NFPA Certified Water-Based Systems Professionals Exam Practice Test
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Question 1
When field acceptance testing a fire pump with a variable speed pressure limiting control, the pump shall be tested in
variable speed mode at
Answer : B
When field acceptance testing a fire pump with variable speed pressure limiting control, the pump should be tested in variable speed mode at no flow, 100%, and 150% of rated load to fully evaluate its performance under different demand conditions.
Question 2
An 8 in. (200 mm) Schedule 40 steel main is to be supported from a trapeze hanger. The trapeze hanger is to span between two joists which are 7.5 ft (2.3 m) apart. What is the minimum size of steel pipe the trapeze member is to be made of?
Answer : B
For an 8 in. Schedule 40 steel main supported from a trapeze hanger with a 7.5 ft span, a 3 in. Schedule 40 steel pipe for the trapeze member provides sufficient strength and support for the weight of the main and the water it contains.
Question 3
In a three-story apartment building protected with an NFPA 13R system utilizing quick-response sprinklers, the minimum density/area requirement shall be?
Answer : B
In a three-story apartment building protected with an NFPA 13R system utilizing quick-response sprinklers, the minimum density/area requirement is typically 0.10 gpm/ft. This density ensures adequate coverage for residential occupancies with a moderate level of combustibles.
Question 4
How much pressure is lost due to elevation in water flowing in a pipe from 6 ft (1.8 m) high to 15 ft (4.6 m) high?
Answer : B
The pressure lost due to elevation in water flowing from 6 ft to 15 ft high is approximately 3.897 psi, calculated based on the height difference and the principle that each foot of elevation change results in a pressure change of 0.433 psi.
Question 5
The minimum design criteria for the design of a new sprinkler system in a residential occupancy, with noncombustible concealed spaces, in an NFPA 13 based design is how many residential sprinklers and what density?
Answer : C
The minimum design criteria for a new sprinkler system in a residential occupancy, considering noncombustible concealed spaces and based on NFPA 13, would typically involve 4 sprinklers at a density of 0.10 gpm/ft. This provides a baseline level of fire protection suitable for residential settings.
Question 6
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.
Four sprinklers are in a 460 ft2 (42.7 m2) room of ordinary hazard, Group 1 occupancy. Each sprinkler coverage area
is 120 ft2 (11.1 m2). What is the minimum water required from each flowing sprinkler?
Answer : C
For four sprinklers in a 460 ft room of ordinary hazard, Group 1 occupancy, with each sprinkler covering an area of 120 ft, the minimum water required from each flowing sprinkler would be approximately 20 gpm, ensuring adequate coverage and density for the hazard classification.
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