Latest NFPA CFPS First Attempt, Exam real Dumps Updated [Mar-2024]
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NEW QUESTION # 42
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. Distributor
- B. Governor
- C. Alternator
- D. Generator
Answer: B
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 # 43
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 I
- B. Type IV
- C. Type II
- D. Type III
Answer: A
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 # 44
What type of property classifications experience the majority of fire deaths in the United States?
- A. One- and two-family dwellings
- B. Public Assembly
- C. Business
- D. Educational
Answer: A
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 # 45
All of the following Road Tunnel fire model types are used EXCEPT
- A. field models.
- B. zone models.
- C. two-dimensional models.
- D. one-dimensional models.
Answer: C
Explanation:
Explanation
Two-dimensional models are not a common type of road tunnel fire models. Most road tunnel fire models are either one-dimensional, zone, or field models. One-dimensional models use a simplified approach to describe the fire and smoke behavior along the tunnel axis, assuming uniform conditions across the tunnel cross-section. Zone models divide the tunnel into two or more zones, each with uniform properties, and apply mass and energy conservation equations to each zone. Field models use computational fluid dynamics (CFD) to solve the governing equations for mass, momentum, energy, and species transport in a three-dimensional grid, capturing the spatial and temporal variations of the fire and smoke phenomena. Two-dimensional models are rarely used for road tunnel fire simulations, as they cannot account for the complex three-dimensional effects of fire and ventilation in tunnels.
References:Design Fires in Road Tunnels | The National Academies Press;CFD Modelling of Fire Ventilation in Road Tunnels - Academia.edu;Findings of the International Road Tunnel Fire Detection Research ...1
NEW QUESTION # 46
Which of the following statements about smoke detectors is FALSE?
- A. Detectors using the cloud chamber principle also make use of the photoelectric principle.
- B. Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires.
- C. Detectors using the photoelectric principle also use a small amount of radioactive material.
- D. Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires.
Answer: C
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 # 47
The incident command system (ICS) under the National Incident Management System (NIMS) has how many major functional areas?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 48
The ratio of the weight of a solid or a liquid substance to the weight of an equal volume of water is referred to as
- A. relative humidity.
- B. specific density.
- C. relative density.
- D. specific gravity.
Answer: D
Explanation:
Explanation
The ratio of the weight of a solid or a liquid substance to the weight of an equal volume of water is referred to asspecific gravity. Specific gravity is a dimensionless quantity that is defined as the ratio of the density of a substance to the density of the water at a specified temperature.The density of water at 4 0C is commonly used as a reference point1. Specific gravity can be calculated using the following formula:
SG=fracrhosubstancerhoH2O
where rhosubstance is the density of the substance and rhoH2O is the density of water. Specific gravity can be used to compare the relative densities of different substances and to determinewhether a substance will sink or float in water.A substance with a specific gravity less than 1 will float in water, while a substance with a specific gravity greater than 1 will sink in water2.
For example, the specific gravity of gold is 19.3, which means that gold is 19.3 times denser than water.
Therefore, gold will sink in water. The specific gravity of ice is 0.92, which means that ice is 0.92 times denser than water. Therefore, ice will float in water.
References:
Specific gravity | Formula, Units, & Equation | Britannica
Specific Gravity - Definition, Calculation, Solved Examples, FAQs - BYJU'S
NEW QUESTION # 49
The removal of flammable vapors by displacement for cleaning a storage tank can be accomplished by displacement with air, inert gas and
- A. absorbant
- B. earth
- C. water
- D. sodium bicarbonate
Answer: C
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 # 50
Panic hardware devices are designed to facilitate the release of the latching device on a door with a pressure note xceeding
- A. 5 pounds (2.3 kg.) is applied in the direction of exit travel.
- B. 10 pounds (4.5 kg.) is applied in the direction of exit travel.
- C. 20 pounds (9.1 kg.) is applied in the direction of exit travel.
- D. 15 pounds (6.8 kg.) is applied in the direction of exit travel.
Answer: D
Explanation:
Explanation
Panic hardware devices are designed to facilitate the release of the latching device on a door with a pressure not exceeding 15 pounds (6.8 kg.) is applied in the direction of exit travel. This is the maximum force allowed by the codes and standards that regulate the use and installation of panic hardware, such as NFPA 101, NFPA
80, and ANSI/BHMA A156.3. The purpose of this requirement is to ensure that the doors can be easily opened by anyone in an emergency situation, without prior knowledge or special effort.References:Codes to Know for Panic Hardware - Facilitiesnet;Panic and emergency escape hardware | ASSA ABLOY | ASSA ABLOY; NFPA 101, Life Safety Code, 2023 Edition, Chapter 7, Section 7.2.1.7.2; NFPA 80, Standard for Fire Doors and Other Opening Protectives, 2023 Edition, Chapter 6, Section 6.1.3.5.1; ANSI/BHMA A156.3, Standard for Exit Devices, 2014 Edition, Section 4.1.1.
NEW QUESTION # 51
What type of smoke management method is referred to as smoke purging, smoke removal, smoke exhaust, or smoke extraction?
- A. Dilution
- B. Airflow
- C. Compartmentation
- D. Pressurization
Answer: B
Explanation:
Explanation
Smoke purging, smoke removal, smoke exhaust, or smoke extraction are different terms for the same type of smoke management method, which is airflow. Airflow is the method of controlling smoke by creating a flow of air that either pushes or pulls the smoke away from the desired areas. Airflow can be achieved by natural or mechanical means, such as vents, fans, or dampers. Airflow can also be used to create a smoke layer above the occupant level in large spaces, such as atriums or warehouses, by exhausting the hot smoke and supplying fresh air below the layer.References:Smoke Extraction System - NAFFCO Smoke Management;Post-Fire Smoke Purge Systems: When Are They Required? - NY Engineers; NFPA Fire Protection Handbook, 21st Edition, Chapter 9, Section 9.2.1.
NEW QUESTION # 52
When assessing industrial fire risks, the type of risk management conducted depends on the significance of the decision, the complexity of the problem, and
- A. time and cost limitations.
- B. owner and management expectations.
- C. documentation requirements.
- D. evaluation methodologies.
Answer: A
NEW QUESTION # 53
Response Time Index (RTI) is a value applicable to
- A. Measure of thermal sensitivity of the air evacuation device of a dry pipe sprinkler system.
- B. Measure of thermal sensitivity of a sprinkler's activation.
- C. Measure of thermal sensitivity of a wet pipe sprinkler system's alarm device.
- D. Amount of time required for water to reach the most remote sprinkler.
Answer: B
Explanation:
Explanation
Response Time Index (RTI) is a measure of thermal sensitivity of a sprinkler's activation. It indicates how quickly the sprinkler responds to the heat from a fire. RTI is calculated by using the operating time, operating temperature, air temperature, air velocity, and conductivity factor of the sprinkler. RTI is independent of the gas velocity but depends on the properties of the sprinkler head such as mass, specific heat capacity andsurface area of the thermal sensing element. RTI is used to classify sprinklers into fast response or standard response categories.
References:The Basics of Sprinkler Thermal Characteristics | NFPA;Sprinkler Characteristics According to NFPA 13 - Fire Protection ...;Response time index (RTI) - Oil and Gas Drilling Glossary;RESPONSE TIME INDEX OF SPRINKLERS - Department of Building Environment ...
NEW QUESTION # 54
Which of the following would NOT be an appropriate purpose for employing a guard service to protect a property against fire loss?
- A. To carry out procedures for the orderly conduct of some operations on the property
- B. To perform routine housekeeping and equipment maintenance operations during nonproduction hours
- C. To protect the property at times when the management is not present
- D. To facilitate and control the movement of persons into, out of, and within 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 # 55
What type of process hazard analysis program addresses the prevention of flammable and hazardous materials released from containment?
- A. Management of change
- B. Mechanical integrity
- C. Fault tree
- D. Process safety
Answer: D
Explanation:
Explanation
Process safety is the type of process hazard analysis program that addresses the prevention of flammable and hazardous materials released from containment. Process safety is a discipline that focuses on the prevention and control of incidents that have the potentialto cause catastrophic consequences involving fire, explosion, or toxic release. Process safety involves the application of engineering and management principles, criteria, and techniques to identify, understand, and control process hazards. Process safety covers many aspects of a process, such as design, operation, maintenance, inspection, testing, and emergency response.
References: Process hazard analysis - Wikipedia1; What does the OSHA standard, - Occupational Safety and Health Administration2; Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.3.13.
NEW QUESTION # 56
Power for driving fire pumps is selected on the basis of reliability, adequacy, economy, and
- A. adaptability.
- B. safety.
- C. efficiency.
- D. ecology.
Answer: B
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 # 57
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 ability of the mist to directly spray on the fire.
- C. how much mist diverts to the compartment boundaries.
- 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 # 58
The duration of required fire flow in public supply systems ranges from
- A. 3-8 hours.
- B. 1-4 hours.
- C. 1-6 hours.
- D. 2-10 hours.
Answer: B
NEW QUESTION # 59
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