Fire Protection Systems: MN Sprinkler Fitter Exam
QUESTIONS WITH SOLVED CORRECT ANSWERS.
A glass bulb sprinkler with red liquid in the bulb would be what temperature? -
CORRECT ANSWER✅✅135-170°F (NFPA 13 2025 Edition, Table 7.2.4.1)
A minimum of how many inches shall be maintained between the sprinkler deflector and
the top of a tier of storage? - CORRECT ANSWER✅✅18" (NFPA 13 2025 Edition,
Section 11.1.4)
A pressure tank shall be at least how full? - CORRECT ANSWER✅✅At least ⅔ full
(NFPA 25 2023 Edition, Section 9.3.4.2)
A pump room and valve enclosure must maintain a temperature of what to keep from
freezing. - CORRECT ANSWER✅✅40°F (4°C) or above (NFPA 20 2022 Edition,
Section 4.32.1)
A relief valve on a dry system located between the compressor and control valve shall
be set at _______ psi in excess of maximum air pressure in the system? - CORRECT
ANSWER✅✅10 psi (NFPA 13 2025 Edition, Section 8.1.2.2)
A relief valve shall be set to relieve pressure at what psi? - CORRECT
ANSWER✅✅175 psi or 10 psi over maximum system pressure (NFPA 13 2025 Edition,
Section 8.1.2)
A small room is a compartment having unobstructed construction and a floor area not
exceeding _____ sq. ft. - CORRECT ANSWER✅✅800 (NFPA 13 2025 Edition, Section
3.3.199)
A sprinkler system employing open sprinklers would be classified as what type of
system? - CORRECT ANSWER✅✅Deluge (NFPA 13 2025 Edition, Section 3.3.15)
A sprinkler with blue liquid in the bulb would discharge at what temperature? -
CORRECT ANSWER✅✅225-300°F (NFPA 13 2025 Edition, Table 7.2.4.1)
Acceptance tests required for dry pipe systems - CORRECT ANSWER✅✅Hydro test,
air test, alarm test (NFPA 13 2025 Edition, Chapter 29)
After a dry system has been in service for 3 years, and for every 3 years after, it's
required to have an air test. This can be accomplished in two ways. Either 40 psi for 2
hours and it is allowed to lose 3 psi, or at system working pressure for 4 hours and
,system cannot go into low air condition? - CORRECT ANSWER✅✅40 psi 24 hrs ≤3 psi
loss (NFPA 25 2023 Edition, Section 13.5.1.3)
Air supply entering the freezer area shall be equipped with two supply lines at least 6
feet long and of what diameter pipe? - CORRECT ANSWER✅✅1 inch (NFPA 13 2025
Edition, Section 8.2.3.3)
All sprinkler systems are required to have a system pressure gauge with a minimum
connection of what? - CORRECT ANSWER✅✅1/4" (NFPA 13 2025 Edition, Section
16.13)
All wet systems that do not contain an air reservoir must have a listed relief valve
installed in the system. The relief valve must be set to relieve pressure at 175 psi or
_____ psi above maximum system pressure. - CORRECT ANSWER✅✅10 psi (NFPA
13 2025 Edition, Section 8.1.2)
Although using tie in drains on a dry system is essentially making a gridded dry system,
it is allowed as long as the pipe is ___ inch size and is pitched at a 1/2 inch per 10 feet?
- CORRECT ANSWER✅✅1 inch (NFPA 13 2025 Edition, Section 8.16.2.5.4)
Amount of time for a compressor to fill a dry system? - CORRECT ANSWER✅✅30
minutes (NFPA 13 2025 Edition, Section 8.2.6.3)
An area of low temperature and low combustibility is considered what type of hazard? -
CORRECT ANSWER✅✅Light hazard (NFPA 13 2025 Edition, Section 4.3.1)
Are FDCs required for NFPA 13R systems? - CORRECT ANSWER✅✅Corrected
Answer: Yes, except for systems with less than 20 sprinklers
Corrected Source: NFPA 13R 2022 Edition, Section 6.6.4
Reasoning: FDC required unless the system has less than 20 sprinklers or is in a
single-story building <2000 sq ft. The file is partially correct but incomplete. Verified via
web_search 'NFPA 13R FDC requirements', snippet confirming exceptions.
At what pitch is a ceiling no longer considered sloped? - CORRECT
ANSWER✅✅≤2/12 (NFPA 13 2025 Edition, Section 3.3.22)
Besides the heads going off on a preaction system, what must happen before water
enters the system? - CORRECT ANSWER✅✅Detection system must be activated
(NFPA 13 2025 Edition, Section 8.3.2)
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? - CORRECT ANSWER✅✅8 hours, 2"
diameter (NFPA 22 2023 Edition, Section 14.2.11)
, Ceiling fans ___ inches in diameter are required to be considered an obstruction? -
CORRECT ANSWER✅✅60 (NFPA 13 2025 Edition, Section 13.2.9.1)
Ceiling pockets do not require sprinklers unless they are over ___ cubic foot in size? -
CORRECT ANSWER✅✅1000 (NFPA 13 2025 Edition, Section 9.3.17)
Class ___ standpipe: 1½" connections occupant - CORRECT ANSWER✅✅Class II
(NFPA 14 2022 Edition, Section 4.1.2)
Class ___ standpipe: 2½" connections FD use - CORRECT ANSWER✅✅Class I
(NFPA 14 2022 Edition, Section 4.1.1)
Class ___ standpipe: Both 1½"/2½" - CORRECT ANSWER✅✅Class III (NFPA 14
2022 Edition, Section 4.1.3)
Class I and III standpipes shall be of at least what size? - CORRECT ANSWER✅✅4
inch (NFPA 14 2022 Edition, Section 5.4.1)
Class II standpipe systems are designed for what pressures and flows? - CORRECT
ANSWER✅✅100 gpm @ 65 psi (NFPA 14 2022 Edition, Section 7.6.2)
Class III and Class I standpipe systems are designed for what pressures and flows? -
CORRECT ANSWER✅✅250 gpm @ 100 psi (NFPA 14 2022 Edition, Section 7.6)
Controllers for fire pumps shall be mounted at least how far above the floor? -
CORRECT ANSWER✅✅12" (NFPA 20 2022 Edition, Section 10.5.2.1)
CPVC pipe and fittings should be protected against freezing with what type of system? -
CORRECT ANSWER✅✅Glycerin (NFPA 13 2025 Edition, Section 5.3.3.2)
Distance between support of risers shall not exceed? - CORRECT ANSWER✅✅25
feet (NFPA 13 2025 Edition, Section 18.5.6.4)
Distances of a hose valve location above the floor? - CORRECT ANSWER✅✅3' to 5'
(NFPA 14 2022 Edition, Section 7.3.4)
Dry systems air leakage allowed per week? - CORRECT ANSWER✅✅3 psi max loss
in 24 hrs at 40 psi (NFPA 13 2025 Edition, Section 29.2.1.1)
Duration of water supply for NFPA 13D systems - CORRECT ANSWER✅✅7-10
minutes for one/two-family dwellings (NFPA 13D 2022 Edition, Section 6.5.2)
QUESTIONS WITH SOLVED CORRECT ANSWERS.
A glass bulb sprinkler with red liquid in the bulb would be what temperature? -
CORRECT ANSWER✅✅135-170°F (NFPA 13 2025 Edition, Table 7.2.4.1)
A minimum of how many inches shall be maintained between the sprinkler deflector and
the top of a tier of storage? - CORRECT ANSWER✅✅18" (NFPA 13 2025 Edition,
Section 11.1.4)
A pressure tank shall be at least how full? - CORRECT ANSWER✅✅At least ⅔ full
(NFPA 25 2023 Edition, Section 9.3.4.2)
A pump room and valve enclosure must maintain a temperature of what to keep from
freezing. - CORRECT ANSWER✅✅40°F (4°C) or above (NFPA 20 2022 Edition,
Section 4.32.1)
A relief valve on a dry system located between the compressor and control valve shall
be set at _______ psi in excess of maximum air pressure in the system? - CORRECT
ANSWER✅✅10 psi (NFPA 13 2025 Edition, Section 8.1.2.2)
A relief valve shall be set to relieve pressure at what psi? - CORRECT
ANSWER✅✅175 psi or 10 psi over maximum system pressure (NFPA 13 2025 Edition,
Section 8.1.2)
A small room is a compartment having unobstructed construction and a floor area not
exceeding _____ sq. ft. - CORRECT ANSWER✅✅800 (NFPA 13 2025 Edition, Section
3.3.199)
A sprinkler system employing open sprinklers would be classified as what type of
system? - CORRECT ANSWER✅✅Deluge (NFPA 13 2025 Edition, Section 3.3.15)
A sprinkler with blue liquid in the bulb would discharge at what temperature? -
CORRECT ANSWER✅✅225-300°F (NFPA 13 2025 Edition, Table 7.2.4.1)
Acceptance tests required for dry pipe systems - CORRECT ANSWER✅✅Hydro test,
air test, alarm test (NFPA 13 2025 Edition, Chapter 29)
After a dry system has been in service for 3 years, and for every 3 years after, it's
required to have an air test. This can be accomplished in two ways. Either 40 psi for 2
hours and it is allowed to lose 3 psi, or at system working pressure for 4 hours and
,system cannot go into low air condition? - CORRECT ANSWER✅✅40 psi 24 hrs ≤3 psi
loss (NFPA 25 2023 Edition, Section 13.5.1.3)
Air supply entering the freezer area shall be equipped with two supply lines at least 6
feet long and of what diameter pipe? - CORRECT ANSWER✅✅1 inch (NFPA 13 2025
Edition, Section 8.2.3.3)
All sprinkler systems are required to have a system pressure gauge with a minimum
connection of what? - CORRECT ANSWER✅✅1/4" (NFPA 13 2025 Edition, Section
16.13)
All wet systems that do not contain an air reservoir must have a listed relief valve
installed in the system. The relief valve must be set to relieve pressure at 175 psi or
_____ psi above maximum system pressure. - CORRECT ANSWER✅✅10 psi (NFPA
13 2025 Edition, Section 8.1.2)
Although using tie in drains on a dry system is essentially making a gridded dry system,
it is allowed as long as the pipe is ___ inch size and is pitched at a 1/2 inch per 10 feet?
- CORRECT ANSWER✅✅1 inch (NFPA 13 2025 Edition, Section 8.16.2.5.4)
Amount of time for a compressor to fill a dry system? - CORRECT ANSWER✅✅30
minutes (NFPA 13 2025 Edition, Section 8.2.6.3)
An area of low temperature and low combustibility is considered what type of hazard? -
CORRECT ANSWER✅✅Light hazard (NFPA 13 2025 Edition, Section 4.3.1)
Are FDCs required for NFPA 13R systems? - CORRECT ANSWER✅✅Corrected
Answer: Yes, except for systems with less than 20 sprinklers
Corrected Source: NFPA 13R 2022 Edition, Section 6.6.4
Reasoning: FDC required unless the system has less than 20 sprinklers or is in a
single-story building <2000 sq ft. The file is partially correct but incomplete. Verified via
web_search 'NFPA 13R FDC requirements', snippet confirming exceptions.
At what pitch is a ceiling no longer considered sloped? - CORRECT
ANSWER✅✅≤2/12 (NFPA 13 2025 Edition, Section 3.3.22)
Besides the heads going off on a preaction system, what must happen before water
enters the system? - CORRECT ANSWER✅✅Detection system must be activated
(NFPA 13 2025 Edition, Section 8.3.2)
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? - CORRECT ANSWER✅✅8 hours, 2"
diameter (NFPA 22 2023 Edition, Section 14.2.11)
, Ceiling fans ___ inches in diameter are required to be considered an obstruction? -
CORRECT ANSWER✅✅60 (NFPA 13 2025 Edition, Section 13.2.9.1)
Ceiling pockets do not require sprinklers unless they are over ___ cubic foot in size? -
CORRECT ANSWER✅✅1000 (NFPA 13 2025 Edition, Section 9.3.17)
Class ___ standpipe: 1½" connections occupant - CORRECT ANSWER✅✅Class II
(NFPA 14 2022 Edition, Section 4.1.2)
Class ___ standpipe: 2½" connections FD use - CORRECT ANSWER✅✅Class I
(NFPA 14 2022 Edition, Section 4.1.1)
Class ___ standpipe: Both 1½"/2½" - CORRECT ANSWER✅✅Class III (NFPA 14
2022 Edition, Section 4.1.3)
Class I and III standpipes shall be of at least what size? - CORRECT ANSWER✅✅4
inch (NFPA 14 2022 Edition, Section 5.4.1)
Class II standpipe systems are designed for what pressures and flows? - CORRECT
ANSWER✅✅100 gpm @ 65 psi (NFPA 14 2022 Edition, Section 7.6.2)
Class III and Class I standpipe systems are designed for what pressures and flows? -
CORRECT ANSWER✅✅250 gpm @ 100 psi (NFPA 14 2022 Edition, Section 7.6)
Controllers for fire pumps shall be mounted at least how far above the floor? -
CORRECT ANSWER✅✅12" (NFPA 20 2022 Edition, Section 10.5.2.1)
CPVC pipe and fittings should be protected against freezing with what type of system? -
CORRECT ANSWER✅✅Glycerin (NFPA 13 2025 Edition, Section 5.3.3.2)
Distance between support of risers shall not exceed? - CORRECT ANSWER✅✅25
feet (NFPA 13 2025 Edition, Section 18.5.6.4)
Distances of a hose valve location above the floor? - CORRECT ANSWER✅✅3' to 5'
(NFPA 14 2022 Edition, Section 7.3.4)
Dry systems air leakage allowed per week? - CORRECT ANSWER✅✅3 psi max loss
in 24 hrs at 40 psi (NFPA 13 2025 Edition, Section 29.2.1.1)
Duration of water supply for NFPA 13D systems - CORRECT ANSWER✅✅7-10
minutes for one/two-family dwellings (NFPA 13D 2022 Edition, Section 6.5.2)
