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NEW QUESTION # 134
The fuel storage tank for a diesel driven fire pump should be sized to contain a supply for at least:
Answer: D
Explanation:
NEW QUESTION # 135
Which spacing multiplier is used for heat detectors installed in a building with a ceiling that is 15 ft (5 m) high?
Answer: A
Explanation:
NEW QUESTION # 136
In a detention or correctional facility, the following would be what type of restraint or locking system?
Free movement is restricted from a occupied space. Remote control release is provided to permit movement from all sleeping rooms, activity spaces, and other occupied area within the smoke compartment to other smoke compartments.
Answer: D
NEW QUESTION # 137
What are the two classes of fire models?
Answer: A
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 # 138
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?
Answer: C
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 # 139
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