PLUMBING LEVEL 3 EXAM 2024-2025 COMPLETE
130 ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS |ALREADY GRADED A+
1. petroleum gas piping system installed within the same building or structure is
identified with ________.
A) 3-inch wide bands
B) 4" Equilateral triangles
C) ½-high lettering
D) Green and yellow labels - Correct Answer - Green and yellow labels
2. A journeyman and apprentice plumber/gasfitter are completing the installation of
natural gas fired equipment that is connected to a low-pressure gas service supply main
and gas booster. The gas service supply will provide gas at-[7" water column]. The gas
equipment being installed requires a constant uniform pressure of-[9'' water column].
QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: If not part of the booster, the
equipment served by the booster shall be equipped with a manual reset ________ gas
pressure switch and a check valve upstream of the booster
A) High
B) Interlocking
C) Safety shut-off
D) Low - Correct Answer - Low
3. A journeyman and apprentice plumber/gasfitter are completing the installation of
CSST. The tubing shall be sleeved when passing through a metal or concrete deck to
protect the integrity of the material. QUESTION: What answer below shall be
considered most correct to complete the following "Gas code knowledge" related
pg. 1
,statement: The sleeve used shall be Schedule 40 black or galvanized steel pipe and
shall extend a minimum of _____- inches from the top of the finished floor and the
underside of the deck.
A) Two
B) 6
C) Twelve
D) 18 - Correct Answer - 6
4. A journeyman and apprentice plumber/gasfitter are commencing with the installation
of natural gas fired equipment outfitted with a burner and a combustion chamber that
requires an input of 750,000 BTU/hr. for heating. QUESTION: What answer below shall
be considered most correct to complete the following "Gas code knowledge" related
statement: All installations of fuel gas utilization equipment not governed by NFPA 85 or
86 (as amended) having inputs over _____________ per combustion chamber shall be
governed by 248 CMR 7.00: Large Gas Utilization Equipment.
A) 5,000,000 BTU/hr.
B) 400,000 BTU/hr.
C) 12,500,000 BTU/hr.
D) 1,000,000 BTU/hr - Correct Answer - 400,000 BTU/hr.
5. A journeyman plumber/gasfitter is installing an HE-(high efficiency) natural gas fired
boiler that is located in the basement of a building. Listed schedule 40 PVC and other
listed non-metallic piping that will be used for the purpose of ventilation, make-up, or
combustion air intakes shall be labeled. QUESTION: What answer below shall be
considered most correct to complete the following "Gas code knowledge" related
statement: Labels must be placed every _______ for exhaust and intake piping that is to
be concealed.
A) 2-feet
B) 3-feet
C) 10-feet
pg. 2
,D) 25-feet - Correct Answer - 3-feet
6. A journeyman plumber is completing the installation of gas fired furnaces, water
heaters, cooktops and dryers in a (20)-unit residential condominium development.
QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: Gas shut-off valves installed within
the gas piping or tubing gas supply system shall be no more than _______ away when
used to turn-off or service gas appliances and equipment.
A) 12-inches
B) 2-feet
C) 36-inches
D) 6-feet - Correct Answer - 6-feet
7. Seven-times the cross-sectional area of a 3"-diameter vent connector is _______sq.
in.
A) Nine
B) 7.07
C) 27.0
D) 49.5 - Correct Answer - 49.5
d2 x .7854=7.07
7.07 x 7 = 49.5
8. A journeyman plumber is completing the installation of a mop receptor in a
commercial building. The faucet being used for the mop receptor is designed to deliver
water at the rate of-[one cubic foot of water per minute] through a spout that is outfitted
with a hose connection. QUESTION: What answer below shall be considered most
correct to complete the following "Plumbing math knowledge" related statement: A hose
connected to the mop receptor faucet running for one-hour will potential discharge
_____-gallons of water.
pg. 3
, A) 450
B) 500
C) 750
D) 62.5 - Correct Answer - 450
60 min x 7.5
9. The horizontal storm conductor pipes installed within the building presented at-
[FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ⅛-slope.
The storm drainage system is serving the roof of a multiple unit commercial
condominium building. QUESTION: What answer below shall be considered most
correct to complete the following "Storm drain sizing" related statement: The code would
require the storm conductor identified at point-[D] to be a minimum size of _____-inch.
A) 4
B) 8
C) 6
D) 5 - Correct Answer - 6
10. [FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ¼-
slope. The storm drainage system is serving the roof of a multiple unit commercial
condominium building. QUESTION: What answer below shall be considered most
correct to complete the following "Storm drain sizing" related statement: The code would
require the roof-drain identified at point-[F] to be a minimum size of ____-inch.
A) 3
B) 4
C) 2-½
D) 2 - Correct Answer - 3
11. The horizontal storm conductor pipes installed within the building presented at-
[FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ½-slope.
The storm drainage system is serving the roof of a multiple unit commercial
pg. 4
130 ACTUAL EXAM QUESTIONS AND CORRECT
DETAILED ANSWERS |ALREADY GRADED A+
1. petroleum gas piping system installed within the same building or structure is
identified with ________.
A) 3-inch wide bands
B) 4" Equilateral triangles
C) ½-high lettering
D) Green and yellow labels - Correct Answer - Green and yellow labels
2. A journeyman and apprentice plumber/gasfitter are completing the installation of
natural gas fired equipment that is connected to a low-pressure gas service supply main
and gas booster. The gas service supply will provide gas at-[7" water column]. The gas
equipment being installed requires a constant uniform pressure of-[9'' water column].
QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: If not part of the booster, the
equipment served by the booster shall be equipped with a manual reset ________ gas
pressure switch and a check valve upstream of the booster
A) High
B) Interlocking
C) Safety shut-off
D) Low - Correct Answer - Low
3. A journeyman and apprentice plumber/gasfitter are completing the installation of
CSST. The tubing shall be sleeved when passing through a metal or concrete deck to
protect the integrity of the material. QUESTION: What answer below shall be
considered most correct to complete the following "Gas code knowledge" related
pg. 1
,statement: The sleeve used shall be Schedule 40 black or galvanized steel pipe and
shall extend a minimum of _____- inches from the top of the finished floor and the
underside of the deck.
A) Two
B) 6
C) Twelve
D) 18 - Correct Answer - 6
4. A journeyman and apprentice plumber/gasfitter are commencing with the installation
of natural gas fired equipment outfitted with a burner and a combustion chamber that
requires an input of 750,000 BTU/hr. for heating. QUESTION: What answer below shall
be considered most correct to complete the following "Gas code knowledge" related
statement: All installations of fuel gas utilization equipment not governed by NFPA 85 or
86 (as amended) having inputs over _____________ per combustion chamber shall be
governed by 248 CMR 7.00: Large Gas Utilization Equipment.
A) 5,000,000 BTU/hr.
B) 400,000 BTU/hr.
C) 12,500,000 BTU/hr.
D) 1,000,000 BTU/hr - Correct Answer - 400,000 BTU/hr.
5. A journeyman plumber/gasfitter is installing an HE-(high efficiency) natural gas fired
boiler that is located in the basement of a building. Listed schedule 40 PVC and other
listed non-metallic piping that will be used for the purpose of ventilation, make-up, or
combustion air intakes shall be labeled. QUESTION: What answer below shall be
considered most correct to complete the following "Gas code knowledge" related
statement: Labels must be placed every _______ for exhaust and intake piping that is to
be concealed.
A) 2-feet
B) 3-feet
C) 10-feet
pg. 2
,D) 25-feet - Correct Answer - 3-feet
6. A journeyman plumber is completing the installation of gas fired furnaces, water
heaters, cooktops and dryers in a (20)-unit residential condominium development.
QUESTION: What answer below shall be considered most correct to complete the
following "Gas code knowledge" related statement: Gas shut-off valves installed within
the gas piping or tubing gas supply system shall be no more than _______ away when
used to turn-off or service gas appliances and equipment.
A) 12-inches
B) 2-feet
C) 36-inches
D) 6-feet - Correct Answer - 6-feet
7. Seven-times the cross-sectional area of a 3"-diameter vent connector is _______sq.
in.
A) Nine
B) 7.07
C) 27.0
D) 49.5 - Correct Answer - 49.5
d2 x .7854=7.07
7.07 x 7 = 49.5
8. A journeyman plumber is completing the installation of a mop receptor in a
commercial building. The faucet being used for the mop receptor is designed to deliver
water at the rate of-[one cubic foot of water per minute] through a spout that is outfitted
with a hose connection. QUESTION: What answer below shall be considered most
correct to complete the following "Plumbing math knowledge" related statement: A hose
connected to the mop receptor faucet running for one-hour will potential discharge
_____-gallons of water.
pg. 3
, A) 450
B) 500
C) 750
D) 62.5 - Correct Answer - 450
60 min x 7.5
9. The horizontal storm conductor pipes installed within the building presented at-
[FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ⅛-slope.
The storm drainage system is serving the roof of a multiple unit commercial
condominium building. QUESTION: What answer below shall be considered most
correct to complete the following "Storm drain sizing" related statement: The code would
require the storm conductor identified at point-[D] to be a minimum size of _____-inch.
A) 4
B) 8
C) 6
D) 5 - Correct Answer - 6
10. [FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ¼-
slope. The storm drainage system is serving the roof of a multiple unit commercial
condominium building. QUESTION: What answer below shall be considered most
correct to complete the following "Storm drain sizing" related statement: The code would
require the roof-drain identified at point-[F] to be a minimum size of ____-inch.
A) 3
B) 4
C) 2-½
D) 2 - Correct Answer - 3
11. The horizontal storm conductor pipes installed within the building presented at-
[FIGURE-TP-B-Q1-4A: STORM DRAIN SIZING KNOWLEDGE] are placed at ½-slope.
The storm drainage system is serving the roof of a multiple unit commercial
pg. 4
