe of 2 in. diameter is
- A. 8 ft.
- B. 15 ft.
- C. 12 ft.
- D. 10 ft.
Answer: D
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 # 52
Power for driving fire pumps is selected on the basis of reliability, adequacy, economy, and
- A. safety.
- B. adaptability.
- C. ecology.
- D. efficiency.
Answer: A
Explanation:
Explanation
Fire pump
Explore
The correct answer is B.Safety is one of the criteria for selecting the power source for driving fire pumps, according to NFPA 20, Chapter 9.1.1.11. Reliability, adequacy, and economy are the other criteria mentioned in the same chapter. Efficiency, adaptability, and ecology are not explicitly stated as criteria in NFPA 20, although they may be considered as secondary factors in some cases.
1:Pump Installation: Everything About Electric and Diesel Driven Fire ...
NEW QUESTION # 53
What data analysis approach provides the broadest perspective of a fire problem?
- A. Top-down approach
- B. Scenario groupings
- C. Data re-examination
- D. Trend analysis
Answer: A
Explanation:
Explanation
Scenario groupings is a data analysis approach that provides the broadest perspective of a fire problem by identifying and comparing different types of fire incidents based on their characteristics, such as ignition source, fuel, location, time, and outcome. This approach can help reveal patterns, trends, and relationships among fire scenarios and support fire prevention and protection strategies.References:Fire Data Analysis Handbook, Chapter 5: Scenario Groupings; [Fire Protection Handbook], Section 2, Chapter 3: Fire Data Collection and Analysis.
NEW QUESTION # 54
Which of the following statements about smoke detectors is FALSE?
- A. Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires.
- B. Detectors using the photoelectric principle also use a small amount of radioactive material.
- C. Detectors using the cloud chamber principle also make use of the photoelectric principle.
- D. Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires.
Answer: B
Explanation:
Explanation
Smoke detector
Explore
Detectors using the photoelectric principle do not use a small amount of radioactive material. This is a false statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm.Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles12.
Detectors using the cloud chamber principle also use the photoelectric principle. This is a true statement about smoke detectors. Detectors using the cloud chamber principle usea sealed chamber that contains a supersaturated vapor. When smoke enters the chamber, it causes the vapor to condense into droplets that reflect light. The light is then detected by a photoelectric sensor that activates the alarm.Detectors using the cloud chamber principle are very sensitive to small smoke particles34.
Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires.
This is a true statement about smoke detectors. Detectors using the ionization principle use a small amount of radioactive material that ionizes the air in the detection chamber. When smoke enters the chamber, it reduces the ionization and the electric current. The drop in current is then detected by a circuit that activates the alarm.Detectors using the ionization principle are more responsive to high-energy (open flaming) fires that produce small smoke particles12.
Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires.
This is a true statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm.Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles12.
NEW QUESTION # 55
How many additional switches or circuit breakers are allowed for a separate service?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
Explanation
According to NFPA 70: National Electrical Code (NEC) 2020 Edition, Article 230.71(A), each service shall have only one disconnecting means unless the requirements of 230.71(B) are met, which provide four specific service configurations. In each configuration, there shall be not more than six switches or sets of circuit breakers, or a combination of not more than six switches and sets of circuit breakers, per service grouped in any one location. Therefore, the maximum number of additional switches or circuit breakers allowed for a separate service is six.References:
NFPA 70: National Electrical Code (NEC) 2020 Edition, Article 230.71(A) and (B)12 ElectricalLicenseRenewal.com, 230.71 Maximum Number of Disconnects3
NEW QUESTION # 56
The duration of required fire flow in public supply systems ranges from
- A. 3-8 hours.
- B. 1-6 hours.
- C. 1-4 hours.
- D. 2-10 hours.
Answer: C
NEW QUESTION # 57
Sound meters used to test notification appliances in fire alarm systems shall comply with which standard?
- A. ANSI S1.42
- B. ANSI S12.13
- C. NFPA 70
- D. NFPA 72
Answer: A
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 # 58
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. how much mist diverts to the compartment boundaries.
- C. the ability of the mist to directly spray on the fire.
- D. the momentum and direction of the spray relative to the fire.
Answer: D
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 # 59
The travel distance limit for a new unsprinklered educational occupancy is
- A. 250 ft. (76 m).
- B. 150 ft. (45 m).
- C. 200 ft. (61 m).
- D. 175 ft.(53 m).
Answer: D
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 # 60
Fire alarm systems audible appliances ratings are usually stated as a sound pressure level (SPL) at what distance?
- A. 1 ft (0.31 m)
- B. 15 ft (4.57 m)
- C. 20 ft (6.10 m)
- D. 10 ft (3.05 m)
Answer: D
Explanation:
Explanation
Fire alarm systems audible appliances ratings are usually stated as a sound pressure level (SPL) at 10 ft (3.05 m) from the appliance. The SPL is measured in decibels (dB) and indicates the loudness of the sound produced by the appliance. The SPL at 10 ft (3.05 m) is used as a standard reference point for comparing different audible appliances and for designing fire alarm systems to meet the required audibility levels.References:
NFPA 72: National Fire Alarm and Signaling Code, 2019 Edition, Section 18.4.3.11 Fire Protection Handbook, 20th Edition, Volume 1, Chapter 7, Section 7.8.2.12
NEW QUESTION # 61
Potassium bicarbonate is a dry chemical agent considered to be twice as effective as
- A. sodium chloride.
- B. potassium sulfide.
- C. monoammonium phosphate.
- D. Asodium bicarbonate.
Answer: D
Explanation:
Explanation
Potassium bicarbonate is a dry chemical agent that is considered to be twice as effective as sodium bicarbonate in fire suppression, especially for Class B fires involving flammable liquids and gases. This is because potassium bicarbonate has a higher melting point and a lower decomposition temperature than sodium bicarbonate, which allows it to form a more stable and insulating layer on the burning surface.Potassium bicarbonate also has a lower pH and a higher specific gravity than sodium bicarbonate, which enhances its penetration and dispersion abilities123.References:Dry Chemical Agents - Purple-K Powder is Purple - Chemguard;Evaluation of Dry Chemical Fire Extinguishing Standards - NFPA;Potassium bicarbonate - Wikipedia.
NEW QUESTION # 62
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