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New Mexico (NM) MS-12 Fire Protection Systems
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the New Mexico MS-12
Fire Protection Systems Exam, an open-book contractor licensing test administered by PSI
Services. The exam is delivered via computer at PSI testing centers and assesses practical
trade knowledge and the ability to navigate industry standards for water-based fire
suppression and life-safety systems. Key content areas include NFPA standards for
automatic sprinkler and standpipe systems, hydraulic calculations and water supply, fire
pump installation and maintenance, system types (wet pipe, dry pipe, pre-action, deluge),
inspection, testing, and maintenance (ITM) procedures, and New Mexico Administrative
Codes covering contractor and journeyman licensing, permitting, and plan approvals.
QUESTION 1
According to NFPA 13, what is the minimum distance from a standard spray sprinkler
deflector to the ceiling for unobstructed construction?
A. 1 inch
B. 4 inches
C. 6 inches
D. 12 inches
CORRECT ANSWER: A
EXPERT RATIONALE: NFPA 13 requires deflectors to be positioned 1 in. to 12 in. below
the ceiling for unobstructed construction; 1 inch is the minimum distance allowed.
QUESTION 2
A wet pipe sprinkler system protecting a light hazard occupancy must have a minimum
design area of how many square feet?
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A. 900 ft²
B. 1500 ft²
C. 2000 ft²
D. 3000 ft²
CORRECT ANSWER: B
EXPERT RATIONALE: Per NFPA 13, light hazard occupancies require a minimum design
area of 1500 ft² unless a room design method is used.
QUESTION 3
Which of the following is an acceptable water supply for an automatic sprinkler system
per NFPA 13?
A. A swimming pool
B. A public water main with adequate flow and pressure
C. A decorative water fountain
D. A cooling tower basin
CORRECT ANSWER: B
EXPERT RATIONALE: Acceptable water supplies include public mains, tanks, reservoirs, or
other sources meeting reliability, flow, and pressure requirements; recreational pools are
not listed.
QUESTION 4
What is the maximum ceiling temperature allowed for ordinary-temperature-rated
sprinklers (135°F–170°F classification)?
A. 100°F
B. 150°F
C. 200°F
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D. 225°F
CORRECT ANSWER: B
EXPERT RATIONALE: Ordinary-temperature sprinklers (135°F–170°F) are permitted where
the maximum ceiling temperature does not exceed 150°F.
QUESTION 5
In a light hazard occupancy, the maximum spacing between standard spray sprinklers
on a branch line is:
A. 10 ft
B. 12 ft
C. 15 ft
D. 20 ft
CORRECT ANSWER: C
EXPERT RATIONALE: For light hazard, NFPA 13 allows a maximum spacing of 15 ft for
standard spray sprinklers, providing 225 ft² coverage per sprinkler.
QUESTION 6
Which pipe material is not permitted aboveground for sprinkler systems per NFPA 13?
A. Schedule 40 steel
B. Copper tube (Type L)
C. CPVC (BlazeMaster)
D. Polybutylene (PB)
CORRECT ANSWER: D
EXPERT RATIONALE: Polybutylene pipe is no longer listed for fire protection; NFPA 13
permits steel, copper, and listed CPVC but not PB.
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QUESTION 7
The K-factor of a sprinkler expresses the relationship between flow and:
A. Pipe diameter
B. Temperature rating
C. Pressure
D. Water density
CORRECT ANSWER: C
EXPERT RATIONALE: K-factor relates flow (gpm) to the square root of pressure (psi) in
the formula Q = K√P.
QUESTION 8
When a sprinkler is installed under a soffit or duct wider than 4 ft, which requirement
applies?
A. No sprinkler is needed
B. Additional sprinklers must be installed beneath the obstruction
C. The sprinkler may be moved up to 12 inches
D. Only upright sprinklers are permitted
CORRECT ANSWER: B
EXPERT RATIONALE: Obstructions wider than 4 ft require sprinklers to be installed
beneath them to ensure proper water distribution; this is an NFPA 13 obstruction rule.
QUESTION 9
A dry pipe sprinkler system is primarily used in areas subject to:
A. High humidity
B. Freezing temperatures
C. Corrosive atmospheres
New Mexico (NM) MS-12 Fire Protection Systems
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the New Mexico MS-12
Fire Protection Systems Exam, an open-book contractor licensing test administered by PSI
Services. The exam is delivered via computer at PSI testing centers and assesses practical
trade knowledge and the ability to navigate industry standards for water-based fire
suppression and life-safety systems. Key content areas include NFPA standards for
automatic sprinkler and standpipe systems, hydraulic calculations and water supply, fire
pump installation and maintenance, system types (wet pipe, dry pipe, pre-action, deluge),
inspection, testing, and maintenance (ITM) procedures, and New Mexico Administrative
Codes covering contractor and journeyman licensing, permitting, and plan approvals.
QUESTION 1
According to NFPA 13, what is the minimum distance from a standard spray sprinkler
deflector to the ceiling for unobstructed construction?
A. 1 inch
B. 4 inches
C. 6 inches
D. 12 inches
CORRECT ANSWER: A
EXPERT RATIONALE: NFPA 13 requires deflectors to be positioned 1 in. to 12 in. below
the ceiling for unobstructed construction; 1 inch is the minimum distance allowed.
QUESTION 2
A wet pipe sprinkler system protecting a light hazard occupancy must have a minimum
design area of how many square feet?
,2|Page
A. 900 ft²
B. 1500 ft²
C. 2000 ft²
D. 3000 ft²
CORRECT ANSWER: B
EXPERT RATIONALE: Per NFPA 13, light hazard occupancies require a minimum design
area of 1500 ft² unless a room design method is used.
QUESTION 3
Which of the following is an acceptable water supply for an automatic sprinkler system
per NFPA 13?
A. A swimming pool
B. A public water main with adequate flow and pressure
C. A decorative water fountain
D. A cooling tower basin
CORRECT ANSWER: B
EXPERT RATIONALE: Acceptable water supplies include public mains, tanks, reservoirs, or
other sources meeting reliability, flow, and pressure requirements; recreational pools are
not listed.
QUESTION 4
What is the maximum ceiling temperature allowed for ordinary-temperature-rated
sprinklers (135°F–170°F classification)?
A. 100°F
B. 150°F
C. 200°F
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D. 225°F
CORRECT ANSWER: B
EXPERT RATIONALE: Ordinary-temperature sprinklers (135°F–170°F) are permitted where
the maximum ceiling temperature does not exceed 150°F.
QUESTION 5
In a light hazard occupancy, the maximum spacing between standard spray sprinklers
on a branch line is:
A. 10 ft
B. 12 ft
C. 15 ft
D. 20 ft
CORRECT ANSWER: C
EXPERT RATIONALE: For light hazard, NFPA 13 allows a maximum spacing of 15 ft for
standard spray sprinklers, providing 225 ft² coverage per sprinkler.
QUESTION 6
Which pipe material is not permitted aboveground for sprinkler systems per NFPA 13?
A. Schedule 40 steel
B. Copper tube (Type L)
C. CPVC (BlazeMaster)
D. Polybutylene (PB)
CORRECT ANSWER: D
EXPERT RATIONALE: Polybutylene pipe is no longer listed for fire protection; NFPA 13
permits steel, copper, and listed CPVC but not PB.
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QUESTION 7
The K-factor of a sprinkler expresses the relationship between flow and:
A. Pipe diameter
B. Temperature rating
C. Pressure
D. Water density
CORRECT ANSWER: C
EXPERT RATIONALE: K-factor relates flow (gpm) to the square root of pressure (psi) in
the formula Q = K√P.
QUESTION 8
When a sprinkler is installed under a soffit or duct wider than 4 ft, which requirement
applies?
A. No sprinkler is needed
B. Additional sprinklers must be installed beneath the obstruction
C. The sprinkler may be moved up to 12 inches
D. Only upright sprinklers are permitted
CORRECT ANSWER: B
EXPERT RATIONALE: Obstructions wider than 4 ft require sprinklers to be installed
beneath them to ensure proper water distribution; this is an NFPA 13 obstruction rule.
QUESTION 9
A dry pipe sprinkler system is primarily used in areas subject to:
A. High humidity
B. Freezing temperatures
C. Corrosive atmospheres
