Page 1 of 248
Minneapolis Journeyman Plumber with Gas (498-MN-
MI) Contractor Exam ACTUAL EXAM COMPLETE 500
QUESTIONS AND VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
Minneapolis Journeyman Plumber with Gas (498-MN-MI) Contractor Exam. This series is
designed based on the Minnesota Plumbing Code (Chapter 4714), the Minnesota Fuel Gas
Code, and Minneapolis-specific municipal amendments.
Exam Content Overview (All Batches)
The following domains are covered across all question batches to ensure a 360-degree
preparation for the Journeyman licensure:
Coverage
Category Key Technical Areas
%
I. Drainage, Waste & Sizing stacks, horizontal branches, venting methods
30%
Vent (DWV) (wet/circuit), and traps.
Backflow prevention, pressure tanks, sizing water lines,
II. Water Distribution 20%
and water heaters.
Pipe sizing (CSST/Black Iron), venting of appliances,
III. Fuel Gas Piping 20%
combustion air, and pressure testing.
Clearances, ADA requirements, flow rates, and
IV. Fixtures & Trim 15%
installation standards.
Permitting, OSHA trenching standards, testing
V. Admin & Safety 15%
procedures, and inspections.
Batch 1: Questions 1–100
,Page 2 of 248
Question 1: In a two-pipe drainage system, the term "waste stack" refers to the vertical pipe
that carries:
• A) Vent gases only
• B) Only sewage from water closets
• C) Wastewater other than from water closets
• D) Both sewage and stormwater together
• Answer: C
• Rationale: By definition in the MN Plumbing Code, a "waste stack" carries discharge that
does not contain fecal matter (sinks, tubs), whereas a "soil stack" carries discharge
containing fecal matter (toilets/urinals).
Question 2: In a typical residential plumbing system, what is the main purpose of the vent
stack?
• A) To supply hot water to fixtures
• B) To remove wastewater from the building
• C) To prevent water hammer in supply lines
• D) To allow sewer gases to escape and maintain proper drainage flow
,Page 3 of 248
• Answer: D
• Rationale: A vent stack provides air circulation to the drainage system. This prevents
siphoning of trap seals by equalizing atmospheric pressure and allows sewer gases to
vent safely above the roofline.
Question 3: Which of the following plumbing components is specifically designed to protect
potable water from contamination due to backflow?
• A) Air gap
• B) Cleanout
• C) Union fitting
• D) Reducer coupling
• Answer: A
• Rationale: An air gap is the most reliable method of backflow prevention. It is a physical,
vertical, unobstructed space between the water outlet and the flood-level rim of the
receiving vessel.
, Page 4 of 248
Question 4: The component responsible for maintaining a constant water level in a toilet tank is
known as the:
• A) Overflow tube
• B) Flush valve
• C) Ballcock (Fill Valve)
• D) Trip lever
• Answer: C
• Rationale: The ballcock or fill valve is triggered by a float mechanism. When the water
level drops, the valve opens; once the set water level is reached, the float shuts the
valve off.
Question 5: What is the minimum size of a building sewer allowed by the Minnesota Plumbing
Code?
• A) 2 inches
• B) 3 inches
• C) 4 inches
Minneapolis Journeyman Plumber with Gas (498-MN-
MI) Contractor Exam ACTUAL EXAM COMPLETE 500
QUESTIONS AND VERIFIED SOLUTIONS LATEST UPDATE
THIS YEAR
Minneapolis Journeyman Plumber with Gas (498-MN-MI) Contractor Exam. This series is
designed based on the Minnesota Plumbing Code (Chapter 4714), the Minnesota Fuel Gas
Code, and Minneapolis-specific municipal amendments.
Exam Content Overview (All Batches)
The following domains are covered across all question batches to ensure a 360-degree
preparation for the Journeyman licensure:
Coverage
Category Key Technical Areas
%
I. Drainage, Waste & Sizing stacks, horizontal branches, venting methods
30%
Vent (DWV) (wet/circuit), and traps.
Backflow prevention, pressure tanks, sizing water lines,
II. Water Distribution 20%
and water heaters.
Pipe sizing (CSST/Black Iron), venting of appliances,
III. Fuel Gas Piping 20%
combustion air, and pressure testing.
Clearances, ADA requirements, flow rates, and
IV. Fixtures & Trim 15%
installation standards.
Permitting, OSHA trenching standards, testing
V. Admin & Safety 15%
procedures, and inspections.
Batch 1: Questions 1–100
,Page 2 of 248
Question 1: In a two-pipe drainage system, the term "waste stack" refers to the vertical pipe
that carries:
• A) Vent gases only
• B) Only sewage from water closets
• C) Wastewater other than from water closets
• D) Both sewage and stormwater together
• Answer: C
• Rationale: By definition in the MN Plumbing Code, a "waste stack" carries discharge that
does not contain fecal matter (sinks, tubs), whereas a "soil stack" carries discharge
containing fecal matter (toilets/urinals).
Question 2: In a typical residential plumbing system, what is the main purpose of the vent
stack?
• A) To supply hot water to fixtures
• B) To remove wastewater from the building
• C) To prevent water hammer in supply lines
• D) To allow sewer gases to escape and maintain proper drainage flow
,Page 3 of 248
• Answer: D
• Rationale: A vent stack provides air circulation to the drainage system. This prevents
siphoning of trap seals by equalizing atmospheric pressure and allows sewer gases to
vent safely above the roofline.
Question 3: Which of the following plumbing components is specifically designed to protect
potable water from contamination due to backflow?
• A) Air gap
• B) Cleanout
• C) Union fitting
• D) Reducer coupling
• Answer: A
• Rationale: An air gap is the most reliable method of backflow prevention. It is a physical,
vertical, unobstructed space between the water outlet and the flood-level rim of the
receiving vessel.
, Page 4 of 248
Question 4: The component responsible for maintaining a constant water level in a toilet tank is
known as the:
• A) Overflow tube
• B) Flush valve
• C) Ballcock (Fill Valve)
• D) Trip lever
• Answer: C
• Rationale: The ballcock or fill valve is triggered by a float mechanism. When the water
level drops, the valve opens; once the set water level is reached, the float shuts the
valve off.
Question 5: What is the minimum size of a building sewer allowed by the Minnesota Plumbing
Code?
• A) 2 inches
• B) 3 inches
• C) 4 inches
