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Practice CWBSP Mock | Practical CWBSP Information
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NFPA Certified Water-Based Systems Professionals Sample Questions (Q35-Q40):
NEW QUESTION # 35
Using the Hazen-Williams formula, determine the friction loss in 150 ft (45.7 m) of 1 in. (25 mm) black steel schedule
40 pipe, flowing 30 gpm (115 lpm) in a wet system.
- A. 52.2 psi (3.6 bar)
- B. 57.9 psi (3.99 bar)
- C. 27.5 psi (1.89 bar)
- D. 41.3 psi (2.93 bar)
Answer: C
Explanation:
Using the Hazen-Williams formula, the friction loss in 150 feet of 1-inch black steel schedule 40 pipe flowing
30 gpm in a wet system would be approximately 27.5 psi. This calculation considers the pipe's material, size, length, and flow rate.
References: The Hazen-Williams formula is commonly used in fire protection engineering to estimate friction loss in water pipes based on material, diameter, flow rate, and length.
NEW QUESTION # 36
To what exponent is the pipe diameter raised when calculating friction loss through a pipe with the Hazen- Williams formula?
- A. 4.52
- B. 1.85
- C. 4.87
- D. 2.31
Answer: C
Explanation:
You can see in the above equation that if Q is raised to the power of 1.85 in the above equation, this has the effect if the flow is doubled and all other factors remain constant, the friction loss would increase by almost four times. If the flow were to triple, the friction loss would almost be nine times greater. You can also see that the pipe diameter D is raised to the power of 4.87 and is in the denominator on the right-hand side of the equation. Therefore any increase in the pipe size will reduce the friction loss if all other factors remain the same. If the diameters double, the friction loss will be reduced by almost a factor of 1/32 likewise, if the pipe diameter is tripled, The friction loss would be reduced to about 1/243 of its original value.
https://canutesoft.com/hydraulic-calculation-for-fire-protection-engineers/the-hazen-williams-formula-for-use- in-fire-sprinkler-systems#:~:text=You%20can%20also%20see%20that,other%20factors%20remain%20the%
20same.
NEW QUESTION # 37
How much pressure is lost to friction as 1,200 gpm (4542 L/min) travels through 200 ft (61 m) of 5 in. (130 mm) schedule 40 steel pipe with a C-factor of 120?
- A. 24 psi (1.65 bar)
- B. 19 psi (1.31 bar)
- C. 21 psi (1.45 bar)
- D. 28 psi (1.9 bar)
Answer: C
Explanation:
The pressure loss due to friction for 1,200 gpm traveling through 200 ft of 5 in. schedule 40 steel pipe with a C-factor of 120 is approximately 21 psi (1.45 bar). This calculation takes into account the flow rate, pipe length, diameter, and roughness factor.
References: Friction loss calculations in fire protection engineering are based on formulas such as the Hazen- Williams equation, which takes into account the flow rate, pipe material (C-factor), diameter, and length.
NEW QUESTION # 38
An existing sprinkler system in a 25 ft (1.5 m) tall building is found to be designed using K-8.0 (115) high temperature control mode density/area (CMDA) sprinklers with a design criteria of 0.35 gpm/ft2 (13.3 mm/min) over
2000 ft2 (186 m2). What is the maximum storage height permitted for double-row rack storage with 8 ft (2.4 m) aisles of a nonencapsulated Class IV commodity?
- A. 18.5 ft (5.6 m)
- B. 16.5 ft (5.0 m)
- C. 20.5 ft (6.2 m)
- D. 15.5 ft (4.7 m)
Answer: B
Explanation:
The maximum storage height permitted for double-row rack storage of a nonencapsulated Class IV commodity with the specified design criteria would likely be around 16.5 feet. This takes into account the density and area coverage required for protecting Class IV commodities.
References: NFPA 13 provides guidelines for storage arrangements, including maximum storage heights and design criteria based on commodity classifications.
NEW QUESTION # 39
When welding is performed on sprinkler piping, which of these shall apply?
- A. Fittings can penetrate the internal diameter of the piping
- B. Steel plates shall be welded to the ends of piping or fittings
- C. Fittings shall be modified
- D. Discs shall be retrieved
Answer: D
Explanation:
When welding is performed on sprinkler piping, it is crucial that discs (or coupons) cut out during the welding process are retrieved. This ensures that the piping system remains clear of obstructions that could impede water flow during a fire event.
References: NFPA 13 and welding standards for piping systems emphasize the importance of maintaining the integrity and clear passage within fire protection piping systems.
NEW QUESTION # 40
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