Massachusetts Journeyman Gas Fitter
Exam Practice Questions And Correct
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Rationales 2026 Q&A Instant Download
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1. What is the maximum allowable working pressure for a residential natural
gas system in Massachusetts?
A. 1 psi
B. 5 psi
C. 10 psi
D. 15 psi
A. 1 psi
Rationale: Residential natural gas systems are limited to 1 psi for safety
and code compliance.
2. Which material is commonly approved for underground gas piping in
Massachusetts?
A. PVC
B. CSST
C. Black steel
D. Copper
C. Black steel
, Rationale: Black steel is standard for underground gas piping due to its
strength and resistance to corrosion.
3. What is the minimum clearance required between a gas meter and an
ignition source?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
C. 24 inches
Rationale: Massachusetts gas codes require at least 24 inches to reduce
fire hazards.
4. CSST piping must be bonded to prevent which type of hazard?
A. Water contamination
B. Electrical shock
C. Lightning strike
D. Gas leakage
C. Lightning strike
Rationale: CSST can be punctured by lightning-induced surges if not
properly bonded.
5. When testing a new gas line for leaks, what is the recommended test
medium?
A. Air at 50 psi
B. Natural gas at operating pressure
C. Soap solution
D. Nitrogen or air under low pressure
D. Nitrogen or air under low pressure
Rationale: Non-flammable gases like nitrogen are safer for leak testing
new installations.
6. What is the minimum slope required for a gas piping system to ensure
proper drainage?
A. 1/8 inch per foot
, B. 1/4 inch per foot
C. 1/2 inch per foot
D. No slope required
B. 1/4 inch per foot
Rationale: A slight slope ensures condensate drains properly and prevents
accumulation in low spots.
7. Which type of gas regulator is typically installed at a residential service?
A. Pressure-reducing regulator
B. Safety relief regulator
C. Overpressure regulator
D. Multi-stage regulator
A. Pressure-reducing regulator
Rationale: Residential service regulators reduce utility pressure to a safe
operating level for appliances.
8. What is the minimum distance a gas appliance vent must extend above the
roofline?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
B. 12 inches
Rationale: Venting codes require 12 inches above the roof to ensure
proper draft and dispersion of combustion gases.
9. For indoor gas piping, what is the maximum allowable gas pressure in
Massachusetts?
A. 0.5 psi
B. 1 psi
C. 5 psi
D. 10 psi
B. 1 psi
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
1. What is the maximum allowable working pressure for a residential natural
gas system in Massachusetts?
A. 1 psi
B. 5 psi
C. 10 psi
D. 15 psi
A. 1 psi
Rationale: Residential natural gas systems are limited to 1 psi for safety
and code compliance.
2. Which material is commonly approved for underground gas piping in
Massachusetts?
A. PVC
B. CSST
C. Black steel
D. Copper
C. Black steel
, Rationale: Black steel is standard for underground gas piping due to its
strength and resistance to corrosion.
3. What is the minimum clearance required between a gas meter and an
ignition source?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
C. 24 inches
Rationale: Massachusetts gas codes require at least 24 inches to reduce
fire hazards.
4. CSST piping must be bonded to prevent which type of hazard?
A. Water contamination
B. Electrical shock
C. Lightning strike
D. Gas leakage
C. Lightning strike
Rationale: CSST can be punctured by lightning-induced surges if not
properly bonded.
5. When testing a new gas line for leaks, what is the recommended test
medium?
A. Air at 50 psi
B. Natural gas at operating pressure
C. Soap solution
D. Nitrogen or air under low pressure
D. Nitrogen or air under low pressure
Rationale: Non-flammable gases like nitrogen are safer for leak testing
new installations.
6. What is the minimum slope required for a gas piping system to ensure
proper drainage?
A. 1/8 inch per foot
, B. 1/4 inch per foot
C. 1/2 inch per foot
D. No slope required
B. 1/4 inch per foot
Rationale: A slight slope ensures condensate drains properly and prevents
accumulation in low spots.
7. Which type of gas regulator is typically installed at a residential service?
A. Pressure-reducing regulator
B. Safety relief regulator
C. Overpressure regulator
D. Multi-stage regulator
A. Pressure-reducing regulator
Rationale: Residential service regulators reduce utility pressure to a safe
operating level for appliances.
8. What is the minimum distance a gas appliance vent must extend above the
roofline?
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
B. 12 inches
Rationale: Venting codes require 12 inches above the roof to ensure
proper draft and dispersion of combustion gases.
9. For indoor gas piping, what is the maximum allowable gas pressure in
Massachusetts?
A. 0.5 psi
B. 1 psi
C. 5 psi
D. 10 psi
B. 1 psi
