Massachusetts (MA) Master Gas Fitter Practice Exam
Question 1: Which chapter of the Massachusetts General Laws governs plumbing and gas
fitting in the state?
A. Chapter 140
B. Chapter 141
C. Chapter 142
D. Chapter 143
Explanation: Chapter 142 of the Massachusetts General Laws specifically covers plumbing and
gas fitting regulations.
Question 2: Under which sections of the 248 CMR do the administrative regulations for gas
fitting fall?
A. Sections 1 through 4
B. Sections 3 through 11
C. Sections 5 through 13
D. Sections 2 through 10
Explanation: The administrative regulations for gas fitting are detailed in Sections 3 through 11
of 248 CMR.
Question 3: What is the primary purpose of the safety protocols in gas fitting operations?
A. To reduce installation time
B. To ensure aesthetic appeal
C. To prevent accidents during installation
D. To minimize material costs
Explanation: Safety protocols are implemented to prevent accidents during gas fitting operations.
Question 4: When installing underground gas piping, which factor is most critical?
A. The color of the pipe
B. Pipe depth and protection
C. Pipe manufacturer’s logo
D. The installation speed
Explanation: Correct pipe depth and protection are crucial for preventing damage and ensuring
safety in underground installations.
Question 5: What is one of the key components tested during a gas system inspection?
A. The aesthetic finish of the pipe joints
B. The integrity of joints and connections
C. The brand of the tools used
D. The noise level of the installation
Explanation: Inspectors test the integrity of joints and connections to ensure there are no leaks or
faults.
,Question 6: Which of the following best describes the role of MGL 142?
A. It provides building design guidelines
B. It establishes plumbing and gas fitting regulations
C. It governs electrical wiring standards
D. It outlines fire safety procedures
Explanation: MGL 142 establishes the legal framework for plumbing and gas fitting in
Massachusetts.
Question 7: What does 248 CMR primarily address in relation to gas fitting?
A. Financial management
B. Administrative rules and modifications
C. Landscaping regulations
D. Energy consumption
Explanation: 248 CMR contains administrative rules and specific sections on modifications and
equipment standards in gas fitting.
Question 8: Which aspect of gas fitting is directly concerned with excavation procedures?
A. Aesthetic design
B. Safety and excavation
C. Marketing strategy
D. Customer service
Explanation: Safety and excavation procedures ensure that gas piping installation does not
damage existing utilities and prevents accidents.
Question 9: When testing gas equipment, what is the primary objective?
A. To check the color coding of wires
B. To ensure safe and proper operation
C. To evaluate the design style
D. To measure installation speed
Explanation: Testing gas equipment verifies that it operates safely and meets performance
standards.
Question 10: In the context of gas piping design, why is material selection important?
A. It affects the visual appeal only
B. It determines the longevity and safety of the installation
C. It reduces the installation team size
D. It improves marketing potential
Explanation: Selecting the proper materials is essential to ensure long-term durability and safety
of gas piping systems.
Question 11: What does CSST stand for in gas piping installations?
A. Composite Steel Support Tubing
B. Corrugated Stainless Steel Tubing
C. Constructed Silicone Sealant Tubing
D. Controlled Safety Steel Tether
,Explanation: CSST stands for Corrugated Stainless Steel Tubing, used in gas piping systems for
flexibility and durability.
Question 12: Which of the following is a key consideration when installing CSST?
A. Matching the building’s paint scheme
B. Adhering to safety guidelines to prevent damage
C. Increasing the pipe diameter unnecessarily
D. Using it for water piping
Explanation: CSST installation must strictly follow safety guidelines to prevent damage from
accidental contact with metal surfaces.
Question 13: What is the function of a gas piping regulator?
A. To change the pipe’s color
B. To control gas pressure
C. To determine the installation cost
D. To increase gas volume
Explanation: A gas regulator controls the pressure of the gas delivered to appliances ensuring
safe operation.
Question 14: Why is proper combustion air important in gas appliance installations?
A. It improves the visual design
B. It ensures efficient combustion and appliance performance
C. It increases the installation time
D. It minimizes regulatory oversight
Explanation: Adequate combustion air is necessary for efficient burning of gas and optimal
appliance performance.
Question 15: Which step is essential in the purging process of a gas system?
A. Painting the pipes
B. Removing air to prevent explosive mixtures
C. Increasing gas flow speed
D. Doubling the number of pipes
Explanation: Purging involves removing air from the system to avoid creating explosive gas
mixtures during operation.
Question 16: In gas piping, what is the significance of inspecting joints and connections?
A. They determine the installation’s visual appeal
B. They are potential leak points and must be secure
C. They are used only for temporary support
D. They reduce the overall installation cost
Explanation: Secure joints and connections are vital for preventing leaks and ensuring safety.
Question 17: What does the term “modifications” refer to in Sections 4 and 5 of 248 CMR?
A. Changing the color scheme of appliances
B. Alterations to existing gas systems
C. Upgrading electrical wiring
, D. Installing new water fixtures
Explanation: Sections 4 and 5 address modifications, which involve making changes to existing
gas systems while following regulatory guidelines.
Question 18: For gas equipment exceeding 400,000 BTUs, which regulation applies?
A. Section 3 – 248 CMR
B. Section 7 – 248 CMR
C. Section 10 – 248 CMR
D. Section 11 – 248 CMR
Explanation: Section 7 of 248 CMR contains the specific requirements for installing and
operating gas equipment over 400,000 BTUs.
Question 19: Which characteristic distinguishes natural draft venting systems?
A. They require mechanical fans
B. They rely on buoyancy of hot gases
C. They are used exclusively for heating water
D. They require electrical power to operate
Explanation: Natural draft venting systems work by the buoyancy of hot gases, eliminating the
need for mechanical assistance.
Question 20: What is a primary concern when sizing a venting system?
A. Its weight
B. Ensuring proper draft and exhaust flow
C. The number of colors available
D. The installation cost only
Explanation: Correct sizing of a venting system ensures adequate draft and proper exhaust of
combustion gases for safe operation.
Question 21: Which type of venting system is often used with appliances that have forced
air induction?
A. Non-positive venting
B. Positive venting
C. Negative venting
D. Ambient venting
Explanation: Positive venting systems are typically used with appliances that incorporate forced
air induction to expel combustion gases.
Question 22: What does “non-positive venting” imply in gas appliance installations?
A. Venting that relies solely on natural draft
B. Venting enhanced by additional fans
C. Venting that uses mechanical draft only
D. Venting that is not required by code
Explanation: Non-positive venting relies on natural draft without mechanical assistance.
Question 23: Which material is commonly approved for gas venting systems?
A. Galvanized steel with improper sealing
Question 1: Which chapter of the Massachusetts General Laws governs plumbing and gas
fitting in the state?
A. Chapter 140
B. Chapter 141
C. Chapter 142
D. Chapter 143
Explanation: Chapter 142 of the Massachusetts General Laws specifically covers plumbing and
gas fitting regulations.
Question 2: Under which sections of the 248 CMR do the administrative regulations for gas
fitting fall?
A. Sections 1 through 4
B. Sections 3 through 11
C. Sections 5 through 13
D. Sections 2 through 10
Explanation: The administrative regulations for gas fitting are detailed in Sections 3 through 11
of 248 CMR.
Question 3: What is the primary purpose of the safety protocols in gas fitting operations?
A. To reduce installation time
B. To ensure aesthetic appeal
C. To prevent accidents during installation
D. To minimize material costs
Explanation: Safety protocols are implemented to prevent accidents during gas fitting operations.
Question 4: When installing underground gas piping, which factor is most critical?
A. The color of the pipe
B. Pipe depth and protection
C. Pipe manufacturer’s logo
D. The installation speed
Explanation: Correct pipe depth and protection are crucial for preventing damage and ensuring
safety in underground installations.
Question 5: What is one of the key components tested during a gas system inspection?
A. The aesthetic finish of the pipe joints
B. The integrity of joints and connections
C. The brand of the tools used
D. The noise level of the installation
Explanation: Inspectors test the integrity of joints and connections to ensure there are no leaks or
faults.
,Question 6: Which of the following best describes the role of MGL 142?
A. It provides building design guidelines
B. It establishes plumbing and gas fitting regulations
C. It governs electrical wiring standards
D. It outlines fire safety procedures
Explanation: MGL 142 establishes the legal framework for plumbing and gas fitting in
Massachusetts.
Question 7: What does 248 CMR primarily address in relation to gas fitting?
A. Financial management
B. Administrative rules and modifications
C. Landscaping regulations
D. Energy consumption
Explanation: 248 CMR contains administrative rules and specific sections on modifications and
equipment standards in gas fitting.
Question 8: Which aspect of gas fitting is directly concerned with excavation procedures?
A. Aesthetic design
B. Safety and excavation
C. Marketing strategy
D. Customer service
Explanation: Safety and excavation procedures ensure that gas piping installation does not
damage existing utilities and prevents accidents.
Question 9: When testing gas equipment, what is the primary objective?
A. To check the color coding of wires
B. To ensure safe and proper operation
C. To evaluate the design style
D. To measure installation speed
Explanation: Testing gas equipment verifies that it operates safely and meets performance
standards.
Question 10: In the context of gas piping design, why is material selection important?
A. It affects the visual appeal only
B. It determines the longevity and safety of the installation
C. It reduces the installation team size
D. It improves marketing potential
Explanation: Selecting the proper materials is essential to ensure long-term durability and safety
of gas piping systems.
Question 11: What does CSST stand for in gas piping installations?
A. Composite Steel Support Tubing
B. Corrugated Stainless Steel Tubing
C. Constructed Silicone Sealant Tubing
D. Controlled Safety Steel Tether
,Explanation: CSST stands for Corrugated Stainless Steel Tubing, used in gas piping systems for
flexibility and durability.
Question 12: Which of the following is a key consideration when installing CSST?
A. Matching the building’s paint scheme
B. Adhering to safety guidelines to prevent damage
C. Increasing the pipe diameter unnecessarily
D. Using it for water piping
Explanation: CSST installation must strictly follow safety guidelines to prevent damage from
accidental contact with metal surfaces.
Question 13: What is the function of a gas piping regulator?
A. To change the pipe’s color
B. To control gas pressure
C. To determine the installation cost
D. To increase gas volume
Explanation: A gas regulator controls the pressure of the gas delivered to appliances ensuring
safe operation.
Question 14: Why is proper combustion air important in gas appliance installations?
A. It improves the visual design
B. It ensures efficient combustion and appliance performance
C. It increases the installation time
D. It minimizes regulatory oversight
Explanation: Adequate combustion air is necessary for efficient burning of gas and optimal
appliance performance.
Question 15: Which step is essential in the purging process of a gas system?
A. Painting the pipes
B. Removing air to prevent explosive mixtures
C. Increasing gas flow speed
D. Doubling the number of pipes
Explanation: Purging involves removing air from the system to avoid creating explosive gas
mixtures during operation.
Question 16: In gas piping, what is the significance of inspecting joints and connections?
A. They determine the installation’s visual appeal
B. They are potential leak points and must be secure
C. They are used only for temporary support
D. They reduce the overall installation cost
Explanation: Secure joints and connections are vital for preventing leaks and ensuring safety.
Question 17: What does the term “modifications” refer to in Sections 4 and 5 of 248 CMR?
A. Changing the color scheme of appliances
B. Alterations to existing gas systems
C. Upgrading electrical wiring
, D. Installing new water fixtures
Explanation: Sections 4 and 5 address modifications, which involve making changes to existing
gas systems while following regulatory guidelines.
Question 18: For gas equipment exceeding 400,000 BTUs, which regulation applies?
A. Section 3 – 248 CMR
B. Section 7 – 248 CMR
C. Section 10 – 248 CMR
D. Section 11 – 248 CMR
Explanation: Section 7 of 248 CMR contains the specific requirements for installing and
operating gas equipment over 400,000 BTUs.
Question 19: Which characteristic distinguishes natural draft venting systems?
A. They require mechanical fans
B. They rely on buoyancy of hot gases
C. They are used exclusively for heating water
D. They require electrical power to operate
Explanation: Natural draft venting systems work by the buoyancy of hot gases, eliminating the
need for mechanical assistance.
Question 20: What is a primary concern when sizing a venting system?
A. Its weight
B. Ensuring proper draft and exhaust flow
C. The number of colors available
D. The installation cost only
Explanation: Correct sizing of a venting system ensures adequate draft and proper exhaust of
combustion gases for safe operation.
Question 21: Which type of venting system is often used with appliances that have forced
air induction?
A. Non-positive venting
B. Positive venting
C. Negative venting
D. Ambient venting
Explanation: Positive venting systems are typically used with appliances that incorporate forced
air induction to expel combustion gases.
Question 22: What does “non-positive venting” imply in gas appliance installations?
A. Venting that relies solely on natural draft
B. Venting enhanced by additional fans
C. Venting that uses mechanical draft only
D. Venting that is not required by code
Explanation: Non-positive venting relies on natural draft without mechanical assistance.
Question 23: Which material is commonly approved for gas venting systems?
A. Galvanized steel with improper sealing
