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Exam CFPS Topic 4 Question 69 Discussion

Actual exam question for NFPA's CFPS exam
Question #: 69
Topic #: 4
The minimum carbon dioxide design concentration for extinguishment of an ethylene fire is

Suggested Answer: C Vote an answer

Explanation
The minimum carbon dioxide design concentration for extinguishment of an ethylene fire is43%. This is based on the cup burner method, which is a standard test to determine the flame extinguishing concentration of a gaseous agent for a liquid fuel. Ethylene is a flammable gas that can form a liquid under pressure. The cup burner method involves placing a liquid fuel in a metal cup with a central nozzle, and flowing a gaseous agent through the nozzle to create a diffusion flame. The gaseous agent is gradually increased until the flame is extinguished.The minimum concentration of the gaseous agent required to extinguish the flame is recorded as the flame extinguishing concentration1.According to a study by NIST, the flame extinguishing concentration of carbon dioxide for ethylene was found to be 43%1.This value is also consistent with the NFPA 12 standard, which specifies the minimum design concentrations of carbon dioxide for various fuels, including ethylene2.

by aravind at Feb 27, 2024, 07:54 PM

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aravind
2024-02-27 19:55:46
Selected Answer: D
For Ethylene fire CO2 design concentration is 49%.
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aravind
2024-02-27 19:54:51
As per Table 17.1.1 of NFPA Handbook (17-5) min design CO2 concentration is 49%.
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Here are all the actual test exam dumps for IT exams. Most people prepare for the actual exams with our test dumps to pass their exams. So it's critical to choose and actual test pdf to succeed.

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