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NFPA CFPS Exam - Topic 4 Question 13 Discussion

Actual exam question for NFPA's CFPS exam
Question #: 13
Topic #: 4
[All CFPS Questions]

The typical discharge coefficient of a solid stream nozzle for a standard orifice with sharp edges is?

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Suggested Answer: A

. 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.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


by Irma at Jul 14, 2025, 02:36 AM

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Rosann
2 months ago
0.95 seems way too high for a sharp edge orifice!
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Tu
2 months ago
I thought it was higher, like 0.75?
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Becky
3 months ago
Totally agree, 0.62 is the standard!
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Kathrine
3 months ago
Wait, are you sure it's not 0.8? That sounds more right.
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Chantell
3 months ago
It's usually around 0.62 for sharp edge orifices.
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Sena
3 months ago
I’m leaning towards 0.95, but I can't recall if that applies to a different type of nozzle.
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Alpha
4 months ago
I feel like 0.8 is too high for a sharp-edged nozzle. I might go with 0.62 since it sounds more familiar.
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Mohammad
4 months ago
I remember practicing a similar question, and I think 0.75 was mentioned, but that seems a bit high for a standard orifice.
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Jordan
4 months ago
I think the typical discharge coefficient for a sharp-edged orifice is around 0.62, but I'm not completely sure.
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Sonia
4 months ago
This seems straightforward. The discharge coefficient for a sharp-edged orifice is usually around 0.62, so I'm confident that A is the correct answer.
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Salena
4 months ago
I'm a bit unsure about this one. I know the discharge coefficient depends on the geometry of the orifice, but I can't quite recall the typical value for a sharp-edged orifice. I'll have to think it through carefully.
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Josefa
5 months ago
Okay, I think I know this one. The discharge coefficient is usually lower for sharp-edged orifices compared to rounded ones, so I'm going to go with A - 0.62.
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Yuonne
5 months ago
Hmm, this looks like a fluid mechanics question. I'll need to remember the formula for discharge coefficient and think about how the sharp edges of the orifice would affect it.
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Geraldine
7 months ago
I'm not sure, but I think it's B) 0.75.
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Merri
7 months ago
I remember reading that the typical discharge coefficient is D) 0.95.
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Casandra
7 months ago
I disagree, I believe it's C) 0.8.
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Joye
7 months ago
I think it's A) 0.62.
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Elenora
7 months ago
Ah, the joys of fluid dynamics. It's like trying to herd cats, but with water instead of felines. I'm feeling bold, so I'll go with D. Who knows, maybe I'll surprise myself.
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Herman
6 months ago
User 2: I'm feeling bold too, I'll choose D) 0.95
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Vernice
6 months ago
User 1: I'll go with A) 0.62
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Yuriko
7 months ago
Discharge coefficients, the bane of every engineering student's existence. But hey, at least we get to play with water and pretend it's work! I'll go with B, just to keep things interesting.
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Gianna
7 months ago
Ah, the age-old question of discharge coefficients. If only we could discharge our exams as easily as water through a nozzle, am I right? I'm going to have to go with C on this one.
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Rikki
7 months ago
Hmm, I remember learning about discharge coefficients in my fluid mechanics class. If I recall correctly, the sharp-edged orifice should have a lower coefficient than a rounded one. I'm going to go with option A.
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Celia
6 months ago
I agree, let's go with option A.
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Glen
6 months ago
I think you're right, option A seems like the correct choice.
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