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NEW QUESTION # 60
Which of the following would NOT be an appropriate purpose for employing a guard service to protect a property against fire loss?
- A. To protect the property at times when the management is not present
- B. To perform routine housekeeping and equipment maintenance operations during nonproduction hours
- C. To facilitate and control the movement of persons into, out of, and within the property
- D. To carry out procedures for the orderly conduct of some operations on the property
Answer: B
Explanation:
Explanation
The correct answer is C. To perform routine housekeeping and equipment maintenance operations during nonproduction hours would NOT be an appropriate purpose for employing a guard service to protect a property against fire loss. A guard service is typically hired to provide security and protection for a property, not to perform other tasks that are unrelated to fire prevention or control. Housekeeping and equipment maintenance operations should be done by qualified and authorized personnel who are trained and equipped to handle any potential fire hazards. A guard service may not have the necessary skills, tools, or authority to perform these operations safely and effectively.Moreover, these operations may interfere with the guard service's primary duty of monitoring and patrolling the property for any signs of fire or intrusion12345
NEW QUESTION # 61
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 IV
- B. Type III
- C. Type II
- D. Type I
Answer: D
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 # 62
Computers and other information technology equipment are particularly susceptible to
- A. foam, metal powders, and dry chemicals.
- B. heat, steam, and combustion products.
- C. special extinguishing agents.
- D. light, hoselines, and airborn dust.
Answer: B
Explanation:
Explanation
Computers and other information technology equipment are particularly susceptible to heat, steam, and combustion products, which can damage their sensitive components, cause data loss or corruption, and impair their functionality.Therefore, fire protection for IT equipment should consider the potential sources of heat, steam, and combustion products, such as electrical faults, flammable liquids, dust accumulation, water-based sprinklers, or smoke from adjacent areas, and implement appropriate measures to prevent, detect, and suppress fires, as well as to minimize the exposure of IT equipment to these hazards1234.References:Standard for the Fire Protection of Information Technology Equipment;Fire Protection of Computer Rooms-Legal Obligations and Best Practices - ISACA;Exploring Requirements for Information Technology Equipment;Demystifying IT room protection requirements - Consulting.
NEW QUESTION # 63
Which factor plays a significant role in most industrial fire and explosion losses?
- A. Mechanical
- B. External
- C. Process
- D. Human
Answer: D
Explanation:
Explanation
The answer is C. Human factor plays a significant role in most industrial fire and explosion losses.According to a study by Allianz Global Corporate & Specialty (AGCS), human error is the cause of 80% of all industrial accidents, including fires and explosions1. Human error can include mistakes, negligence, violations, or sabotage. Some examples of human errors that can lead to fires and explosions are:
Improper handling or storage of flammable or combustible materials
Failure to follow safety procedures or regulations
Lack of training or supervision
Poor maintenance or inspection of equipment or machinery
Ignoring or disabling alarms or warning systems
Smoking or using open flames near hazardous areas
Intentional or accidental ignition of explosives or incendiaries
To prevent or reduce the impact of human errors, industrial facilities should implement effective risk management strategies, such as:
Providing regular and adequate training and education for workers and managers Establishing and enforcing clear and consistent safety policies and rules Conducting thorough and frequent audits and inspections Installing and maintaining reliable fire protection systems and equipment Developing and practicing emergency response and evacuation plans Encouraging a positive safety culture and communication among all stakeholders
NEW QUESTION # 64
Typical fire pump drivers reach maximum brake horsepower between
- A. 110-125% of rated capacity.
- B. 65-85% of rated capacity.
- C. 140-170% of rated capacity.
- D. 90-100% of rated capacity.
Answer: C
Explanation:
Explanation
Fire pump
Explore
Typical fire pump drivers reach maximum brake horsepower (BHP) between 140% and 170% of rated capacity, depending on the type and size of the pump. This means that the driver must be able to provide enough power to operate the pump at its peak efficiency point, which is usually beyond the rated capacity. The rated capacity is the flow rate at which the pump is designed to deliver a certain pressure, as specified by NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection. The maximum BHP is the highest power output required by the pump at any point on its performancecurve. The driver must be sized to match the maximum BHP of the pump, with some allowance for service factor and safety margin.References
:Understanding the Basics of Fire Pumps | Pumps & Systems;How are Engines and Motors Sized for Fire Pumps?; NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, 2023 Edition, Chapter 4, Section 4.7.
NEW QUESTION # 65
The duration of required fire flow in public supply systems ranges from
- A. 1-4 hours.
- B. 2-10 hours.
- C. 3-8 hours.
- D. 1-6 hours.
Answer: A
NEW QUESTION # 66
In a large-scale test organized by the Fire Protection Research Foundation (FPRF) to study the interaction between sprinklers, roof vents, and draft curtains, what factor made the test results difficult to interpret for use in field applications?
- A. External environmental forces on the test building
- B. The use of an exhaust to an abatement system
- C. The controlled nature of the tests
- D. The number of vents used during the tests
Answer: B
Explanation:
Explanation
The use of an exhaust to an abatement system during the large-scale tests made the test results difficult to interpret for use in field applications. The exhaust system was used to reduce the environmental impact of the tests, but it also altered the natural buoyancy-driven flow of the smoke and heat through the vents and draft curtains. This created a pressure difference between the inside and outside of the test building, which affected the performance of the sprinklers, vents, and draft curtains. Therefore, the test results may not accurately reflect the conditions that would occur in real buildings without an exhaust system.
References: Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.3.11; Sprinkler, Smoke and Heat Vent, Draft Curtain Interaction: Large Scale Experiments and Modeling2.
NEW QUESTION # 67
In the plastics industry, which one of the following is NOT one of the four broad areas of processing?
- A. Conversion
- B. Manufacturing
- C. Finishing
- D. Polymerization
Answer: B
Explanation:
Explanation
In the plastics industry, the four broad areas of processing arepolymerization,conversion,finishing, and recycling1.Polymerization is the process of creating plastic resins from monomers or pre-polymers, using chemical reactions such as addition, condensation, or ring-opening2.Conversion is the process of transforming plastic resins into plastic products, using various methods such as injection molding, blow molding, extrusion, rotational molding, and thermoforming3.Finishing is the process of adding value to plastic products, such as coating, printing, welding, or assembling4.Recycling is the process of recovering plastic waste and converting it into new plastic products or raw materials, using mechanical, chemical, or biological methods5. Therefore, manufacturingis not one of the four broad areas of processing in the plastics industry, as it is a general term that encompasses all the stages of producing plastic products from raw materials.References:
Plastics Manufacturing: Types of Plastic and Processes - Deskera
Plastics industry - Wikipedia
Methods of Processing Plastic - Plastics Industry
Plastic recycling - Wikipedia
Polymerization - an overview | ScienceDirect Topics
NEW QUESTION # 68
What are the two classes of fire models?
- A. Behavioral and theoretical
- B. Physical and mathematical
- C. Open and closed
- D. Field and laboratory
Answer: B
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 # 69
According to the Consumer Products Safety Commission, what type of fabric is used 51% of the time on upholstered furniture?
- A. Cellulosic
- B. Leather
- C. Coated PVC
- D. Thermoplastic
Answer: A
Explanation:
Explanation
According to the Consumer Products Safety Commission (CPSC), the most common type of fabric used on upholstered furniture is cellulosic. Cellulosic fabrics are made from natural fibers derived from plants, such as cotton, linen, rayon, and hemp. Cellulosic fabrics account for about 51% of the total fabric weight used on upholstered furniture in the United States1. Cellulosic fabrics are popular because they are soft, comfortable, breathable, and versatile. However, they are also highly flammable and can contribute to the spread of fire if ignited2. Therefore, the CPSC has established a flammability standard for upholstered furniture that requires cellulosic fabrics to pass a smolder resistance test3. References:
Upholstered Furniture Business Education | CPSC.gov
Fire Fighting Foams - Chemguard
Standard for the Flammability of Residential Upholstered Furniture
NEW QUESTION # 70
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. 0.90.
- D. 0.82
Answer: C
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 # 71
The typical discharge coefficient of a solid stream nozzle for a standard orifice with sharp edges is?
- A. 0.75
- B. 0.8
- C. 0.62
- D. 0.95
Answer: C
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 # 72
Sound meters used to test notification appliances in fire alarm systems shall comply with which standard?
- A. NFPA 72
- B. ANSI S12.13
- C. NFPA 70
- D. ANSI S1.42
Answer: D
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 # 73
Fire alarm systems audible appliances ratings are usually stated as a sound pressure level (SPL) at what distance?
- A. 20 ft (6.10 m)
- B. 10 ft (3.05 m)
- C. 15 ft (4.57 m)
- D. 1 ft (0.31 m)
Answer: B
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 # 74
Which foam extinguishing agent can be proportioned into final concentrations of 1%, 3%, and 6%?
- A. Low-Temperature Foaming Agents
- B. Aqueous Film-Forming Agents (AFFF)
- C. Protein Foaming Agents (P)
- D. Film-Forming Fluoroprotein Agents (FFFP)
Answer: B
Explanation:
Explanation
Aqueous film-forming agents (AFFF) are synthetic foam concentrates that can be proportioned into final concentrations of 1%, 3%, and 6%, depending on the type of fuel and application method12. AFFF forms a thin aqueous film on the surface of the flammable liquid, which prevents vapor release and provides rapid fire knockdown and extinguishment3. AFFF is suitable for Class B fires involving hydrocarbon fuels such as gasoline, diesel, kerosene, etc. References:
Fire Fighting Foams - Chemguard
Extinguishing foam: types, operation and application areas
[NFPA 11: Standard for Low-, Medium-, and High-Expansion Foam]
NEW QUESTION # 75
What is the background color used from the source to the outlets of a nitrous oxide medical gas system?
- A. Yellow
- B. Blue
- C. Gray/black
- D. Black
Answer: B
Explanation:
Explanation
The background color used from the source to the outlets of a nitrous oxide medical gas system is blue. This is the standard color coding for nitrous oxide cylinders and pipelines in medical gas pipeline systems12. The color coding helps to identify the gas type and prevent accidental misconnections or cross-contamination3. The color coding also indicates the pressure and flow characteristics of the gas system4. References:
Colour coding of copper pipes in Medical gas pipeline system according ...
Doc 177 20 Medical Gas Cylinders Colour Coding - EIGA
Medical Gas Coding Color Chart & Explanation - Bay Corporation
Medical gases Health Technical Memorandum 02-01: Medical gas pipeline ...
NEW QUESTION # 76
NFPA 25 requires initial testing of representative samples of fast response sprinklers after
- A. 5 years.
- B. 20 years.
- C. 50 years.
- D. 10 years.
Answer: B
Explanation:
Explanation
20 years.
According to NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, 2020 edition, fast response sprinklers are those that have a response time index (RTI) of 50 (m s)^(1/2) or less.These sprinklers are designed to activate faster than standard response sprinklers in the event of a fire, and they are typically used in light hazard, ordinary hazard, and residential occupancies1 NFPA 25 requires initial testing of representative samples of fast response sprinklers after 20 years from the date of manufacture, and subsequent testing every 10 years thereafter. The testing involves removing a minimum of four sprinklers or 1% of the total number of sprinklers per individual sprinkler sample, whichever is greater, and sending them to a recognized testing laboratory. The laboratory will perform a plunge test, which measures the time it takes for the sprinkler to operate when exposed to a specified air temperature.The test results will indicate whether the sprinklers meet the acceptance criteria or need to be replaced123 References:
NFPA 25: Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems1 Sprinkler System Inspections, Testing, and Maintenance Frequencies Explained | NFPA4 Sprinkler Testing on Quick Response Sprinklers: What You Need to Know2 NFPA 25 ITM Quick Reference Guide - hillgrp.com3
NEW QUESTION # 77
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 III
- D. Class I
Answer: D
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 # 78
In considering the rating of audible appliances, in wide-open spaces, how many decibels does the sound pressure level (SPL) decrease every time the distance from the source is doubled?
- A. 10 dB
- B. 16 dB
- C. 4 dB
- D. 6 dB
Answer: D
Explanation:
Explanation
The correct answer is B. In wide-open spaces, the sound pressure level (SPL) decreases by 6 decibels (dB) every time the distance from the source is doubled. This is known as the inverse square law of sound propagation, which states that the intensity of sound is inversely proportional to the square of the distance from the source.For example, if the SPL at 1 meter from the source is 100 dB, then the SPL at 2 meters from the source is 94 dB, and the SPL at 4 meters from the source is 88 dB123
NEW QUESTION # 79
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