Maryland (MD) Master Natural Gas Fitter
Practice Exam Questions & Correct
Answers Verified Plus Rationales 2026 |
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1. To qualify for the Maryland Master Natural Gas Fitter examination, an
applicant must hold which current license?
A) A Maryland Master Plumber/Gas Fitter license
B) A Maryland HVACR master or master restricted heating license
C) A Maryland Journeyman Natural Gas Fitter license only
D) A Maryland Propane Gas Fitter certificate
Answer: B
Explanation: Maryland requires applicants for the Master Natural Gas Fitter exam to
hold a current Maryland HVACR master or master restricted heating license in good
standing. They must also have 2 years of experience as a licensed journeyman natural
gas fitter.
2. Where must a master natural gas fitter display their license number?
A) On the license holder's person at all times
B) In the principal place of business and on each vehicle used on the job
C) Only on the company website
D) Only on contracts and bids
Answer: B
Explanation: Maryland law requires each holder of a master natural gas fitters license to
display the license and license number conspicuously in the principal place of business
,and the license number on each vehicle used on the job for providing natural gas
services.
3. Which code primarily governs the installation of residential gas piping systems
in the United States and is a key reference for the Maryland exam?
A) NFPA 54 / ANSI Z223.1
B) NEC
C) OSHA 1910
D) ASME B31.3
Answer: A
Explanation: NFPA 54 / ANSI Z223.1 is the National Fuel Gas Code, which is the
standard that governs the installation of residential and many commercial gas piping
systems.
4. According to Maryland law, when testing an applicant for a master natural gas
fitters license, the exam must include at a minimum which of the following areas?
A) Electrical wiring methods
B) Gas fitting regulations, safety, pipe sizing, mathematics and physics, plan
interpretation, system design, and venting
C) Hydronic heating system design
D) Plumbing fixture installation
Answer: B
Explanation: The seven required exam areas are: gas fitting regulations, safety
regulations, pipe sizing, common principles of mathematics and physics relating to gas
fitting, interpretation of plans and drawings, design and construction of natural gas
systems, and venting gas appliances.
5. Who is authorized to engage in the business of providing natural gas services in
Maryland?
A) Any licensed plumber
B) The holder of a master natural gas fitters license
,C) Any HVACR contractor
D) Any licensed electrician
Answer: B
Explanation: Maryland law (Business Occupations & Professions § 12-401) specifies that
a person may engage in the business of providing natural gas services if they are the
holder of a master natural gas fitters license.
6. What is the minimum clearance required between a gas-fired water heater and a
combustible wall per the IFGC?
A) 1 inch
B) 3 inches
C) 6 inches
D) 12 inches
Answer: B
Explanation: The IFGC specifies at least 3 inches of clearance to prevent heat damage
to combustible materials.
7. Which material is most commonly used for residential natural gas piping due to
its strength and durability?
A) Copper
B) PVC
C) Black steel
D) Cast iron
Answer: C
Explanation: Black steel pipe is favored for its strength, durability, and compatibility
with natural gas.
8. Which material is generally prohibited for underground natural gas piping due
to its potential for corrosion?
A) Polyethylene (PE) pipe
, B) Copper tubing
C) Cast iron pipe
D) Steel pipe with a protective coating
Answer: C
Explanation: Cast iron pipe is generally prohibited for underground gas piping because
it is prone to corrosion and failure over time.
9. Which method is commonly used for joining polyethylene (PE) gas pipes for
underground applications?
A) Threaded connections
B) Compression fittings
C) Butt fusion welding
D) Mechanical couplings only
Answer: C
Explanation: Butt fusion welding creates a strong, seamless joint in PE pipes suitable for
underground gas applications.
10. What is the primary reason for grounding and bonding CSST (Corrugated
Stainless Steel Tubing) piping?
A) To prevent corrosion
B) To ensure electrical continuity and safety against static and lightning
C) To eliminate leaks
D) To comply with aesthetic standards
Answer: B
Explanation: Proper grounding and bonding of CSST prevent static buildup and reduce
the risk of electrical hazards from lightning strikes.
11. Which pipe support spacing is generally recommended for underground
polyethylene piping?
A) 2 feet apart
Practice Exam Questions & Correct
Answers Verified Plus Rationales 2026 |
Instant Download Pdf
1. To qualify for the Maryland Master Natural Gas Fitter examination, an
applicant must hold which current license?
A) A Maryland Master Plumber/Gas Fitter license
B) A Maryland HVACR master or master restricted heating license
C) A Maryland Journeyman Natural Gas Fitter license only
D) A Maryland Propane Gas Fitter certificate
Answer: B
Explanation: Maryland requires applicants for the Master Natural Gas Fitter exam to
hold a current Maryland HVACR master or master restricted heating license in good
standing. They must also have 2 years of experience as a licensed journeyman natural
gas fitter.
2. Where must a master natural gas fitter display their license number?
A) On the license holder's person at all times
B) In the principal place of business and on each vehicle used on the job
C) Only on the company website
D) Only on contracts and bids
Answer: B
Explanation: Maryland law requires each holder of a master natural gas fitters license to
display the license and license number conspicuously in the principal place of business
,and the license number on each vehicle used on the job for providing natural gas
services.
3. Which code primarily governs the installation of residential gas piping systems
in the United States and is a key reference for the Maryland exam?
A) NFPA 54 / ANSI Z223.1
B) NEC
C) OSHA 1910
D) ASME B31.3
Answer: A
Explanation: NFPA 54 / ANSI Z223.1 is the National Fuel Gas Code, which is the
standard that governs the installation of residential and many commercial gas piping
systems.
4. According to Maryland law, when testing an applicant for a master natural gas
fitters license, the exam must include at a minimum which of the following areas?
A) Electrical wiring methods
B) Gas fitting regulations, safety, pipe sizing, mathematics and physics, plan
interpretation, system design, and venting
C) Hydronic heating system design
D) Plumbing fixture installation
Answer: B
Explanation: The seven required exam areas are: gas fitting regulations, safety
regulations, pipe sizing, common principles of mathematics and physics relating to gas
fitting, interpretation of plans and drawings, design and construction of natural gas
systems, and venting gas appliances.
5. Who is authorized to engage in the business of providing natural gas services in
Maryland?
A) Any licensed plumber
B) The holder of a master natural gas fitters license
,C) Any HVACR contractor
D) Any licensed electrician
Answer: B
Explanation: Maryland law (Business Occupations & Professions § 12-401) specifies that
a person may engage in the business of providing natural gas services if they are the
holder of a master natural gas fitters license.
6. What is the minimum clearance required between a gas-fired water heater and a
combustible wall per the IFGC?
A) 1 inch
B) 3 inches
C) 6 inches
D) 12 inches
Answer: B
Explanation: The IFGC specifies at least 3 inches of clearance to prevent heat damage
to combustible materials.
7. Which material is most commonly used for residential natural gas piping due to
its strength and durability?
A) Copper
B) PVC
C) Black steel
D) Cast iron
Answer: C
Explanation: Black steel pipe is favored for its strength, durability, and compatibility
with natural gas.
8. Which material is generally prohibited for underground natural gas piping due
to its potential for corrosion?
A) Polyethylene (PE) pipe
, B) Copper tubing
C) Cast iron pipe
D) Steel pipe with a protective coating
Answer: C
Explanation: Cast iron pipe is generally prohibited for underground gas piping because
it is prone to corrosion and failure over time.
9. Which method is commonly used for joining polyethylene (PE) gas pipes for
underground applications?
A) Threaded connections
B) Compression fittings
C) Butt fusion welding
D) Mechanical couplings only
Answer: C
Explanation: Butt fusion welding creates a strong, seamless joint in PE pipes suitable for
underground gas applications.
10. What is the primary reason for grounding and bonding CSST (Corrugated
Stainless Steel Tubing) piping?
A) To prevent corrosion
B) To ensure electrical continuity and safety against static and lightning
C) To eliminate leaks
D) To comply with aesthetic standards
Answer: B
Explanation: Proper grounding and bonding of CSST prevent static buildup and reduce
the risk of electrical hazards from lightning strikes.
11. Which pipe support spacing is generally recommended for underground
polyethylene piping?
A) 2 feet apart
