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G33 Master Gas Pipe Fitter Exam QUESTIONS
AND VERIFIED ANSWERS WITH RATIONALES
JUST RELEASED
G33 Master Gas Pipe Fitter Exam
G33 Master Gas Pipe Fitter Exam. The exam is based on the 2018 IFGC (International Fuel Gas
Code) and covers: General Requirements (installation, materials, plan reading, testing), Appliances and
Equipment, and Venting .
Section 1: General Requirements – Permits, Codes & Materials
1. According to NFPA 54/ANSI Z223.1, what is the primary code that sets safety and installation
standards for residential gas piping systems in the United States?
A) OSHA
B) NFPA 54/ANSI Z223.1
C) ASTM International
D) UL (Underwriters Laboratories)
, Page 2 of 129
Answer: B
Rationale: NFPA 54/ANSI Z223.1 is the primary code that sets safety and installation standards for
residential gas piping systems in the U.S., ensuring proper design, installation, and safety practices .
2. Which of the following work activities requires a permit before gas piping may be installed?
A) Replacing a faucet in a kitchen
B) Installing a new gas meter for a commercial building
C) Painting interior walls of a residential home
D) Installing a low-voltage lighting circuit
Answer: B
Rationale: Installation of a new gas meter is a regulated activity that must be permitted and inspected
to ensure compliance with the gas code and safety standards .
3. The specific gravity of natural gas is approximately:
A) 0.60
B) 1.00
C) 1.50
D) 2.00
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Answer: A
Rationale: Natural gas has a specific gravity of approximately 0.60, meaning it is lighter than air. LP gas
(propane) has a specific gravity of approximately 1.52, making it heavier than air .
4. The main shutoff valve for a residential gas system must be located:
A) Within 6 inches of the meter
B) At the highest point of the system
C) In a readily accessible location, not more than 10 feet from the entrance of the building
D) Inside the kitchen for convenience
Answer: C
Rationale: The main shutoff valve should be easily reachable for emergency isolation and typically must
be located within 10 feet of the building entrance to allow emergency responders to quickly shut off gas
in an emergency .
5. The specific gravity of LP gas (propane) is approximately:
A) 0.60
B) 1.00
C) 1.50
D) 2.00
, Page 4 of 129
Answer: C
Rationale: LP gas (propane) has a specific gravity of approximately 1.50 to 1.52, which is heavier than
air. This affects how the gas disperses in the event of a leak .
6. According to the IFGC, what is the minimum working clearance in front of an electrical panel serving a
gas-fired furnace?
A) 24 inches
B) 30 inches
C) 36 inches
D) 42 inches
Answer: B
Rationale: The NEC (National Electrical Code), which is cross-referenced by the IFGC, requires a 30-inch
clear working space in front of electrical equipment. A Master Fitter must be aware of requirements for
all systems they interact with .
7. Which of the following is NOT an approved material for underground gas piping?
A) Black steel pipe with a protective coating
B) Polyethylene (PE) pipe rated for gas service
C) Copper tubing (Type K)
D) CSST with proper sleeving
G33 Master Gas Pipe Fitter Exam QUESTIONS
AND VERIFIED ANSWERS WITH RATIONALES
JUST RELEASED
G33 Master Gas Pipe Fitter Exam
G33 Master Gas Pipe Fitter Exam. The exam is based on the 2018 IFGC (International Fuel Gas
Code) and covers: General Requirements (installation, materials, plan reading, testing), Appliances and
Equipment, and Venting .
Section 1: General Requirements – Permits, Codes & Materials
1. According to NFPA 54/ANSI Z223.1, what is the primary code that sets safety and installation
standards for residential gas piping systems in the United States?
A) OSHA
B) NFPA 54/ANSI Z223.1
C) ASTM International
D) UL (Underwriters Laboratories)
, Page 2 of 129
Answer: B
Rationale: NFPA 54/ANSI Z223.1 is the primary code that sets safety and installation standards for
residential gas piping systems in the U.S., ensuring proper design, installation, and safety practices .
2. Which of the following work activities requires a permit before gas piping may be installed?
A) Replacing a faucet in a kitchen
B) Installing a new gas meter for a commercial building
C) Painting interior walls of a residential home
D) Installing a low-voltage lighting circuit
Answer: B
Rationale: Installation of a new gas meter is a regulated activity that must be permitted and inspected
to ensure compliance with the gas code and safety standards .
3. The specific gravity of natural gas is approximately:
A) 0.60
B) 1.00
C) 1.50
D) 2.00
, Page 3 of 129
Answer: A
Rationale: Natural gas has a specific gravity of approximately 0.60, meaning it is lighter than air. LP gas
(propane) has a specific gravity of approximately 1.52, making it heavier than air .
4. The main shutoff valve for a residential gas system must be located:
A) Within 6 inches of the meter
B) At the highest point of the system
C) In a readily accessible location, not more than 10 feet from the entrance of the building
D) Inside the kitchen for convenience
Answer: C
Rationale: The main shutoff valve should be easily reachable for emergency isolation and typically must
be located within 10 feet of the building entrance to allow emergency responders to quickly shut off gas
in an emergency .
5. The specific gravity of LP gas (propane) is approximately:
A) 0.60
B) 1.00
C) 1.50
D) 2.00
, Page 4 of 129
Answer: C
Rationale: LP gas (propane) has a specific gravity of approximately 1.50 to 1.52, which is heavier than
air. This affects how the gas disperses in the event of a leak .
6. According to the IFGC, what is the minimum working clearance in front of an electrical panel serving a
gas-fired furnace?
A) 24 inches
B) 30 inches
C) 36 inches
D) 42 inches
Answer: B
Rationale: The NEC (National Electrical Code), which is cross-referenced by the IFGC, requires a 30-inch
clear working space in front of electrical equipment. A Master Fitter must be aware of requirements for
all systems they interact with .
7. Which of the following is NOT an approved material for underground gas piping?
A) Black steel pipe with a protective coating
B) Polyethylene (PE) pipe rated for gas service
C) Copper tubing (Type K)
D) CSST with proper sleeving
