COLORADO GAS FITTER LICENSING EXAM
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas regulator in a gas
system?
A. Increase gas pressure
B. Control and reduce gas pressure to safe levels
C. Measure gas flow rate
D. Filter impurities
Rationale: A regulator ensures appliances receive gas at a safe
and consistent pressure.
Correct Answer: B. Control and reduce gas pressure to safe
levels
2. Which gas is commonly supplied to residential homes?
A. Oxygen
B. Carbon dioxide
C. Natural gas (methane)
D. Hydrogen
Rationale: Residential systems typically use natural gas, mainly
methane.
Correct Answer: C. Natural gas (methane)
,3. What is the minimum required pressure for most
residential natural gas appliances?
A. 2 psi
B. 7 inches water column
C. 50 psi
D. 10 psi
Rationale: Most residential appliances operate at low pressure
measured in inches of water column.
Correct Answer: B. 7 inches water column
4. What tool is used to detect gas leaks?
A. Multimeter
B. Combustion analyzer
C. Gas leak detector solution (soap solution)
D. Tachometer
Rationale: Soap solution or electronic detectors identify
escaping gas.
Correct Answer: C. Gas leak detector solution (soap solution)
5. What color is commonly used to identify natural gas piping
in marking systems?
A. Red
B. Yellow
,C. Blue
D. Green
Rationale: Yellow is widely used for gas piping identification.
Correct Answer: B. Yellow
6. What is the main hazard associated with gas leaks?
A. Radiation
B. Explosion or fire
C. Electrical shock
D. Freezing pipes
Rationale: Escaping gas can ignite and cause explosions or fires.
Correct Answer: B. Explosion or fire
7. What device prevents backflow in a gas system?
A. Regulator
B. Check valve
C. Pressure gauge
D. Burner
Rationale: Check valves ensure gas flows in one direction only.
Correct Answer: B. Check valve
8. Which pipe material is commonly approved for gas
distribution?
, A. PVC
B. Copper tubing (approved applications)
C. Cardboard tubing
D. Glass piping
Rationale: Approved metals like copper and steel are used for
gas lines.
Correct Answer: B. Copper tubing (approved applications)
9. What is the purpose of pipe threading compound?
A. Increase gas flow
B. Seal threaded joints to prevent leaks
C. Cool pipes
D. Clean pipes internally
Rationale: Thread sealant ensures airtight joints.
Correct Answer: B. Seal threaded joints to prevent leaks
10. What does BTU stand for in gas systems?
A. British Thermal Unit
B. Basic Temperature Unit
C. Burner Transfer Unit
D. Balanced Thermal Usage
Rationale: BTU measures heat energy.
Correct Answer: A. British Thermal Unit
QUESTIONS AND CORRECT ANSWERS (VERIFIED
ANSWERS) Q&A 2026 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas regulator in a gas
system?
A. Increase gas pressure
B. Control and reduce gas pressure to safe levels
C. Measure gas flow rate
D. Filter impurities
Rationale: A regulator ensures appliances receive gas at a safe
and consistent pressure.
Correct Answer: B. Control and reduce gas pressure to safe
levels
2. Which gas is commonly supplied to residential homes?
A. Oxygen
B. Carbon dioxide
C. Natural gas (methane)
D. Hydrogen
Rationale: Residential systems typically use natural gas, mainly
methane.
Correct Answer: C. Natural gas (methane)
,3. What is the minimum required pressure for most
residential natural gas appliances?
A. 2 psi
B. 7 inches water column
C. 50 psi
D. 10 psi
Rationale: Most residential appliances operate at low pressure
measured in inches of water column.
Correct Answer: B. 7 inches water column
4. What tool is used to detect gas leaks?
A. Multimeter
B. Combustion analyzer
C. Gas leak detector solution (soap solution)
D. Tachometer
Rationale: Soap solution or electronic detectors identify
escaping gas.
Correct Answer: C. Gas leak detector solution (soap solution)
5. What color is commonly used to identify natural gas piping
in marking systems?
A. Red
B. Yellow
,C. Blue
D. Green
Rationale: Yellow is widely used for gas piping identification.
Correct Answer: B. Yellow
6. What is the main hazard associated with gas leaks?
A. Radiation
B. Explosion or fire
C. Electrical shock
D. Freezing pipes
Rationale: Escaping gas can ignite and cause explosions or fires.
Correct Answer: B. Explosion or fire
7. What device prevents backflow in a gas system?
A. Regulator
B. Check valve
C. Pressure gauge
D. Burner
Rationale: Check valves ensure gas flows in one direction only.
Correct Answer: B. Check valve
8. Which pipe material is commonly approved for gas
distribution?
, A. PVC
B. Copper tubing (approved applications)
C. Cardboard tubing
D. Glass piping
Rationale: Approved metals like copper and steel are used for
gas lines.
Correct Answer: B. Copper tubing (approved applications)
9. What is the purpose of pipe threading compound?
A. Increase gas flow
B. Seal threaded joints to prevent leaks
C. Cool pipes
D. Clean pipes internally
Rationale: Thread sealant ensures airtight joints.
Correct Answer: B. Seal threaded joints to prevent leaks
10. What does BTU stand for in gas systems?
A. British Thermal Unit
B. Basic Temperature Unit
C. Burner Transfer Unit
D. Balanced Thermal Usage
Rationale: BTU measures heat energy.
Correct Answer: A. British Thermal Unit
