Minnesota Journeyman Sprinkler Fitter Examination – Minnesota Licensing Exam Prep, 2026/2027 – Combined Practice Questions, Cheat Sheet, and Test Reviews

MINNESOTA JOURNEYMAN SPRINKLER FITTER

Question 1
What is the maximum allowable coverage area for Early Suppression Fast Response (ESFR)
sprinkler heads?
A) 80 sq ft
B) 90 sq ft
C) 100 sq ft
D) 130 sq ft
E) 150 sq ft
Correct Answer: C) 100 sq ft
Rationale: According to NFPA 13 standards for high-challenge storage environments, ESFR
sprinklers are generally limited to a maximum coverage area of 100 square feet to ensure
the high-momentum water discharge is sufficient to suppress a fire rapidly.

Question 2
What is the standard coverage area for "Storage" sprinkler heads?
A) 80 sq ft or 100 sq ft
B) 100 sq ft or 130 sq ft
C) 130 sq ft or 150 sq ft
D) 150 sq ft or 200 sq ft
E) 225 sq ft only
Correct Answer: B) 100 sq ft or 130 sq ft
Rationale: The coverage area for storage sprinklers depends on the density and the specific
listing of the head; however, standard NFPA 13 applications typically cap these at 100 sq ft
for high-density applications or 130 sq ft under specific hydraulic conditions.

Question 3
What is the minimum required air pressure that must be maintained in a pressure tank?
A) 50 psi
B) 60 psi
C) 75 psi
D) 100 psi
E) 175 psi
Correct Answer: C) 75 psi
Rationale: Pressure tanks serve as a primary water supply in certain configurations and
must maintain a minimum air pressure of 75 psi to ensure adequate discharge pressure is
available to the system upon activation.

Question 4
When feeding 1½" hose lines from a main, what is the requirement for the connecting pipe size
for a horizontal run of 50 feet?
A) 1" diameter

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B) 1¼" diameter
C) 1½" diameter
D) 2" diameter
E) 2½" diameter
Correct Answer: B) 1¼" diameter
Rationale: NFPA standards specify that for 1½" hose lines, the feed pipe must be 1" for runs
up to 20', 1¼" for runs between 20' and 80', and 1½" for runs exceeding 80'. All must be
connected to a main at least 2½" in diameter.

Question 5
An "Ordinary" temperature-rated sprinkler head is identified by which bulb color(s)?
A) Yellow or Green
B) Blue
C) Purple
D) Orange or Red
E) Black
Correct Answer: D) Orange or Red
Rationale: Sprinkler head temperature ratings are color-coded for quick identification.
Orange or Red indicates an "Ordinary" rating, typically ranging from 135°F to 170°F.

Question 6
A sprinkler head with a "High" temperature rating will have which bulb color?
A) Red
B) Yellow
C) Green
D) Blue
E) Purple
Correct Answer: D) Blue
Rationale: The Blue bulb indicates a "High" temperature rating (250°F to 300°F), which is
required in areas where ambient ceiling temperatures are higher than normal, such as near
boilers or industrial heaters.

Question 7
How often must the interior of a pressure tank without corrosion protection be inspected?
A) Annually
B) Every 2 years
C) Every 3 years
D) Every 5 years
E) Every 10 years
Correct Answer: C) Every 3 years
Rationale: NFPA 25 requires that the interior of all pressure tanks be inspected every 5

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years; however, if the tank does not have an approved anti-corrosion coating, the inspection
frequency is increased to every 3 years to ensure structural integrity.

Question 8
In accordance with NFPA 25, how often must a full flow test be conducted on standpipe
systems?
A) Annually
B) Every 2 years
C) Every 3 years
D) Every 5 years
E) Every 10 years
Correct Answer: D) Every 5 years
Rationale: A hydrostatic test and flow test of the standpipe system is required every 5 years
to ensure the piping can handle the required pressure and that there are no obstructions
preventing the required flow.

Question 9
What is the maximum number of sprinkler heads that can be controlled by a single cold weather
valve?
A) 5
B) 10
C) 15
D) 20
E) 25
Correct Answer: B) 10
Rationale: Cold weather valves are used to drain small sections of a wet system exposed to
freezing. NFPA 13 limits the number of heads on such a valve to 10 to minimize the
complexity and potential failure area of the system.

Question 10
For a 1" steel pipe, what is the required hanger spacing from the end of the pipe?
A) 1 foot
B) 2 feet
C) 3 feet
D) 4 feet
E) 5 feet
Correct Answer: C) 3 feet
Rationale: To ensure the structural stability of the piping, 1" pipe requires a hanger within
3 feet of the end. As pipe size increases (1¼" to 4', 1½" and up to 5'), the allowable distance
increases due to the greater rigidity of the larger pipe.

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Question 11
For an NFPA 13D system (one- and two-family dwellings), the water supply must be capable of
supporting the system demand for how long?
A) 5 minutes
B) 10 minutes
C) 30 minutes
D) 60 minutes
E) 90 minutes
Correct Answer: B) 10 minutes
Rationale: NFPA 13D systems are designed for life safety and to allow occupants to escape.
A 10-minute water supply duration is considered sufficient for these residential occupancies
to meet that goal.
Question 12
Why is a check valve with a 3/32" hole in the clapper required below the test valve in freezer
spaces?
A) To allow for system drainage
B) To increase air pressure
C) To prevent evaporation of priming water into the system
D) To allow for easier hydrostatic testing
E) To prevent the clapper from sticking
Correct Answer: C) To prevent evaporation of priming water into the system
Rationale: In freezer systems, maintaining the water-to-air interface is critical. The small
hole in the clapper allows for pressure equalization while preventing the priming water
from evaporating into the dry portion of the system, which could lead to ice blockages.

Question 13
What is the maximum time allowed for water flow alarms to sound after water starts flowing in a
system?
A) 30 seconds
B) 60 seconds
C) 90 seconds
D) 2 minutes
E) 5 minutes
Correct Answer: E) 5 minutes
Rationale: While local water flow alarms usually activate much faster, the maximum legal
limit for the alarm to be fully functional and sounding after continuous flow is 5 minutes.

Question 14
1½" hose stations are required to be designed for what specific flow and pressure?
A) 50 gpm at system pressure