Minnesota Journeyman Sprinkler Fitter
Examination Questions and Answers (2026) |
Devon’s Cheat Sheet + Previous Test Reviews |
Complete Exam Prep Guide
MINNESOTA JOURNEYMAN SPRINKLER FITTER EXAMINATION
Question 1: You are installing a wet-pipe sprinkler system in a light hazard office building. The
system designer specifies a design density of 0.10 gpm/ft². According to NFPA 13, what is the
minimum design area you must use for this occupancy?
A. 1,000 sq ft B. 1,500 sq ft ✓ CORRECT C. 2,000 sq ft D. 1,200 sq ft E. 750 sq ft
RATIONALE: NFPA 13 requires a minimum design area of 1,500 sq ft for light hazard
occupancies at a density of 0.10 gpm/ft². This ensures adequate water is supplied across a
realistic fire scenario.
Question 2: During a field inspection, you notice that a sprinkler head is installed within 4
inches of a fluorescent light fixture in an ordinary hazard warehouse. What is the correct action?
A. Leave it as-is since the fixture is not combustible B. Relocate the sprinkler head per NFPA
13 obstruction rules ✓ CORRECT C. Add a shield between the head and the fixture D.
Increase the orifice size of the sprinkler E. Install a heat deflector above the fixture
RATIONALE: NFPA 13 obstruction rules require sprinklers to be positioned so that
discharges are not impeded. Fixtures within 18 inches laterally or below the deflector plane can
obstruct spray patterns and require relocation.
Question 3: A Minnesota contractor is installing a dry-pipe system in a freezer warehouse. What
is the maximum permitted time from full valve opening to water delivery at the inspector's test
connection?
A. 30 seconds B. 45 seconds C. 60 seconds ✓ CORRECT D. 90 seconds E. 120 seconds
RATIONALE: NFPA 13 requires that dry-pipe systems deliver water to the most remote
inspector's test connection within 60 seconds of the dry-pipe valve opening.
,Question 4: You are sizing a feed main in an ordinary hazard Group 1 building with a demand of
225 gpm at 50 psi residual over 150 feet. What pipe size would you select for Schedule 40 steel
pipe?
A. 2-inch B. 2.5-inch C. 3-inch ✓ CORRECT D. 4-inch E. 3.5-inch
RATIONALE: For 225 gpm over 150 feet with a 50 psi residual requirement, a 3-inch
Schedule 40 steel pipe keeps friction losses within acceptable limits under Hazen-Williams
calculations.
Question 5: A sprinkler fitter is working on a pre-action system protecting a server room. The
system requires two independent signals to open the pre-action valve. What type of pre-action
system is this?
A. Single interlock pre-action system B. Non-interlock pre-action system C. Double interlock
pre-action system ✓ CORRECT D. Deluge system with pre-action trim E. Cycling system
RATIONALE: A double interlock pre-action system requires two independent events —
typically detection activation AND a sprinkler opening — before water enters the piping, making
it the safest choice for water-sensitive environments like server rooms.
Question 6: On a hydraulically designed system, the static pressure is 80 psi and the residual
pressure is 65 psi at a flow of 1,000 gpm. What is the available flow at 20 psi residual?
A. 1,450 gpm B. 1,850 gpm ✓ CORRECT C. 2,100 gpm D. 2,400 gpm E. 1,200 gpm
RATIONALE: Using the N^1.85 flow projection formula from the water supply curve,
projecting from the test point of 1,000 gpm @ 65 psi residual down to 20 psi residual yields
approximately 1,850 gpm available.
Question 7: You are installing a residential sprinkler system in a Minnesota single-family home
under NFPA 13D. What is the maximum floor area per sprinkler permitted?
A. 144 sq ft B. 196 sq ft C. 256 sq ft D. 400 sq ft ✓ CORRECT E. 324 sq ft
RATIONALE: NFPA 13D allows a maximum coverage area of up to 400 sq ft per sprinkler
in dwelling units when listed for extended coverage.
,Question 8: What is the minimum operating pressure specified by NFPA 13 for standard spray
sprinklers?
A. 5 psi B. 7 psi ✓ CORRECT C. 10 psi D. 12 psi E. 15 psi
RATIONALE: NFPA 13 requires a minimum of 7 psi at any sprinkler for standard spray
sprinklers to ensure adequate water discharge and spray pattern formation.
Question 9: If no accelerator is installed on a dry-pipe system, what is the maximum system
volume per NFPA 13?
A. 250 gallons B. 500 gallons ✓ CORRECT C. 750 gallons D. 1,000 gallons E. 1,500 gallons
RATIONALE: NFPA 13 limits dry-pipe systems without accelerators to 500 gallons of pipe
volume. Systems exceeding this require an accelerator or exhauster to meet the 60-second water
delivery requirement.
Question 10: NFPA 13 requires sprinklers under a solid obstruction if the obstruction is wider
than:
A. 2 feet wide B. 3 feet wide C. 4 feet wide ✓ CORRECT D. 18 inches wide E. No minimum
— all obstructions require under-sprinklers
RATIONALE: NFPA 13 requires sprinklers below solid obstructions that are more than 4
feet wide if the obstruction is more than 18 inches below the ceiling sprinkler deflectors.
Question 11: What is the minimum hydrostatic test pressure and duration per NFPA 13?
A. 100 psi for 1 hour B. 150 psi for 2 hours C. 200 psi for 1 hour D. 200 psi for 2 hours ✓
CORRECT E. 250 psi for 30 minutes
RATIONALE: NFPA 13 requires a hydrostatic test at 200 psi sustained for 2 hours with no
leakage.
Question 12: What is the typical concern with old-style sprinklers regarding a 15-year
renovation project?
, A. They are incompatible with modern alarm valves B. They may require replacement due to
corrosion susceptibility ✓ CORRECT C. NFPA 13 mandates replacement of all pre-1920
sprinklers D. They are no longer rated for any hazard classification E. They require individual
pressure gauges
RATIONALE: Old-style sprinklers may have material or performance issues. NFPA 25
recommends that sprinklers showing signs of corrosion or 50-year service should be replaced.
Question 13: A Minnesota warehouse stores rolled paper goods in 15-foot piles on racks. Which
NFPA 13 hazard classification applies?
A. Light Hazard B. Ordinary Hazard Group 1 C. Ordinary Hazard Group 2 D. Extra Hazard
Group 1 E. Extra Hazard Group 2 ✓ CORRECT
RATIONALE: High-piled storage of paper products on racks is classified as Extra Hazard
Group 2 under NFPA 13, requiring higher design densities and possibly in-rack sprinklers.
Question 14: NFPA 13 requires standard sidewall sprinkler deflectors to be within what distance
from the ceiling?
A. 4 to 6 inches B. 4 to 12 inches ✓ CORRECT C. 6 to 18 inches D. 4 to 18 inches E. 6 to 12
inches
RATIONALE: NFPA 13 requires standard sidewall sprinklers to have deflectors positioned
4 to 6 inches from the ceiling to produce the required spray pattern.
Question 15: In a Minnesota restaurant kitchen with deep fat fryers, what special consideration
applies?
A. No special consideration; standard OH2 coverage applies B. High-temperature sprinklers
(286°F or higher) must be used ✓ CORRECT C. Only dry-type sprinkler systems are
permitted D. A pre-action system is mandatory E. Sprinklers are exempt if a hood suppression
system exists
RATIONALE: NFPA 13 requires high-temperature rated sprinklers (286°F or higher) in
areas subject to elevated ambient temperatures such as commercial kitchen cooking equipment
areas to prevent premature activation.
Examination Questions and Answers (2026) |
Devon’s Cheat Sheet + Previous Test Reviews |
Complete Exam Prep Guide
MINNESOTA JOURNEYMAN SPRINKLER FITTER EXAMINATION
Question 1: You are installing a wet-pipe sprinkler system in a light hazard office building. The
system designer specifies a design density of 0.10 gpm/ft². According to NFPA 13, what is the
minimum design area you must use for this occupancy?
A. 1,000 sq ft B. 1,500 sq ft ✓ CORRECT C. 2,000 sq ft D. 1,200 sq ft E. 750 sq ft
RATIONALE: NFPA 13 requires a minimum design area of 1,500 sq ft for light hazard
occupancies at a density of 0.10 gpm/ft². This ensures adequate water is supplied across a
realistic fire scenario.
Question 2: During a field inspection, you notice that a sprinkler head is installed within 4
inches of a fluorescent light fixture in an ordinary hazard warehouse. What is the correct action?
A. Leave it as-is since the fixture is not combustible B. Relocate the sprinkler head per NFPA
13 obstruction rules ✓ CORRECT C. Add a shield between the head and the fixture D.
Increase the orifice size of the sprinkler E. Install a heat deflector above the fixture
RATIONALE: NFPA 13 obstruction rules require sprinklers to be positioned so that
discharges are not impeded. Fixtures within 18 inches laterally or below the deflector plane can
obstruct spray patterns and require relocation.
Question 3: A Minnesota contractor is installing a dry-pipe system in a freezer warehouse. What
is the maximum permitted time from full valve opening to water delivery at the inspector's test
connection?
A. 30 seconds B. 45 seconds C. 60 seconds ✓ CORRECT D. 90 seconds E. 120 seconds
RATIONALE: NFPA 13 requires that dry-pipe systems deliver water to the most remote
inspector's test connection within 60 seconds of the dry-pipe valve opening.
,Question 4: You are sizing a feed main in an ordinary hazard Group 1 building with a demand of
225 gpm at 50 psi residual over 150 feet. What pipe size would you select for Schedule 40 steel
pipe?
A. 2-inch B. 2.5-inch C. 3-inch ✓ CORRECT D. 4-inch E. 3.5-inch
RATIONALE: For 225 gpm over 150 feet with a 50 psi residual requirement, a 3-inch
Schedule 40 steel pipe keeps friction losses within acceptable limits under Hazen-Williams
calculations.
Question 5: A sprinkler fitter is working on a pre-action system protecting a server room. The
system requires two independent signals to open the pre-action valve. What type of pre-action
system is this?
A. Single interlock pre-action system B. Non-interlock pre-action system C. Double interlock
pre-action system ✓ CORRECT D. Deluge system with pre-action trim E. Cycling system
RATIONALE: A double interlock pre-action system requires two independent events —
typically detection activation AND a sprinkler opening — before water enters the piping, making
it the safest choice for water-sensitive environments like server rooms.
Question 6: On a hydraulically designed system, the static pressure is 80 psi and the residual
pressure is 65 psi at a flow of 1,000 gpm. What is the available flow at 20 psi residual?
A. 1,450 gpm B. 1,850 gpm ✓ CORRECT C. 2,100 gpm D. 2,400 gpm E. 1,200 gpm
RATIONALE: Using the N^1.85 flow projection formula from the water supply curve,
projecting from the test point of 1,000 gpm @ 65 psi residual down to 20 psi residual yields
approximately 1,850 gpm available.
Question 7: You are installing a residential sprinkler system in a Minnesota single-family home
under NFPA 13D. What is the maximum floor area per sprinkler permitted?
A. 144 sq ft B. 196 sq ft C. 256 sq ft D. 400 sq ft ✓ CORRECT E. 324 sq ft
RATIONALE: NFPA 13D allows a maximum coverage area of up to 400 sq ft per sprinkler
in dwelling units when listed for extended coverage.
,Question 8: What is the minimum operating pressure specified by NFPA 13 for standard spray
sprinklers?
A. 5 psi B. 7 psi ✓ CORRECT C. 10 psi D. 12 psi E. 15 psi
RATIONALE: NFPA 13 requires a minimum of 7 psi at any sprinkler for standard spray
sprinklers to ensure adequate water discharge and spray pattern formation.
Question 9: If no accelerator is installed on a dry-pipe system, what is the maximum system
volume per NFPA 13?
A. 250 gallons B. 500 gallons ✓ CORRECT C. 750 gallons D. 1,000 gallons E. 1,500 gallons
RATIONALE: NFPA 13 limits dry-pipe systems without accelerators to 500 gallons of pipe
volume. Systems exceeding this require an accelerator or exhauster to meet the 60-second water
delivery requirement.
Question 10: NFPA 13 requires sprinklers under a solid obstruction if the obstruction is wider
than:
A. 2 feet wide B. 3 feet wide C. 4 feet wide ✓ CORRECT D. 18 inches wide E. No minimum
— all obstructions require under-sprinklers
RATIONALE: NFPA 13 requires sprinklers below solid obstructions that are more than 4
feet wide if the obstruction is more than 18 inches below the ceiling sprinkler deflectors.
Question 11: What is the minimum hydrostatic test pressure and duration per NFPA 13?
A. 100 psi for 1 hour B. 150 psi for 2 hours C. 200 psi for 1 hour D. 200 psi for 2 hours ✓
CORRECT E. 250 psi for 30 minutes
RATIONALE: NFPA 13 requires a hydrostatic test at 200 psi sustained for 2 hours with no
leakage.
Question 12: What is the typical concern with old-style sprinklers regarding a 15-year
renovation project?
, A. They are incompatible with modern alarm valves B. They may require replacement due to
corrosion susceptibility ✓ CORRECT C. NFPA 13 mandates replacement of all pre-1920
sprinklers D. They are no longer rated for any hazard classification E. They require individual
pressure gauges
RATIONALE: Old-style sprinklers may have material or performance issues. NFPA 25
recommends that sprinklers showing signs of corrosion or 50-year service should be replaced.
Question 13: A Minnesota warehouse stores rolled paper goods in 15-foot piles on racks. Which
NFPA 13 hazard classification applies?
A. Light Hazard B. Ordinary Hazard Group 1 C. Ordinary Hazard Group 2 D. Extra Hazard
Group 1 E. Extra Hazard Group 2 ✓ CORRECT
RATIONALE: High-piled storage of paper products on racks is classified as Extra Hazard
Group 2 under NFPA 13, requiring higher design densities and possibly in-rack sprinklers.
Question 14: NFPA 13 requires standard sidewall sprinkler deflectors to be within what distance
from the ceiling?
A. 4 to 6 inches B. 4 to 12 inches ✓ CORRECT C. 6 to 18 inches D. 4 to 18 inches E. 6 to 12
inches
RATIONALE: NFPA 13 requires standard sidewall sprinklers to have deflectors positioned
4 to 6 inches from the ceiling to produce the required spray pattern.
Question 15: In a Minnesota restaurant kitchen with deep fat fryers, what special consideration
applies?
A. No special consideration; standard OH2 coverage applies B. High-temperature sprinklers
(286°F or higher) must be used ✓ CORRECT C. Only dry-type sprinkler systems are
permitted D. A pre-action system is mandatory E. Sprinklers are exempt if a hood suppression
system exists
RATIONALE: NFPA 13 requires high-temperature rated sprinklers (286°F or higher) in
areas subject to elevated ambient temperatures such as commercial kitchen cooking equipment
areas to prevent premature activation.
