Massachusetts Master Gas Fitter Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1.
What is the primary purpose of a gas pressure regulator in a fuel gas
system?
A. Increase gas temperature
B. Reduce and maintain gas pressure at a safe operating level
C. Filter impurities from gas
D. Measure gas consumption
Rationale: A regulator reduces incoming high-pressure gas to a lower,
stable pressure suitable for appliance operation and system safety.
2.
,Which standard is most commonly adopted for fuel gas piping systems
in Massachusetts?
A. NFPA 70
B. NFPA 54
C. NFPA 13
D. NFPA 101
Rationale: NFPA 54 (National Fuel Gas Code) governs installation and
operation of fuel gas systems.
3.
A gas piping system must be tested at what minimum pressure for a
standard rough inspection?
A. 1 psi
B. 3 psi
C. 10 psi
D. 25 psi
Rationale: Most jurisdictions, including MA practices, require a 10 psi air
test for low-pressure gas systems.
,4.
What is the most common cause of incomplete combustion in gas
appliances?
A. Excess gas pressure
B. Clean burners
C. Insufficient air supply
D. Oversized flue pipe
Rationale: Lack of oxygen leads to incomplete combustion and potential
carbon monoxide production.
5.
Which gas is primarily produced by incomplete combustion?
A. Oxygen
B. Carbon monoxide
C. Nitrogen
D. Hydrogen
Rationale: Carbon monoxide is a toxic byproduct of incomplete
combustion.
, 6.
What is the purpose of combustion air?
A. Cool the appliance
B. Support proper fuel burning
C. Increase gas pressure
D. Reduce vent size
Rationale: Combustion air supplies oxygen required for complete fuel
combustion.
7.
Which material is approved for indoor gas piping?
A. PVC
B. Black steel pipe
C. ABS
D. Aluminum tubing (non-rated)
Rationale: Black steel pipe is commonly approved for gas distribution
indoors.
8.
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1.
What is the primary purpose of a gas pressure regulator in a fuel gas
system?
A. Increase gas temperature
B. Reduce and maintain gas pressure at a safe operating level
C. Filter impurities from gas
D. Measure gas consumption
Rationale: A regulator reduces incoming high-pressure gas to a lower,
stable pressure suitable for appliance operation and system safety.
2.
,Which standard is most commonly adopted for fuel gas piping systems
in Massachusetts?
A. NFPA 70
B. NFPA 54
C. NFPA 13
D. NFPA 101
Rationale: NFPA 54 (National Fuel Gas Code) governs installation and
operation of fuel gas systems.
3.
A gas piping system must be tested at what minimum pressure for a
standard rough inspection?
A. 1 psi
B. 3 psi
C. 10 psi
D. 25 psi
Rationale: Most jurisdictions, including MA practices, require a 10 psi air
test for low-pressure gas systems.
,4.
What is the most common cause of incomplete combustion in gas
appliances?
A. Excess gas pressure
B. Clean burners
C. Insufficient air supply
D. Oversized flue pipe
Rationale: Lack of oxygen leads to incomplete combustion and potential
carbon monoxide production.
5.
Which gas is primarily produced by incomplete combustion?
A. Oxygen
B. Carbon monoxide
C. Nitrogen
D. Hydrogen
Rationale: Carbon monoxide is a toxic byproduct of incomplete
combustion.
, 6.
What is the purpose of combustion air?
A. Cool the appliance
B. Support proper fuel burning
C. Increase gas pressure
D. Reduce vent size
Rationale: Combustion air supplies oxygen required for complete fuel
combustion.
7.
Which material is approved for indoor gas piping?
A. PVC
B. Black steel pipe
C. ABS
D. Aluminum tubing (non-rated)
Rationale: Black steel pipe is commonly approved for gas distribution
indoors.
8.
