PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
A journeyman plumber and an apprentice, who are employed by a master plumber, are installing the
DWV-system and water distribution system in a 2-½ story single family dwelling. QUESTION: What
answer below shall be considered most correct to complete the following "Plumbing code knowledge"
related statement: A trap that serves a single shower stall that is equipped with a hand shower, a rain
head, and a standard shower head shall be no less than ________ in minimum diameter
A) 1-½" B) 2" C) 2-½" D) 3" - (answer) 2 inches
A journeyman plumber and apprentice are installing 3-inch floor drains in an open-parking-garage that
is subject to freezing temperatures. QUESTION: What answer below shall be considered most correct to
complete the following "Plumbing code knowledge" related statement: The installation of traps at the
floor drain locations which are found susceptible to freezing temperatures may be __________.
A)Increased to 4-inch B) Eliminated C) Wrapped with freeze protection cable D) Insulated - (answer)
eliminated
A journeyman plumber and apprentice are installing lab sinks with faucets that are connected to an acid
waste system for-(special hazardous waste) in a medical lab. What answer below shall be considered
most correct to complete the following "Plumbing code knowledge" related statement: Vacuum breakers
shall be installed with the critical level at least _____-inches above the flood level rim of the fixture they
serve and on the discharge side of the last control valve to the fixture.
A) 12 B) 6 C) 18 D) 3 - (answer) 6 inches
What answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: No plumbing permit shall be issued for cross connection installations that
require ______________ until the application for a permit is accompanied by a letter of approval from
the Massachusetts Department of Environmental Protection or its designee.
A) RPBP B) A "critical level" height C) Atmospheric vacuum breakers D) Water recycling systems -
(answer) reduced pressure backflow preventer (RPBP)
: What answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: The waste discharge from safe waste pans serving water heaters or hot
,PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
water storage tanks where there is _______ below and shall be piped indirectly to a properly trapped
and vented fixture.
A) People B) Occupancy C) Floors D) Plumbing connections - (answer) occupancy
GIVEN: A journeyman plumber and an apprentice, (who are employed by a master plumber), are
installing the sanitary DWV and water distribution system in a five-story residential condominium
complex. QUESTION: What answer below shall be considered most correct to complete the following
"Plumbing code knowledge" related statement: CPVC-(Chlorinated Polyvinyl Chloride) pipe and fittings
may be used provided that none of this material is located within ____-inches of any connection to a hot
water tank as defined in MGL. c. 142, § 17
A) 12 B) 18 C) 20 D) 24 E) 30 - (answer) 24 inches
: A journeyman plumber and apprentice are roughing-in multiple fixtures in a new fitness center. The
facility will include a juice bar, temporary daycare room, men's and women's toilet facilities and men's
and women's locker rooms. QUESTION: What answer below shall be considered most correct to
complete the following "Plumbing code knowledge" related statement: A ________-vent is a branch vent
that serves two or more floor-outlet fixtures that are battery wasted. The vent extends from the top of
the horizontal soil and/or waste branch in front of the last fixture waste and connects to a vent stack or
stack vent that is adjacent to the down-stream end of the horizontal branch.
A) Side B) Loop C) Relief D) Circuit - (answer) loop
MATCH:
Elevated pressure
Flow designation
Ten P.S.I.G. or less
Less than 2-P.S.I
A) 3 P.S.I.G. or ten times
B) Inlet pressure
C) E.H.D.
D) Prof. Engineer - (answer) elevated pressure- d
,PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
flow designation-c
Ten P.S.I.G. or less-a
Less than 2-P.S.I-b
N: A journeyman plumber is installing category-I gas appliances and equipment in the basement of a
building. A 120,000 BTU/hr. boiler and 40,000 BTU/hr. water heater are being installed. QUESTION: What
answer below shall be considered most correct to complete the following "Gas code knowledge" related
statement: The boiler requires a minimum of _____-cu. ft. of air to support proper combustion
A) 2,400 cu. ft. B) 120 sq. in. C) 3,200 sq. ft. D) 800 cu. ft. - (answer) 2,400 cu. ft. 120,000/50
) QUESTION: What answer below shall be considered most correct to complete the following "Gas code
knowledge" related statement: The code would require the gas vent penetrating the roof in-[FIGURE-TP-
B-Q1-1A: GAS VENT SIZING] as identified at point-[A] to be not less than ______ above any portion of a
building within 10-feet horizontally.
A) 24" B) 3-feet C) 30-inches D) Forty-two-inches - (answer) 24
In Massachusetts copper tubing and fittings may be used for natural gas piping
A) Provided that the tubing is type-k with flared fitting connections. B) When approved by the authority
having jurisdiction.
C) At interior locations only and not concealed.
D) If the gas contains no more than .03 grains of hydrogen sulfide per 100 cu. ft. of gas. - (answer) If the
gas contains no more than .03 grains of hydrogen sulfide per 100 cu. ft. of gas
: A journeyman plumber and apprentice, who are employed by a master plumber, are installing a natural
gas fired category-1 boiler and water heater to an interior, clay tile lined, masonry chimney. When
measured in compliance with the code the chimney "height" is 48-feet. QUESTION: What answer below
shall be considered most correct to complete the following "Gas code knowledge" related statement:
_____ is the maximum allowable amount of 6-inch single wall metal vent connector material that may
be installed horizontally to connect the boiler and water heater to the chimney
, PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
A) 36-feet B) 50% of the chimney height C) 48-feet D) 9-feet - (answer) 36 feet
: A journeyman plumber is installing a natural gas fired category-1 boiler with an indirect water heater.
Type-B double wall vent connector material is being used to vent products of combustion from the boiler
to an interior tile lined masonry chimney that is 35-feet in height. QUESTION: What answer below shall
be considered most correct to complete the following "Gas code knowledge" related statement: A
clearance of _____ from combustibles shall be maintained when using/installing type-B vent materials.
A) 6-inches B) 2" C) 1-foot D) One-inch - (answer) one inch
A)1 Fixture unit
B)D 2' X L' X _____= Capacity
C)Diameter ÷ 2
D) .00433A)7.5 GALLONS
A)7.5 GALLONS
B)5.875
C)RADIUS OF A CIRCLE
D)1 CU IN OF WATER - (answer) A)7.5 GALLONS
B)5.875
C)RADIUS OF A CIRCLE
D)1 CU IN OF WATER
) GIVEN: A journeyman plumber and apprentice, who are employed by a master plumber, are installing
sanitary drainage, waste and vents for a beauty salon. The facility is in a rural Town without municipal
sewage connections. A portion of the waste being generated by shampoo sinks in the beauty salon is
being run to a holding tank in compliance with the code. The inside dimensions of the holding tank are
12' X 10'-6" X 8'. QUESTION: What answer below shall be considered most correct to complete the
following "Plumbing and gas-fitting math" related statement: Assume that the holding tank described
above is ⅞-full. ____-gallons of water would be in the tank.
A) 7,558-7,562 B) 6,613-6,617 C) 1,006-1,010 D) 132-136 - (answer) 6,613-6,617 L x W x H X 7.5 =
capacity and wants 87.5 of it
A journeyman plumber and an apprentice, who are employed by a master plumber, are installing the
DWV-system and water distribution system in a 2-½ story single family dwelling. QUESTION: What
answer below shall be considered most correct to complete the following "Plumbing code knowledge"
related statement: A trap that serves a single shower stall that is equipped with a hand shower, a rain
head, and a standard shower head shall be no less than ________ in minimum diameter
A) 1-½" B) 2" C) 2-½" D) 3" - (answer) 2 inches
A journeyman plumber and apprentice are installing 3-inch floor drains in an open-parking-garage that
is subject to freezing temperatures. QUESTION: What answer below shall be considered most correct to
complete the following "Plumbing code knowledge" related statement: The installation of traps at the
floor drain locations which are found susceptible to freezing temperatures may be __________.
A)Increased to 4-inch B) Eliminated C) Wrapped with freeze protection cable D) Insulated - (answer)
eliminated
A journeyman plumber and apprentice are installing lab sinks with faucets that are connected to an acid
waste system for-(special hazardous waste) in a medical lab. What answer below shall be considered
most correct to complete the following "Plumbing code knowledge" related statement: Vacuum breakers
shall be installed with the critical level at least _____-inches above the flood level rim of the fixture they
serve and on the discharge side of the last control valve to the fixture.
A) 12 B) 6 C) 18 D) 3 - (answer) 6 inches
What answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: No plumbing permit shall be issued for cross connection installations that
require ______________ until the application for a permit is accompanied by a letter of approval from
the Massachusetts Department of Environmental Protection or its designee.
A) RPBP B) A "critical level" height C) Atmospheric vacuum breakers D) Water recycling systems -
(answer) reduced pressure backflow preventer (RPBP)
: What answer below shall be considered most correct to complete the following "Plumbing code
knowledge" related statement: The waste discharge from safe waste pans serving water heaters or hot
,PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
water storage tanks where there is _______ below and shall be piped indirectly to a properly trapped
and vented fixture.
A) People B) Occupancy C) Floors D) Plumbing connections - (answer) occupancy
GIVEN: A journeyman plumber and an apprentice, (who are employed by a master plumber), are
installing the sanitary DWV and water distribution system in a five-story residential condominium
complex. QUESTION: What answer below shall be considered most correct to complete the following
"Plumbing code knowledge" related statement: CPVC-(Chlorinated Polyvinyl Chloride) pipe and fittings
may be used provided that none of this material is located within ____-inches of any connection to a hot
water tank as defined in MGL. c. 142, § 17
A) 12 B) 18 C) 20 D) 24 E) 30 - (answer) 24 inches
: A journeyman plumber and apprentice are roughing-in multiple fixtures in a new fitness center. The
facility will include a juice bar, temporary daycare room, men's and women's toilet facilities and men's
and women's locker rooms. QUESTION: What answer below shall be considered most correct to
complete the following "Plumbing code knowledge" related statement: A ________-vent is a branch vent
that serves two or more floor-outlet fixtures that are battery wasted. The vent extends from the top of
the horizontal soil and/or waste branch in front of the last fixture waste and connects to a vent stack or
stack vent that is adjacent to the down-stream end of the horizontal branch.
A) Side B) Loop C) Relief D) Circuit - (answer) loop
MATCH:
Elevated pressure
Flow designation
Ten P.S.I.G. or less
Less than 2-P.S.I
A) 3 P.S.I.G. or ten times
B) Inlet pressure
C) E.H.D.
D) Prof. Engineer - (answer) elevated pressure- d
,PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
flow designation-c
Ten P.S.I.G. or less-a
Less than 2-P.S.I-b
N: A journeyman plumber is installing category-I gas appliances and equipment in the basement of a
building. A 120,000 BTU/hr. boiler and 40,000 BTU/hr. water heater are being installed. QUESTION: What
answer below shall be considered most correct to complete the following "Gas code knowledge" related
statement: The boiler requires a minimum of _____-cu. ft. of air to support proper combustion
A) 2,400 cu. ft. B) 120 sq. in. C) 3,200 sq. ft. D) 800 cu. ft. - (answer) 2,400 cu. ft. 120,000/50
) QUESTION: What answer below shall be considered most correct to complete the following "Gas code
knowledge" related statement: The code would require the gas vent penetrating the roof in-[FIGURE-TP-
B-Q1-1A: GAS VENT SIZING] as identified at point-[A] to be not less than ______ above any portion of a
building within 10-feet horizontally.
A) 24" B) 3-feet C) 30-inches D) Forty-two-inches - (answer) 24
In Massachusetts copper tubing and fittings may be used for natural gas piping
A) Provided that the tubing is type-k with flared fitting connections. B) When approved by the authority
having jurisdiction.
C) At interior locations only and not concealed.
D) If the gas contains no more than .03 grains of hydrogen sulfide per 100 cu. ft. of gas. - (answer) If the
gas contains no more than .03 grains of hydrogen sulfide per 100 cu. ft. of gas
: A journeyman plumber and apprentice, who are employed by a master plumber, are installing a natural
gas fired category-1 boiler and water heater to an interior, clay tile lined, masonry chimney. When
measured in compliance with the code the chimney "height" is 48-feet. QUESTION: What answer below
shall be considered most correct to complete the following "Gas code knowledge" related statement:
_____ is the maximum allowable amount of 6-inch single wall metal vent connector material that may
be installed horizontally to connect the boiler and water heater to the chimney
, PLUMBING LEVEL 3 EXAM 2024-2025 ACTUAL EXAM 60 QUESTIONS AND CORRECT DETAILED ANSWERS
A) 36-feet B) 50% of the chimney height C) 48-feet D) 9-feet - (answer) 36 feet
: A journeyman plumber is installing a natural gas fired category-1 boiler with an indirect water heater.
Type-B double wall vent connector material is being used to vent products of combustion from the boiler
to an interior tile lined masonry chimney that is 35-feet in height. QUESTION: What answer below shall
be considered most correct to complete the following "Gas code knowledge" related statement: A
clearance of _____ from combustibles shall be maintained when using/installing type-B vent materials.
A) 6-inches B) 2" C) 1-foot D) One-inch - (answer) one inch
A)1 Fixture unit
B)D 2' X L' X _____= Capacity
C)Diameter ÷ 2
D) .00433A)7.5 GALLONS
A)7.5 GALLONS
B)5.875
C)RADIUS OF A CIRCLE
D)1 CU IN OF WATER - (answer) A)7.5 GALLONS
B)5.875
C)RADIUS OF A CIRCLE
D)1 CU IN OF WATER
) GIVEN: A journeyman plumber and apprentice, who are employed by a master plumber, are installing
sanitary drainage, waste and vents for a beauty salon. The facility is in a rural Town without municipal
sewage connections. A portion of the waste being generated by shampoo sinks in the beauty salon is
being run to a holding tank in compliance with the code. The inside dimensions of the holding tank are
12' X 10'-6" X 8'. QUESTION: What answer below shall be considered most correct to complete the
following "Plumbing and gas-fitting math" related statement: Assume that the holding tank described
above is ⅞-full. ____-gallons of water would be in the tank.
A) 7,558-7,562 B) 6,613-6,617 C) 1,006-1,010 D) 132-136 - (answer) 6,613-6,617 L x W x H X 7.5 =
capacity and wants 87.5 of it
