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(MN) Minnesota 496 Journeyman Fuel Gasfitter
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This set of multiple-choice questions is designed for the Minnesota 496 Journeyman Fuel
Gasfitter Exam. The questions are systematically organized to cover all key domains of the
exam outline, including General Knowledge, General Regulations, Components, Sizing and
Design, Installations, and Gas Venting. Each question provides a realistic scenario or
technical point, followed by four answer choices, a clearly identified correct answer, and a
concise expert rationale. The rationale explains the "why" behind the answer, reinforcing
the code concepts, safety principles, and practical trade knowledge necessary for a licensed
journeyman gasfitter to perform safe, compliant work in Minnesota.
QUESTION 1
What is the primary component of natural gas used for fuel in residential applications?
A) Propane
B) Methane
C) Ethane
D) Butane
CORRECT ANSWER: B
EXPERT RATIONALE: Methane is the main hydrocarbon component of natural gas,
comprising approximately 70-90% of its volume and providing its primary fuel value .
QUESTION 2
Which of the following authorities is primarily responsible for issuing fuel gas permits
and conducting final inspections in Minnesota?
A) Minnesota Department of Health
B) Minnesota Pollution Control Agency
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C) The local Authority Having Jurisdiction (AHJ)
D) National Fire Protection Association (NFPA)
CORRECT ANSWER: C
EXPERT RATIONALE: In Minnesota, the AHJ, typically the local building or fire
department, is responsible for issuing permits and performing inspections to ensure
code compliance .
QUESTION 3
The specific gravity of natural gas is approximately 0.6. What is the primary safety
significance of this property?
A) It causes gas to pool in low areas like basements.
B) It causes gas to rise and dissipate, aiding in leak detection.
C) It makes the gas more difficult to ignite.
D) It requires higher pressures for proper appliance operation.
CORRECT ANSWER: B
EXPERT RATIONALE: Because natural gas is lighter than air (specific gravity < 1), it will
rise and dissipate, which is critical for ventilation and leak detection strategies .
QUESTION 4
When must an existing fuel gas system be brought up to current code requirements?
A) Only when a new appliance is added to the system.
B) Whenever any alteration, repair, or maintenance is performed that affects the
system's safety.
C) Only during a complete system replacement.
D) Never; existing systems are grandfathered indefinitely.
CORRECT ANSWER: B
EXPERT RATIONALE: Minnesota code requires that any work affecting the safety of an
existing system must meet current code standards to ensure ongoing safety .
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QUESTION 5
According to the Minnesota Fuel Gas Code, what is the minimum burial depth for
underground metallic gas piping?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
CORRECT ANSWER: B
EXPERT RATIONALE: Most codes, including Minnesota's, require a minimum cover of 18
inches for underground metallic gas piping to protect it from physical damage and
frost .
QUESTION 6
What is the minimum personal protective equipment (PPE) required for a gasfitter
working on live gas lines?
A) Hard hat and steel-toe boots only.
B) Flame-resistant clothing, safety glasses, and gloves.
C) A respirator mask only.
D) Ear plugs and a high-visibility vest only.
CORRECT ANSWER: B
EXPERT RATIONALE: Flame-resistant clothing protects against flash fires, while safety
glasses and gloves protect against debris and chemical exposure during work on live
lines .
QUESTION 7
What is the primary purpose of a sediment trap (drip leg) installed on a gas appliance
connection?
A) To increase gas pressure at the appliance.
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B) To provide a location to collect condensate and debris.
C) To reduce noise from gas flow.
D) To act as a secondary shutoff valve.
CORRECT ANSWER: B
EXPERT RATIONALE: A sediment trap is designed to collect condensate and debris from
the gas stream, preventing them from entering and damaging the appliance's gas
controls .
QUESTION 8
Which of the following materials is NOT approved for use in residential fuel gas piping
in Minnesota?
A) Schedule 40 black steel pipe
B) Copper tubing
C) Corrugated Stainless Steel Tubing (CSST)
D) Polyvinyl chloride (PVC) pipe
CORRECT ANSWER: D
EXPERT RATIONALE: PVC pipe is not approved for fuel gas piping as it cannot safely
withstand gas pressures and temperatures and can become brittle over time .
QUESTION 9
What is the typical nominal pressure for a residential natural gas distribution system?
A) 60 psi
B) 7 inches water column (WC)
C) 2 psi
D) 1/2 psi
CORRECT ANSWER: B
EXPERT RATIONALE: 7 inches water column is the standard delivery pressure for most
(MN) Minnesota 496 Journeyman Fuel Gasfitter
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This set of multiple-choice questions is designed for the Minnesota 496 Journeyman Fuel
Gasfitter Exam. The questions are systematically organized to cover all key domains of the
exam outline, including General Knowledge, General Regulations, Components, Sizing and
Design, Installations, and Gas Venting. Each question provides a realistic scenario or
technical point, followed by four answer choices, a clearly identified correct answer, and a
concise expert rationale. The rationale explains the "why" behind the answer, reinforcing
the code concepts, safety principles, and practical trade knowledge necessary for a licensed
journeyman gasfitter to perform safe, compliant work in Minnesota.
QUESTION 1
What is the primary component of natural gas used for fuel in residential applications?
A) Propane
B) Methane
C) Ethane
D) Butane
CORRECT ANSWER: B
EXPERT RATIONALE: Methane is the main hydrocarbon component of natural gas,
comprising approximately 70-90% of its volume and providing its primary fuel value .
QUESTION 2
Which of the following authorities is primarily responsible for issuing fuel gas permits
and conducting final inspections in Minnesota?
A) Minnesota Department of Health
B) Minnesota Pollution Control Agency
,2|Page
C) The local Authority Having Jurisdiction (AHJ)
D) National Fire Protection Association (NFPA)
CORRECT ANSWER: C
EXPERT RATIONALE: In Minnesota, the AHJ, typically the local building or fire
department, is responsible for issuing permits and performing inspections to ensure
code compliance .
QUESTION 3
The specific gravity of natural gas is approximately 0.6. What is the primary safety
significance of this property?
A) It causes gas to pool in low areas like basements.
B) It causes gas to rise and dissipate, aiding in leak detection.
C) It makes the gas more difficult to ignite.
D) It requires higher pressures for proper appliance operation.
CORRECT ANSWER: B
EXPERT RATIONALE: Because natural gas is lighter than air (specific gravity < 1), it will
rise and dissipate, which is critical for ventilation and leak detection strategies .
QUESTION 4
When must an existing fuel gas system be brought up to current code requirements?
A) Only when a new appliance is added to the system.
B) Whenever any alteration, repair, or maintenance is performed that affects the
system's safety.
C) Only during a complete system replacement.
D) Never; existing systems are grandfathered indefinitely.
CORRECT ANSWER: B
EXPERT RATIONALE: Minnesota code requires that any work affecting the safety of an
existing system must meet current code standards to ensure ongoing safety .
,3|Page
QUESTION 5
According to the Minnesota Fuel Gas Code, what is the minimum burial depth for
underground metallic gas piping?
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
CORRECT ANSWER: B
EXPERT RATIONALE: Most codes, including Minnesota's, require a minimum cover of 18
inches for underground metallic gas piping to protect it from physical damage and
frost .
QUESTION 6
What is the minimum personal protective equipment (PPE) required for a gasfitter
working on live gas lines?
A) Hard hat and steel-toe boots only.
B) Flame-resistant clothing, safety glasses, and gloves.
C) A respirator mask only.
D) Ear plugs and a high-visibility vest only.
CORRECT ANSWER: B
EXPERT RATIONALE: Flame-resistant clothing protects against flash fires, while safety
glasses and gloves protect against debris and chemical exposure during work on live
lines .
QUESTION 7
What is the primary purpose of a sediment trap (drip leg) installed on a gas appliance
connection?
A) To increase gas pressure at the appliance.
, 4|Page
B) To provide a location to collect condensate and debris.
C) To reduce noise from gas flow.
D) To act as a secondary shutoff valve.
CORRECT ANSWER: B
EXPERT RATIONALE: A sediment trap is designed to collect condensate and debris from
the gas stream, preventing them from entering and damaging the appliance's gas
controls .
QUESTION 8
Which of the following materials is NOT approved for use in residential fuel gas piping
in Minnesota?
A) Schedule 40 black steel pipe
B) Copper tubing
C) Corrugated Stainless Steel Tubing (CSST)
D) Polyvinyl chloride (PVC) pipe
CORRECT ANSWER: D
EXPERT RATIONALE: PVC pipe is not approved for fuel gas piping as it cannot safely
withstand gas pressures and temperatures and can become brittle over time .
QUESTION 9
What is the typical nominal pressure for a residential natural gas distribution system?
A) 60 psi
B) 7 inches water column (WC)
C) 2 psi
D) 1/2 psi
CORRECT ANSWER: B
EXPERT RATIONALE: 7 inches water column is the standard delivery pressure for most
