NFPA CWBSP Certified Water-Based Systems Professionals Exam Practice Test

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Total 100 questions
Question 1

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?



Answer : C

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.


Question 2

A restaurant service area has an 18 ft (5.5 m) high T-Bar ceiling throughout. Using quick-response sprinklers in a wet

sprinkler system, what is the minimum area and density that should be calculated?



Answer : D

In a restaurant service area with an 18 ft high T-Bar ceiling and using quick-response sprinklers in a wet system, the minimum area and density that should be calculated is typically 0.15 gpm over 1,080 ft (6.1 mm/min over 100.3 m), considering the ceiling height and occupancy.


Question 3

What is the maximum pressure rating when using standard weight pattern malleable iron fittings that are 6 in. (150 mm) in size and smaller?



Answer : C

Standard weight pattern malleable iron fittings that are 6 inches in size and smaller typically have a maximum pressure rating of 300 psi (21 bar). This rating ensures that the fittings can withstand the pressure demands of most fire sprinkler systems without failure.


Question 4

Where must a diesel engine driven fire pump's fuel tank be located for areas subject to temperatures below 32F (0)?



Answer : A

The fuel tank for a diesel engine-driven fire pump must be located in the same room as the fire pump, especially in areas subject to freezing temperatures, to ensure that the diesel fuel remains at a usable temperature and the pump is readily available for operation during an emergency.


Question 5

To what exponent is the pipe diameter raised when calculating friction loss through a pipe with the Hazen-Williams formula?



Answer : D

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.


Question 6

What standard applies for underground malleable iron threaded fittings of Class 150?



Answer : B

ASME B16.3 is the standard that applies to malleable iron threaded fittings of Class 150, which are commonly used in piping systems, including those for fire protection. This standard covers dimensions, tolerances, and material requirements for these types of fittings.


Question 7

What is the minimum design criteria to protect an exposed nonexpanded Group A plastic stored in a solid pile to a maximum height of 15 ft (4.6 m) in a 26 ft (7.9 m) high building? Piles to be stable with closed arrays.



Answer : A

To protect exposed nonexpanded Group A plastic stored in a solid pile up to 15 ft high, a design criteria of 0.70 gpm/ft over 2000 ft is typically required. This density and area coverage account for the high combustibility and potential heat release of Group A plastics.


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Total 100 questions