Gas Fitter Licensing Exam Questions and
Correct Answers Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a gas regulator?
A. Increase gas pressure
B. Reduce and control gas pressure
C. Store gas
D. Measure gas volume
Answer: B
Rationale: A regulator ensures gas is delivered at a safe, usable
pressure.
2. Which gas is most commonly used in residential systems?
A. Oxygen
B. Nitrogen
C. Natural gas
,D. Carbon dioxide
Answer: C
Rationale: Natural gas is the standard fuel for residential heating and
appliances.
3. What does BTU stand for?
A. British Thermal Unit
B. Basic Thermal Usage
C. Burner Temperature Unit
D. Binary Transfer Unit
Answer: A
Rationale: BTU is the amount of heat required to raise the temperature
of water.
4. What type of pipe is commonly used for natural gas distribution?
A. PVC
B. Black steel
C. Copper (uncoated)
D. Aluminum
Answer: B
Rationale: Black steel is durable and commonly approved for gas piping.
,5. What is the purpose of a sediment trap?
A. Increase flow rate
B. Remove moisture and debris
C. Reduce pressure
D. Store excess gas
Answer: B
Rationale: Sediment traps collect debris to prevent damage to
appliances.
6. What should be used to test gas piping for leaks?
A. Water
B. Soap solution
C. Oil
D. Paint
Answer: B
Rationale: Soap bubbles reveal leaks safely without ignition risk.
7. Which instrument measures gas pressure?
A. Thermometer
B. Barometer
, C. Manometer
D. Hydrometer
Answer: C
Rationale: A manometer measures pressure in gas systems.
8. What is the typical pressure of natural gas in residential systems?
A. 100 psi
B. 50 psi
C. 0.25 psi
D. 10 psi
Answer: C
Rationale: Residential systems operate at low pressure, typically 7
inches water column (~0.25 psi).
9. What is required when gas piping passes through a wall?
A. Insulation
B. Sleeve
C. Paint
D. Valve
Answer: B
Rationale: Sleeves protect piping from damage and corrosion.
Correct Answers Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a gas regulator?
A. Increase gas pressure
B. Reduce and control gas pressure
C. Store gas
D. Measure gas volume
Answer: B
Rationale: A regulator ensures gas is delivered at a safe, usable
pressure.
2. Which gas is most commonly used in residential systems?
A. Oxygen
B. Nitrogen
C. Natural gas
,D. Carbon dioxide
Answer: C
Rationale: Natural gas is the standard fuel for residential heating and
appliances.
3. What does BTU stand for?
A. British Thermal Unit
B. Basic Thermal Usage
C. Burner Temperature Unit
D. Binary Transfer Unit
Answer: A
Rationale: BTU is the amount of heat required to raise the temperature
of water.
4. What type of pipe is commonly used for natural gas distribution?
A. PVC
B. Black steel
C. Copper (uncoated)
D. Aluminum
Answer: B
Rationale: Black steel is durable and commonly approved for gas piping.
,5. What is the purpose of a sediment trap?
A. Increase flow rate
B. Remove moisture and debris
C. Reduce pressure
D. Store excess gas
Answer: B
Rationale: Sediment traps collect debris to prevent damage to
appliances.
6. What should be used to test gas piping for leaks?
A. Water
B. Soap solution
C. Oil
D. Paint
Answer: B
Rationale: Soap bubbles reveal leaks safely without ignition risk.
7. Which instrument measures gas pressure?
A. Thermometer
B. Barometer
, C. Manometer
D. Hydrometer
Answer: C
Rationale: A manometer measures pressure in gas systems.
8. What is the typical pressure of natural gas in residential systems?
A. 100 psi
B. 50 psi
C. 0.25 psi
D. 10 psi
Answer: C
Rationale: Residential systems operate at low pressure, typically 7
inches water column (~0.25 psi).
9. What is required when gas piping passes through a wall?
A. Insulation
B. Sleeve
C. Paint
D. Valve
Answer: B
Rationale: Sleeves protect piping from damage and corrosion.
