MINNESOTA JOURNEYMAN SPRINKLER FITTER EXAMINATION
LATEST EXAM ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS |ALREADY GRADED A+
1. What is the coverage area for Light Hazard heads?: Standard Coverage Area:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) typically specifies a maximum coverage area of
225 square feet per sprinkler head for Light Hazard occupancies. However, this can be reduced to 200 square feet in certain scenarios
2. What is the coverage area for Ordinary Hazard heads?: The coverage area for Ordinary
Hazard sprinkler heads depends on whether you're discussing Ordinary Hazard Group 1 or Ordinary Hazard Group 2
occupancies:
Ordinary Hazard Group 1 (OH-1)
Maximum Coverage Area: 130 square feet per sprinkler head is the typical maximum allowed by NFPA 13. Example
Occupancies: Light manufacturing, warehouses storing non-combustible materials.
Ordinary Hazard Group 2 (OH-2)
Maximum Coverage Area: 100 square feet per sprinkler head is the typical maximum allowed by NFPA 13. Example
Occupancies: Warehouses with high piled combustibles, parking garages, car dealerships.
3. What is the coverage area for Extra Hazard heads?: Typical Coverage Areas:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) often specifies a maximum coverage area of
90-130 square feet per sprinkler head for Extra Hazard occupancies.
Specific Variations: The exact coverage area depends on factors like the type of hazard, storage arrangement, and the specific sprinkler
listing.
4. What is the coverage area for ESFR heads?: 100 sq ft
5. What is the coverage area for Storage heads?: 100 sq ft or 130 sq ft
6. Minimum air pressure for a pressure tank: 75 psi
7. What pipe sizes can feed 1½" hose lines and for what length: must be connected to mains at least 2½" in
diameter
1" for horizontal runs up to 20' 1¼"
for 20' to 80'
1½" for runs over 80'
8. What are the bulb colors for each temperature rating: ordinary - orange or red intermediate -
yellow or green
1|Page
, high - blue
extra high - purple very
extra high - black ultra
high - black
9. How often is the interior of a pressure tank inspected: 5 years for all, 3 years for tanks without corrosion
protection
10. How often do you flow standpipes: 5 years
11. How many heads can be taken off a cold weather valve: 10
12. Hanger spacing from end of pipe: 1" - 3' 1¼" - 4'
1½" and up - 5'
13. Duration of water supply for NFPA 13D systems: system demand times 10 minutes
14. Why is a check valve with a 3/32" hole in Clapper required to be installed in the system riser
below the test valve in freezer spaces: prevent evaporation of priming water into system
15. Maximum time allowed for water flow alarms to sound: 5 minutes
16. what pressure and flow are 1½" hose stations designed for: 50 gpm at system pressure
17. class III and class I standpipe systems are designed for what pressures and flows: 250 gpm @ 100
psi
18. class II standpipe systems are designed for what pressures and flows: 100 gpm
@ 65 psi
19. Acceptance tests required for dry pipe systems: hydro test, air test, alarm test
20. flow of a master stream is?: at least 250 gpm
21. bypass around check valve on tank shall be required to fill the tank in how many hours? what
is the minimum size of this bypass?: 8 hours, 2" diameter
22. minimum amount of time to close a valve?: 5 seconds
23. why is the eccentric reducer on the suction side of the pump?: to prevent air pockets
24. what color frame arms are on extra high temp sprinkler heads?: red
25. what percent of portable fire extinguishers can be removed if 1½" hose lines are capable of
reaching all parts of the building?: up to 50%
26. what did NFPA 231C govern?: rack storage
27. what type of pipe is not allowed for use in NFPA 13D?: aluminum or other pipe not listed
28. extra heavy pattern fittings shall be used when?: when pressures exceed 175 psi
29. what is the contractors certificate used for?: system acceptance
30. when are return bends used?: systems connected to non-potable water supplies
2|Page
, 31. powder driven studs must have what attached to them?: increaser couplings
32. what size head orifice must be used when installing sprinklers in a kitchen hood and a vent
duct?: k-factors of 1.4 to 5.6
33. what temperature heads should be used for light, ordinary, and extra haz- ard?: ordinary
34. sidewall sprinklers shall not be used under what type of ceiling?: sloped ceilings
or ceilings that aren't flat
35. are FDCs required for NFPA 13R systems?: all but single story buildings that are less than 2000 sq ft
36. pump rooms shall be lighted and heated?: yes
37. in scheduled systems, what are the maximum numbers of sprinkler heads that can be taken
off sizes 1" through 3": 1" - 2
1¼" - 3
1½" - 5
2" - 10
light hazard ordinary hazard 2½" -
30 2½" - 20
3" - 60 3" - 40
38. maximum time allowed for water to reach inspectors test on dry pipe sys- tem?: 60 seconds
39. hanger spacing for steel pipe 1" &
1¼"
1½" to 8": 1" & 1¼" = 12'
1½" to 8" = 15'
40. hanger spacing for threadable lightwall steel pipe 1" to 3": 12'
41. hanger spacing for copper tube pipe
¾" to 1" 1¼"
to 1½" 2" to
3"
3.5" to 8": 8'
10'
12'
15'
42. hanger spacing for CPVC pipe
¾"
1"
3|Page
, 1¼"
1½"
2"
2½"
3": 5' 6"
6'
6' 6"
7'
8'
9'
10'
43. distance between support of risers shall not exceed?: 25 feet
44. hanger required within what distance on horizontal main after riser?: 2 feet
45. where does the FDC go on a single zone dry system?: between dry pipe valve and control valve
46. what temperature sprinkler head if above a heat duct?: high temperature head if inside 7' radius
47. seismic bracing and pipe hangers inspected from floor level how often?: an- nually
48. maximum distance between 1½" hose stations?: 150 feet
49. what is the Minnesota state fire protection code?: 299M
50. what is the fine for working in Minnesota without a Minnesota journeyman's license?:
$1000/day
51. what is the maximum square footage of a light hazard zone?: 52,000 sq ft
52. what is the maximum square footage of a ordinary hazard zone?: 52,000 sq ft
53. what is the maximum square footage of a extra hazard zone?: 40,000 sq ft for hydraulically calculated
systems and 20,000 sq ft for scheduled systems
4|Page
LATEST EXAM ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS |ALREADY GRADED A+
1. What is the coverage area for Light Hazard heads?: Standard Coverage Area:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) typically specifies a maximum coverage area of
225 square feet per sprinkler head for Light Hazard occupancies. However, this can be reduced to 200 square feet in certain scenarios
2. What is the coverage area for Ordinary Hazard heads?: The coverage area for Ordinary
Hazard sprinkler heads depends on whether you're discussing Ordinary Hazard Group 1 or Ordinary Hazard Group 2
occupancies:
Ordinary Hazard Group 1 (OH-1)
Maximum Coverage Area: 130 square feet per sprinkler head is the typical maximum allowed by NFPA 13. Example
Occupancies: Light manufacturing, warehouses storing non-combustible materials.
Ordinary Hazard Group 2 (OH-2)
Maximum Coverage Area: 100 square feet per sprinkler head is the typical maximum allowed by NFPA 13. Example
Occupancies: Warehouses with high piled combustibles, parking garages, car dealerships.
3. What is the coverage area for Extra Hazard heads?: Typical Coverage Areas:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) often specifies a maximum coverage area of
90-130 square feet per sprinkler head for Extra Hazard occupancies.
Specific Variations: The exact coverage area depends on factors like the type of hazard, storage arrangement, and the specific sprinkler
listing.
4. What is the coverage area for ESFR heads?: 100 sq ft
5. What is the coverage area for Storage heads?: 100 sq ft or 130 sq ft
6. Minimum air pressure for a pressure tank: 75 psi
7. What pipe sizes can feed 1½" hose lines and for what length: must be connected to mains at least 2½" in
diameter
1" for horizontal runs up to 20' 1¼"
for 20' to 80'
1½" for runs over 80'
8. What are the bulb colors for each temperature rating: ordinary - orange or red intermediate -
yellow or green
1|Page
, high - blue
extra high - purple very
extra high - black ultra
high - black
9. How often is the interior of a pressure tank inspected: 5 years for all, 3 years for tanks without corrosion
protection
10. How often do you flow standpipes: 5 years
11. How many heads can be taken off a cold weather valve: 10
12. Hanger spacing from end of pipe: 1" - 3' 1¼" - 4'
1½" and up - 5'
13. Duration of water supply for NFPA 13D systems: system demand times 10 minutes
14. Why is a check valve with a 3/32" hole in Clapper required to be installed in the system riser
below the test valve in freezer spaces: prevent evaporation of priming water into system
15. Maximum time allowed for water flow alarms to sound: 5 minutes
16. what pressure and flow are 1½" hose stations designed for: 50 gpm at system pressure
17. class III and class I standpipe systems are designed for what pressures and flows: 250 gpm @ 100
psi
18. class II standpipe systems are designed for what pressures and flows: 100 gpm
@ 65 psi
19. Acceptance tests required for dry pipe systems: hydro test, air test, alarm test
20. flow of a master stream is?: at least 250 gpm
21. bypass around check valve on tank shall be required to fill the tank in how many hours? what
is the minimum size of this bypass?: 8 hours, 2" diameter
22. minimum amount of time to close a valve?: 5 seconds
23. why is the eccentric reducer on the suction side of the pump?: to prevent air pockets
24. what color frame arms are on extra high temp sprinkler heads?: red
25. what percent of portable fire extinguishers can be removed if 1½" hose lines are capable of
reaching all parts of the building?: up to 50%
26. what did NFPA 231C govern?: rack storage
27. what type of pipe is not allowed for use in NFPA 13D?: aluminum or other pipe not listed
28. extra heavy pattern fittings shall be used when?: when pressures exceed 175 psi
29. what is the contractors certificate used for?: system acceptance
30. when are return bends used?: systems connected to non-potable water supplies
2|Page
, 31. powder driven studs must have what attached to them?: increaser couplings
32. what size head orifice must be used when installing sprinklers in a kitchen hood and a vent
duct?: k-factors of 1.4 to 5.6
33. what temperature heads should be used for light, ordinary, and extra haz- ard?: ordinary
34. sidewall sprinklers shall not be used under what type of ceiling?: sloped ceilings
or ceilings that aren't flat
35. are FDCs required for NFPA 13R systems?: all but single story buildings that are less than 2000 sq ft
36. pump rooms shall be lighted and heated?: yes
37. in scheduled systems, what are the maximum numbers of sprinkler heads that can be taken
off sizes 1" through 3": 1" - 2
1¼" - 3
1½" - 5
2" - 10
light hazard ordinary hazard 2½" -
30 2½" - 20
3" - 60 3" - 40
38. maximum time allowed for water to reach inspectors test on dry pipe sys- tem?: 60 seconds
39. hanger spacing for steel pipe 1" &
1¼"
1½" to 8": 1" & 1¼" = 12'
1½" to 8" = 15'
40. hanger spacing for threadable lightwall steel pipe 1" to 3": 12'
41. hanger spacing for copper tube pipe
¾" to 1" 1¼"
to 1½" 2" to
3"
3.5" to 8": 8'
10'
12'
15'
42. hanger spacing for CPVC pipe
¾"
1"
3|Page
, 1¼"
1½"
2"
2½"
3": 5' 6"
6'
6' 6"
7'
8'
9'
10'
43. distance between support of risers shall not exceed?: 25 feet
44. hanger required within what distance on horizontal main after riser?: 2 feet
45. where does the FDC go on a single zone dry system?: between dry pipe valve and control valve
46. what temperature sprinkler head if above a heat duct?: high temperature head if inside 7' radius
47. seismic bracing and pipe hangers inspected from floor level how often?: an- nually
48. maximum distance between 1½" hose stations?: 150 feet
49. what is the Minnesota state fire protection code?: 299M
50. what is the fine for working in Minnesota without a Minnesota journeyman's license?:
$1000/day
51. what is the maximum square footage of a light hazard zone?: 52,000 sq ft
52. what is the maximum square footage of a ordinary hazard zone?: 52,000 sq ft
53. what is the maximum square footage of a extra hazard zone?: 40,000 sq ft for hydraulically calculated
systems and 20,000 sq ft for scheduled systems
4|Page
