MA MASTER GAS FITTER EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026/2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas regulator?
A. Increase gas pressure
B. Measure gas flow
C. Reduce and maintain gas pressure
D. Stop gas combustion
Correct Answer: C. Reduce and maintain gas pressure.
Rationale: Gas regulators lower supply pressure to the correct
operating pressure and maintain it despite changes in demand.
2. Which fuel gas is lighter than air?
A. Propane
B. Butane
C. Natural gas
D. LPG
Correct Answer: C. Natural gas.
Rationale: Natural gas rises because it is lighter than air, while
propane and butane are heavier and collect in low areas.
,3. Which fitting is commonly used to connect black steel gas
pipe?
A. PVC coupling
B. Cast iron hub
C. Threaded malleable iron fitting
D. Copper sweat fitting
Correct Answer: C. Threaded malleable iron fitting.
Rationale: Threaded malleable iron fittings are standard for
threaded steel gas piping systems.
4. Before placing a gas piping system into service, it must first
be:
A. Painted
B. Flushed
C. Pressure tested
D. Insulated
Correct Answer: C. Pressure tested.
Rationale: Pressure testing verifies the system is leak-free
before introducing fuel gas.
,5. What instrument is commonly used to measure gas
pressure?
A. Thermometer
B. Hygrometer
C. Manometer
D. Voltmeter
Correct Answer: C. Manometer.
Rationale: Manometers accurately measure low gas pressures.
6. Which valve is typically installed at each appliance?
A. Check valve
B. Ball shutoff valve
C. Relief valve
D. Butterfly valve
Correct Answer: B. Ball shutoff valve.
Rationale: Appliance shutoff valves allow servicing without
shutting down the entire gas system.
7. Which gas has an odorant added for leak detection?
A. Oxygen
B. Nitrogen
, C. Natural gas
D. Carbon dioxide
Correct Answer: C. Natural gas.
Rationale: Mercaptan is added to natural gas because natural
gas is naturally odorless.
8. Pipe sizing is primarily based on:
A. Pipe color
B. Appliance BTU demand
C. Building height only
D. Pipe manufacturer
Correct Answer: B. Appliance BTU demand.
Rationale: Pipe sizing depends on gas demand, pressure, and
piping length.
9. One cubic foot of natural gas contains approximately:
A. 100 BTUs
B. 1,000 BTUs
C. 10,000 BTUs
D. 50 BTUs
Correct Answer: B. 1,000 BTUs.
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2026/2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas regulator?
A. Increase gas pressure
B. Measure gas flow
C. Reduce and maintain gas pressure
D. Stop gas combustion
Correct Answer: C. Reduce and maintain gas pressure.
Rationale: Gas regulators lower supply pressure to the correct
operating pressure and maintain it despite changes in demand.
2. Which fuel gas is lighter than air?
A. Propane
B. Butane
C. Natural gas
D. LPG
Correct Answer: C. Natural gas.
Rationale: Natural gas rises because it is lighter than air, while
propane and butane are heavier and collect in low areas.
,3. Which fitting is commonly used to connect black steel gas
pipe?
A. PVC coupling
B. Cast iron hub
C. Threaded malleable iron fitting
D. Copper sweat fitting
Correct Answer: C. Threaded malleable iron fitting.
Rationale: Threaded malleable iron fittings are standard for
threaded steel gas piping systems.
4. Before placing a gas piping system into service, it must first
be:
A. Painted
B. Flushed
C. Pressure tested
D. Insulated
Correct Answer: C. Pressure tested.
Rationale: Pressure testing verifies the system is leak-free
before introducing fuel gas.
,5. What instrument is commonly used to measure gas
pressure?
A. Thermometer
B. Hygrometer
C. Manometer
D. Voltmeter
Correct Answer: C. Manometer.
Rationale: Manometers accurately measure low gas pressures.
6. Which valve is typically installed at each appliance?
A. Check valve
B. Ball shutoff valve
C. Relief valve
D. Butterfly valve
Correct Answer: B. Ball shutoff valve.
Rationale: Appliance shutoff valves allow servicing without
shutting down the entire gas system.
7. Which gas has an odorant added for leak detection?
A. Oxygen
B. Nitrogen
, C. Natural gas
D. Carbon dioxide
Correct Answer: C. Natural gas.
Rationale: Mercaptan is added to natural gas because natural
gas is naturally odorless.
8. Pipe sizing is primarily based on:
A. Pipe color
B. Appliance BTU demand
C. Building height only
D. Pipe manufacturer
Correct Answer: B. Appliance BTU demand.
Rationale: Pipe sizing depends on gas demand, pressure, and
piping length.
9. One cubic foot of natural gas contains approximately:
A. 100 BTUs
B. 1,000 BTUs
C. 10,000 BTUs
D. 50 BTUs
Correct Answer: B. 1,000 BTUs.
