MINNESOTA JOURNEYMAN SPRINKLER FITTER EXAM 2026
| NFPA 13/25 & Minnesota Amendments | Combined Test
Review | Complete Practice Set | Pass Guaranteed - A+
Graded
[Section 1: NFPA 13 - System Types, Components & Installation Requirements
(Q1-28)]
Q1. A wet pipe sprinkler system is being installed in a light hazard office occupancy.
Which statement correctly describes the primary operational characteristic of this
system?
A. Water is held back by a dry pipe valve and air pressure
B. Water is constantly maintained in the piping network up to the sprinklers
C. Water is released only after a detection system activates
D. Air is maintained in the piping at all times to prevent freezing
B. Water is constantly maintained in the piping network up to the sprinklers [CORRECT]
Rationale: A wet pipe system maintains water in the piping at all times, allowing
immediate discharge upon sprinkler activation; A describes a dry pipe system, C
describes a preaction/deluge system, and D describes a dry pipe or antifreeze system.
Correct Answer: B
Q2. A dry pipe valve operates on the differential principle. If the water supply pressure is
100 psi and the valve has a 5:1 differential ratio, what is the maximum air pressure that
can be maintained in the system without tripping the valve?
A. 20 psi
B. 25 psi
C. 100 psi
D. 500 psi
A. 20 psi [CORRECT]
,Rationale: With a 5:1 differential ratio, the maximum air pressure equals water pressure
divided by 5 (100 ÷ 5 = 20 psi); maintaining air pressure below this threshold prevents
nuisance tripping while allowing reliable operation upon sprinkler activation.
Correct Answer: A
Q3. A double interlock preaction system is being installed in a museum with valuable
artifacts. Which sequence correctly describes the activation requirements?
A. Sprinkler operation only
B. Detection system activation only
C. Both detection system activation AND sprinkler operation
D. Either detection system activation OR sprinkler operation
C. Both detection system activation AND sprinkler operation [CORRECT]
Rationale: Double interlock preaction systems require both a detection system alarm
AND individual sprinkler operation before water enters the piping, providing maximum
protection against accidental discharge; single interlock requires only detection, while A
and D describe deluge or wet pipe operation.
Correct Answer: C
Q4. A deluge system is protecting an aircraft hangar with foam-water sprinklers. What is
the primary activation mechanism for this system?
A. Individual heat-responsive sprinkler heads
B. A detection system that opens the deluge valve simultaneously flooding all sprinklers
C. Manual activation at the riser only
D. Air pressure drop in the piping network
B. A detection system that opens the deluge valve simultaneously flooding all sprinklers
[CORRECT]
Rationale: Deluge systems use open sprinklers or nozzles and are activated by a
detection system (electric, pneumatic, or hydraulic) that opens the deluge valve,
,simultaneously discharging water through all devices; A describes wet/dry systems, C is
incomplete, and D describes dry pipe activation.
Correct Answer: B
Q5. An antifreeze system is being installed to protect a small unheated vestibule in
Minnesota. Which antifreeze solution concentration requirement is correct per NFPA
13?
A. Any concentration of propylene glycol is acceptable
B. The solution must be mixed to provide freeze protection at least 10°F below the
lowest expected temperature
C. Only glycerin-based solutions are permitted in new systems
D. The solution concentration does not require testing after initial fill
B. The solution must be mixed to provide freeze protection at least 10°F below the
lowest expected temperature [CORRECT]
Rationale: NFPA 13 requires antifreeze solutions to be mixed to provide freeze
protection at least 10°F below the lowest expected ambient temperature to ensure
reliable operation; A is incorrect due to concentration limits, C is incorrect as propylene
glycol is permitted, and D violates ITM requirements.
Correct Answer: B
Q6. A Class III standpipe system is being installed in a high-rise building in Minneapolis.
Which hose connection and water supply configuration is correct?
A. 1.5-inch hose connections for trained personnel only, supplied by the fire department
pumper truck exclusively
B. 2.5-inch connections for fire department use and 1.5-inch connections with hose
racks for occupant use, supplied by building fire pump
C. 1-inch garden hose connections for building maintenance staff
D. 4-inch connections for standpipe use only with no hose attached
B. 2.5-inch connections for fire department use and 1.5-inch connections with hose
racks for occupant use, supplied by building fire pump [CORRECT]
, Rationale: Class III standpipes combine Class I (2.5-inch for fire department) and Class
II (1.5-inch with hose racks for trained occupants), supplied by a building fire pump or
city water; A describes Class I only, C is not a standpipe classification, and D is not
standard.
Correct Answer: B
Q7. A fire pump is required for a warehouse sprinkler system where the city water
supply provides 45 psi static pressure but only 25 psi residual pressure at 1,000 gpm.
Which pump type is most commonly specified for this application?
A. Vertical in-line centrifugal pump
B. Horizontal split-case centrifugal pump
C. Vertical turbine pump in a wet pit
D. Positive displacement pump
B. Horizontal split-case centrifugal pump [CORRECT]
Rationale: Horizontal split-case centrifugal pumps are the most common type for fire
protection due to their efficiency, ease of maintenance, and reliability; vertical in-line (A)
is used for space constraints, vertical turbine (C) is for underground sources, and
positive displacement (D) is rare in sprinkler applications.
Correct Answer: B
Q8. During an inspection, a technician notices water slowly filling the retard chamber
connected to an alarm check valve. What is the primary function of this component?
A. To increase water pressure to the sprinklers
B. To prevent false alarms from water pressure surges while allowing true flow to
activate the alarm
C. To store water for the fire pump
D. To filter debris from the water supply
B. To prevent false alarms from water pressure surges while allowing true flow to
activate the alarm [CORRECT]
| NFPA 13/25 & Minnesota Amendments | Combined Test
Review | Complete Practice Set | Pass Guaranteed - A+
Graded
[Section 1: NFPA 13 - System Types, Components & Installation Requirements
(Q1-28)]
Q1. A wet pipe sprinkler system is being installed in a light hazard office occupancy.
Which statement correctly describes the primary operational characteristic of this
system?
A. Water is held back by a dry pipe valve and air pressure
B. Water is constantly maintained in the piping network up to the sprinklers
C. Water is released only after a detection system activates
D. Air is maintained in the piping at all times to prevent freezing
B. Water is constantly maintained in the piping network up to the sprinklers [CORRECT]
Rationale: A wet pipe system maintains water in the piping at all times, allowing
immediate discharge upon sprinkler activation; A describes a dry pipe system, C
describes a preaction/deluge system, and D describes a dry pipe or antifreeze system.
Correct Answer: B
Q2. A dry pipe valve operates on the differential principle. If the water supply pressure is
100 psi and the valve has a 5:1 differential ratio, what is the maximum air pressure that
can be maintained in the system without tripping the valve?
A. 20 psi
B. 25 psi
C. 100 psi
D. 500 psi
A. 20 psi [CORRECT]
,Rationale: With a 5:1 differential ratio, the maximum air pressure equals water pressure
divided by 5 (100 ÷ 5 = 20 psi); maintaining air pressure below this threshold prevents
nuisance tripping while allowing reliable operation upon sprinkler activation.
Correct Answer: A
Q3. A double interlock preaction system is being installed in a museum with valuable
artifacts. Which sequence correctly describes the activation requirements?
A. Sprinkler operation only
B. Detection system activation only
C. Both detection system activation AND sprinkler operation
D. Either detection system activation OR sprinkler operation
C. Both detection system activation AND sprinkler operation [CORRECT]
Rationale: Double interlock preaction systems require both a detection system alarm
AND individual sprinkler operation before water enters the piping, providing maximum
protection against accidental discharge; single interlock requires only detection, while A
and D describe deluge or wet pipe operation.
Correct Answer: C
Q4. A deluge system is protecting an aircraft hangar with foam-water sprinklers. What is
the primary activation mechanism for this system?
A. Individual heat-responsive sprinkler heads
B. A detection system that opens the deluge valve simultaneously flooding all sprinklers
C. Manual activation at the riser only
D. Air pressure drop in the piping network
B. A detection system that opens the deluge valve simultaneously flooding all sprinklers
[CORRECT]
Rationale: Deluge systems use open sprinklers or nozzles and are activated by a
detection system (electric, pneumatic, or hydraulic) that opens the deluge valve,
,simultaneously discharging water through all devices; A describes wet/dry systems, C is
incomplete, and D describes dry pipe activation.
Correct Answer: B
Q5. An antifreeze system is being installed to protect a small unheated vestibule in
Minnesota. Which antifreeze solution concentration requirement is correct per NFPA
13?
A. Any concentration of propylene glycol is acceptable
B. The solution must be mixed to provide freeze protection at least 10°F below the
lowest expected temperature
C. Only glycerin-based solutions are permitted in new systems
D. The solution concentration does not require testing after initial fill
B. The solution must be mixed to provide freeze protection at least 10°F below the
lowest expected temperature [CORRECT]
Rationale: NFPA 13 requires antifreeze solutions to be mixed to provide freeze
protection at least 10°F below the lowest expected ambient temperature to ensure
reliable operation; A is incorrect due to concentration limits, C is incorrect as propylene
glycol is permitted, and D violates ITM requirements.
Correct Answer: B
Q6. A Class III standpipe system is being installed in a high-rise building in Minneapolis.
Which hose connection and water supply configuration is correct?
A. 1.5-inch hose connections for trained personnel only, supplied by the fire department
pumper truck exclusively
B. 2.5-inch connections for fire department use and 1.5-inch connections with hose
racks for occupant use, supplied by building fire pump
C. 1-inch garden hose connections for building maintenance staff
D. 4-inch connections for standpipe use only with no hose attached
B. 2.5-inch connections for fire department use and 1.5-inch connections with hose
racks for occupant use, supplied by building fire pump [CORRECT]
, Rationale: Class III standpipes combine Class I (2.5-inch for fire department) and Class
II (1.5-inch with hose racks for trained occupants), supplied by a building fire pump or
city water; A describes Class I only, C is not a standpipe classification, and D is not
standard.
Correct Answer: B
Q7. A fire pump is required for a warehouse sprinkler system where the city water
supply provides 45 psi static pressure but only 25 psi residual pressure at 1,000 gpm.
Which pump type is most commonly specified for this application?
A. Vertical in-line centrifugal pump
B. Horizontal split-case centrifugal pump
C. Vertical turbine pump in a wet pit
D. Positive displacement pump
B. Horizontal split-case centrifugal pump [CORRECT]
Rationale: Horizontal split-case centrifugal pumps are the most common type for fire
protection due to their efficiency, ease of maintenance, and reliability; vertical in-line (A)
is used for space constraints, vertical turbine (C) is for underground sources, and
positive displacement (D) is rare in sprinkler applications.
Correct Answer: B
Q8. During an inspection, a technician notices water slowly filling the retard chamber
connected to an alarm check valve. What is the primary function of this component?
A. To increase water pressure to the sprinklers
B. To prevent false alarms from water pressure surges while allowing true flow to
activate the alarm
C. To store water for the fire pump
D. To filter debris from the water supply
B. To prevent false alarms from water pressure surges while allowing true flow to
activate the alarm [CORRECT]
