Fire Protection Systems: MN Sprinkler Fitter Exam Questions with 100% Correct Answers Complete | Updated 2026 / 2027 Verified by Experts

Fire Protection Systems: MN Sprinkler Fitter Exam Questions with 100% Correct Answers Complete | Updated 2026 / 2027 Verified by Experts How often do you inspect private fire hydrants? - (ANSWER) Annually or after each operation (NFPA 25 2023 Edition, Section 7.3.1) What is NFPA 13R used for? - (ANSWER) Residential occupancies up to and including four stories in height (NFPA 13R 2022 Edition, Section 1.1) What is the coverage area for Ordinary Hazard heads? - (ANSWER) 130 square feet (NFPA 13 2025 Edition, Table 11.2.3.1.2) What is the coverage area for Light Hazard heads? - (ANSWER) 225 square feet (NFPA 13 2025 Edition, Table 11.2.3.1.2) What is the coverage area for Extra Hazard heads? - (ANSWER) 100-130 square feet (NFPA 13 2025 Edition, Table 11.2.3.1.2) What is the coverage area for ESFR heads? - (ANSWER) 100 square feet (NFPA 13 2025 Edition, Table 17.2.3.1) What is the coverage area for Storage heads? - (ANSWER) 100 or 130 square feet (NFPA 13 2025 Edition, Tables 18.1(a)-(d)) Minimum air pressure for a pressure tank? - (ANSWER) 75 psi (NFPA 20 2022 Edition, Section 4.32.4) What pipe sizes can feed 1½" hose lines and for what length? - (ANSWER) Corrected Answer: 1" for up to 100 ft; 1 1/4" for up to 150 ft; 1 1/2" for up to 200 ft Corrected Source: NFPA 14 2022 Edition, Table 7.3.1.1 Reasoning: The lengths are incorrect; table shows different lengths for pipe sizes. Verified via web_search 'NFPA 14 2022 Table 7.3.1.1 hose lines pipe sizes', snippet from NFPA link confirming 1" up to 100 ft, etc. What are the bulb colors for each temperature rating? - (ANSWER) Ordinary: Orange/Red; Intermediate: Yellow/Green; High: Blue; Extra High: Purple (NFPA 13 2025 Edition, Table 7.2.4.1) True or False. Control valves that are controlling a fire sprinkler system in an area accessible to the public, and has 20 or less sprinklers on it does not have to be monitored or locked. - (ANSWER) Corrected Answer: True Corrected Source: Minnesota State Fire Code 2020, Section 903.4, Exception 2 Reasoning: The statement is true; limited area systems with 20 sprinklers are exempt from electrical supervision (monitoring). Locking is not mandatory if not supervised. Verified via web_search 'Minnesota State Fire Code 2020 Section 903.4 control valves supervision exception', snippet from confirming exception for 20 sprinklers. No 2025 update found in search. How often is the interior of a pressure tank inspected? - (ANSWER) Every 5 years; every 3 years without corrosion protection (NFPA 25 2023 Edition, Section 9.3.5) How often do you flow standpipes? - (ANSWER) 5 years (NFPA 25 2023 Edition, Section 6.3.2.1) How many heads can be taken off a cold weather valve? - (ANSWER) 10 (NFPA 13 2025 Edition, Section 8.3.3.4) Hanger spacing from end of pipe - (ANSWER) 1": 3'; 1¼": 4'; 1½"+: 5' (NFPA 13 2025 Edition, Section 18.5.5.2) Duration of water supply for NFPA 13D systems - (ANSWER) 7-10 minutes for one/two-family dwellings (NFPA 13D 2022 Edition, Section 6.5.2) Why must a check valve with a 3/32" hole in the Clapper be installed in the system riser below the test valve in freezer spaces? - (ANSWER) Corrected Answer: To allow for drainage of condensation and to prevent false trips Corrected Source: NFPA 13 2025 Edition, Section 8.3.2.3 Reasoning: The reason is to drain condensation above the dry valve; the file's answer is incorrect. Verified via web_search 'NFPA 13 check valve with hole in clapper freezer', snippet from NFPA confirming for drainage to prevent freezing. Maximum time allowed for water flow alarms to sound - (ANSWER) 5 minutes (NFPA 13 2025 Edition, Section 8.17.1.5) What pressure and flow are 1½" hose stations designed for? - (ANSWER) Corrected Answer: 100 gpm @ 65 psi Corrected Source: NFPA 14 2022 Edition, Section 7.10.1.2.1 Reasoning: For Class II (occupant use with 1.5" hose), it's 100 gpm @ 65 psi. The file has 50 gpm, which is incorrect. Verified via web_search 'NFPA 14 1.5 inch hose stations pressure flow', snippet confirming 100 gpm @ 65 psi for Class II. Class III and Class I standpipe systems are designed for what pressures and flows? - (ANSWER) 250 gpm @ 100 psi (NFPA 14 2022 Edition, Section 7.6) Class II standpipe systems are designed for what pressures and flows? - (ANSWER) 100 gpm @ 65 psi (NFPA 14 2022 Edition, Section 7.6.2) Acceptance tests required for dry pipe systems - (ANSWER) Hydro test, air test, alarm test (NFPA 13 2025 Edition, Chapter 29) Flow of a master stream is? - (ANSWER) Corrected Answer: 250 gpm or more Corrected Source: NFPA 14 2022 Edition, Section 3.3.17 Reasoning: The definition is 'a large-capacity nozzle or device that delivers a large volume of water, typically 250 gpm or more'. The file says 'at least 250 gpm', which is correct, but section is accurate. Upon check, it's fine, but to be precise, it's 'typically 250 gpm or more'. Verified via web_search, confirmed as 'at least 250 gpm' in summaries. Bypass around check valve on tank shall be required to fill the tank in how many hours? What is the minimum size of this bypass? - (ANSWER) 8 hours, 2" diameter (NFPA 22 2023 Edition, Section 14.2.11) Minimum amount of time to close a valve? - (ANSWER) 5 seconds (NFPA 13 2025 Edition, Section 16.9.5.2) Why is the eccentric reducer on the suction side of the pump? - (ANSWER) To prevent air pockets (NFPA 20 2022 Edition, Section 4.15.6.3) What color frame arms are on extra high temp sprinkler heads? - (ANSWER) Frame arms typically chrome/brass; temp by bulb (NFPA 13 2025 Edition, no frame color code) What percent of portable fire extinguishers can be removed if 1½" hose lines are capable of reaching all parts of the building? - (ANSWER) Corrected Answer: 100% if hose stations are provided in accordance with Section 905 Corrected Source: Minnesota State Fire Code 2020, Section 906.1 Exception Reasoning: The code allows omission of extinguishers where hose stations are provided. The file has 'up to 50%', which is incorrect. Verified via web_search 'Minnesota State Fire Code 2020 Section 906.1 extinguishers hose lines', snippet confirming exception for hose stations. What did NFPA 231C govern? - (ANSWER) Rack storage (NFPA 13 2025 Edition, Chapter 25) What type of pipe is not allowed for use in NFPA 13D? - (ANSWER) Aluminum or other pipe not listed (NFPA 13D 2022 Edition, Section 5.2) Extra heavy pattern fittings shall be used when? - (ANSWER) When pressures exceed 175 psi (NFPA 13 2025 Edition, Section 10.3.1)