FPA 24 TEST (TFM10)
N
2025-2026 CORRECTLY
ANSWERED QUESTIONS!! |
Private Fire Service Mains Exam
Prep | Pass Guaranteed - A+
Graded
NFPA 24 TEST (TFM10) – CORRECTLY ANSWERED QUESTIONS
#
## 60 Questions – 100% Correct with Complete Rationales (NFPA 24-2022 Edition)
## PART A: MULTIPLE CHOICE (Questions 1–40)
* *Q1 (Scope & General Requirements):** According to NFPA 24-2022, which of the following
systems is NOT covered by the standard?
A. Automatic sprinkler systems supplied by private fire service mains
B. Private fire hydrants and monitor nozzles
C. Dry fire hydrants utilized for drafting operations
D. Water spray fixed systems supplied by private mains
* *[CORRECT]** C
*Rationale: NFPA 24 Section 1.1.3 explicitly states that the standard does not apply to dry fire
hydrants utilized for drafting or mains connected to dry fire hydrants utilized for drafting.
Distractors A, B, and D are all systems explicitly listed in Section 1.1.1 as being covered by
NFPA 24.*
---
* *Q2 (Scope & General Requirements):** NFPA 24-2022 does NOT apply to underground mains
serving sprinkler systems designed per NFPA 13D when the nominal diameter is less than:
A. 2 inches (50 mm)
B. 3 inches (75 mm)
C. 4 inches (100 mm)
,D. 6 inches (150 mm)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 1.1.4 states the standard does not apply to underground mains
serving sprinkler systems designed and installed in accordance with NFPA 13D that are less
than 4 inches (100 mm) in nominal diameter. Distractor A (2 inches) is incorrect; NFPA 13R
systems under 4 inches are also exempt per Section 1.1.5.*
---
* *Q3 (Materials & Installation):** What is the minimum required depth of cover for private fire
service mains installed in vehicular traffic areas per NFPA 24-2022?
A. 12 inches (305 mm)
B. 18 inches (457 mm)
C. 24 inches (610 mm)
D. 30 inches (762 mm)
* *[CORRECT]** D
*Rationale: NFPA 24 Section 10.4.3 requires a minimum depth of cover of 30 inches (762 mm)
or 2.5 feet in areas subject to vehicular traffic to protect against mechanical damage. Distractor
A (12 inches) applies to non-vehicular areas; B and C are not specified minimums in the
standard.*
---
* *Q4 (Materials & Installation):** In non-vehicular grass areas where freezing is not a factor,
what is the minimum depth of cover for private fire service mains?
A. 6 inches (152 mm)
B. 12 inches (305 mm)
C. 18 inches (457 mm)
D. 24 inches (610 mm)
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.3 allows a minimum of 12 inches (305 mm) of cover in
non-vehicular areas where freezing is not a concern. Distractor D (30 inches) applies to
vehicular areas; A is insufficient for mechanical protection; C is not a specified minimum.*
---
* *Q5 (Materials & Installation):** When freezing is a factor, the depth of cover for private fire
service mains shall be at least:
A. 12 inches below the frost line
B. 18 inches below the frost line
C. 24 inches below the frost line
,D. 30 inches below the frost line
* *[CORRECT]** A
*Rationale: NFPA 24 Section 10.4.3 requires that where freezing is a factor, the depth of cover
shall be not less than 12 inches (305 mm) below the frost line for the locality. Distractors B, C,
and D exceed the minimum requirement and may be confused with vehicular area cover
depths.*
---
* *Q6 (Materials & Installation):** Which of the following materials is NOT permitted for
underground private fire service mains per NFPA 24-2022?
A. Ductile iron pipe
B. Steel pipe (coated and wrapped)
C. CPVC pipe
D. Copper tube (Type K)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 10.1.1 lists approved materials including ductile iron, steel, copper,
and polyethylene (PE)/PVC (C900), but CPVC is not listed as an approved material for
underground fire service mains. Many AHJs, including some Texas jurisdictions, specifically
prohibit CPVC for underground fire protection piping.*
---
* *Q7 (Materials & Installation):** Ferrous pipe and fittings installed underground shall be
protected against corrosion by:
A. Painting with latex paint
B. Coating with asphaltic material and wrapping with polyethylene
C. Galvanizing only
D. No protection required if backfill is sand
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.1 requires ferrous pipe and fittings to be protected against
corrosion, typically by coating with a bituminous or other acceptable corrosion-retarding material
and wrapping with polyethylene. Distractor A (latex paint) is not acceptable; C (galvanizing
alone) is insufficient for underground service; D is incorrect as corrosion protection is
mandatory.*
---
* *Q8 (Materials & Installation):** After installation, rods, nuts, bolts, washers, clamps, and other
restraining devices shall be:
A. Painted with zinc chromate primer
, . Cleaned and thoroughly coated with a bituminous or other acceptable corrosion-retarding
B
material
C. Wrapped with electrical tape
D. Left bare for inspection purposes
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.2 requires that after installation, all restraining devices be
cleaned and thoroughly coated with a bituminous or other acceptable corrosion-retarding
material. Distractor A is incomplete; C is unacceptable; D violates the corrosion protection
requirement.*
---
* *Q9 (Materials & Installation):** The minimum bedding depth of clean, granular material
required beneath underground fire service mains is:
A. 2 inches (50 mm)
B. 4 inches (100 mm)
C. 6 inches (150 mm)
D. 12 inches (305 mm)
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.8.1 requires pipe to be laid on a bed of clean, granular material
not less than 4 inches (100 mm) in depth. Distractor C (6 inches) is a common field practice but
exceeds the minimum; A is insufficient; D applies to cover depth, not bedding.*
---
* *Q10 (Fittings & Valves):** Post indicator valves (PIVs) shall be located at least how many feet
from the building they serve?
A. 20 feet (6.1 m)
B. 30 feet (9.1 m)
C. 40 feet (12.2 m)
D. 50 feet (15.2 m)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 6.2.9 requires post indicator valves to be located at least 40 feet
(12.2 m) from the building, unless distance exceptions are met (e.g., fire-rated room, wall post
indicator valve). Distractor A is too close; B is not specified; D exceeds the minimum but is not
required.*
---
* *Q11 (Fittings & Valves):** Which of the following is an acceptable alternative to a post indicator
valve (PIV) for isolating a building's fire protection system?
N
2025-2026 CORRECTLY
ANSWERED QUESTIONS!! |
Private Fire Service Mains Exam
Prep | Pass Guaranteed - A+
Graded
NFPA 24 TEST (TFM10) – CORRECTLY ANSWERED QUESTIONS
#
## 60 Questions – 100% Correct with Complete Rationales (NFPA 24-2022 Edition)
## PART A: MULTIPLE CHOICE (Questions 1–40)
* *Q1 (Scope & General Requirements):** According to NFPA 24-2022, which of the following
systems is NOT covered by the standard?
A. Automatic sprinkler systems supplied by private fire service mains
B. Private fire hydrants and monitor nozzles
C. Dry fire hydrants utilized for drafting operations
D. Water spray fixed systems supplied by private mains
* *[CORRECT]** C
*Rationale: NFPA 24 Section 1.1.3 explicitly states that the standard does not apply to dry fire
hydrants utilized for drafting or mains connected to dry fire hydrants utilized for drafting.
Distractors A, B, and D are all systems explicitly listed in Section 1.1.1 as being covered by
NFPA 24.*
---
* *Q2 (Scope & General Requirements):** NFPA 24-2022 does NOT apply to underground mains
serving sprinkler systems designed per NFPA 13D when the nominal diameter is less than:
A. 2 inches (50 mm)
B. 3 inches (75 mm)
C. 4 inches (100 mm)
,D. 6 inches (150 mm)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 1.1.4 states the standard does not apply to underground mains
serving sprinkler systems designed and installed in accordance with NFPA 13D that are less
than 4 inches (100 mm) in nominal diameter. Distractor A (2 inches) is incorrect; NFPA 13R
systems under 4 inches are also exempt per Section 1.1.5.*
---
* *Q3 (Materials & Installation):** What is the minimum required depth of cover for private fire
service mains installed in vehicular traffic areas per NFPA 24-2022?
A. 12 inches (305 mm)
B. 18 inches (457 mm)
C. 24 inches (610 mm)
D. 30 inches (762 mm)
* *[CORRECT]** D
*Rationale: NFPA 24 Section 10.4.3 requires a minimum depth of cover of 30 inches (762 mm)
or 2.5 feet in areas subject to vehicular traffic to protect against mechanical damage. Distractor
A (12 inches) applies to non-vehicular areas; B and C are not specified minimums in the
standard.*
---
* *Q4 (Materials & Installation):** In non-vehicular grass areas where freezing is not a factor,
what is the minimum depth of cover for private fire service mains?
A. 6 inches (152 mm)
B. 12 inches (305 mm)
C. 18 inches (457 mm)
D. 24 inches (610 mm)
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.3 allows a minimum of 12 inches (305 mm) of cover in
non-vehicular areas where freezing is not a concern. Distractor D (30 inches) applies to
vehicular areas; A is insufficient for mechanical protection; C is not a specified minimum.*
---
* *Q5 (Materials & Installation):** When freezing is a factor, the depth of cover for private fire
service mains shall be at least:
A. 12 inches below the frost line
B. 18 inches below the frost line
C. 24 inches below the frost line
,D. 30 inches below the frost line
* *[CORRECT]** A
*Rationale: NFPA 24 Section 10.4.3 requires that where freezing is a factor, the depth of cover
shall be not less than 12 inches (305 mm) below the frost line for the locality. Distractors B, C,
and D exceed the minimum requirement and may be confused with vehicular area cover
depths.*
---
* *Q6 (Materials & Installation):** Which of the following materials is NOT permitted for
underground private fire service mains per NFPA 24-2022?
A. Ductile iron pipe
B. Steel pipe (coated and wrapped)
C. CPVC pipe
D. Copper tube (Type K)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 10.1.1 lists approved materials including ductile iron, steel, copper,
and polyethylene (PE)/PVC (C900), but CPVC is not listed as an approved material for
underground fire service mains. Many AHJs, including some Texas jurisdictions, specifically
prohibit CPVC for underground fire protection piping.*
---
* *Q7 (Materials & Installation):** Ferrous pipe and fittings installed underground shall be
protected against corrosion by:
A. Painting with latex paint
B. Coating with asphaltic material and wrapping with polyethylene
C. Galvanizing only
D. No protection required if backfill is sand
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.1 requires ferrous pipe and fittings to be protected against
corrosion, typically by coating with a bituminous or other acceptable corrosion-retarding material
and wrapping with polyethylene. Distractor A (latex paint) is not acceptable; C (galvanizing
alone) is insufficient for underground service; D is incorrect as corrosion protection is
mandatory.*
---
* *Q8 (Materials & Installation):** After installation, rods, nuts, bolts, washers, clamps, and other
restraining devices shall be:
A. Painted with zinc chromate primer
, . Cleaned and thoroughly coated with a bituminous or other acceptable corrosion-retarding
B
material
C. Wrapped with electrical tape
D. Left bare for inspection purposes
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.4.2 requires that after installation, all restraining devices be
cleaned and thoroughly coated with a bituminous or other acceptable corrosion-retarding
material. Distractor A is incomplete; C is unacceptable; D violates the corrosion protection
requirement.*
---
* *Q9 (Materials & Installation):** The minimum bedding depth of clean, granular material
required beneath underground fire service mains is:
A. 2 inches (50 mm)
B. 4 inches (100 mm)
C. 6 inches (150 mm)
D. 12 inches (305 mm)
* *[CORRECT]** B
*Rationale: NFPA 24 Section 10.8.1 requires pipe to be laid on a bed of clean, granular material
not less than 4 inches (100 mm) in depth. Distractor C (6 inches) is a common field practice but
exceeds the minimum; A is insufficient; D applies to cover depth, not bedding.*
---
* *Q10 (Fittings & Valves):** Post indicator valves (PIVs) shall be located at least how many feet
from the building they serve?
A. 20 feet (6.1 m)
B. 30 feet (9.1 m)
C. 40 feet (12.2 m)
D. 50 feet (15.2 m)
* *[CORRECT]** C
*Rationale: NFPA 24 Section 6.2.9 requires post indicator valves to be located at least 40 feet
(12.2 m) from the building, unless distance exceptions are met (e.g., fire-rated room, wall post
indicator valve). Distractor A is too close; B is not specified; D exceeds the minimum but is not
required.*
---
* *Q11 (Fittings & Valves):** Which of the following is an acceptable alternative to a post indicator
valve (PIV) for isolating a building's fire protection system?
