AR GA Gas Fitter Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of gas is commonly used for residential heating?
A. Propane
B. Natural Gas
C. Hydrogen
D. Oxygen
Answer: B. Natural Gas
Rationale: Natural gas is widely used in residential heating due to its
availability, cost-effectiveness, and safety profile compared to other gases.
2. What is the primary purpose of a gas pressure regulator?
A. Increase gas flow
B. Measure gas volume
C. Maintain consistent gas pressure
D. Filter impurities
Answer: C. Maintain consistent gas pressure
Rationale: A regulator ensures the gas pressure remains within safe
operating limits for appliances.
3. What is the minimum distance required between a gas meter and an
electrical meter?
, A. 6 inches
B. 12 inches
C. 12 inches horizontally
D. 24 inches vertically
Answer: C. 12 inches horizontally
Rationale: Codes require separation to prevent hazards from sparks or
maintenance interference.
4. Which fitting is commonly used to connect two pipes of different sizes?
A. Elbow
B. Coupling
C. Reducer
D. Tee
Answer: C. Reducer
Rationale: Reducers allow safe and proper transition between pipes of
different diameters.
5. In gas piping, black steel pipe is primarily used for:
A. Water supply
B. Natural gas distribution
C. Air conditioning
D. Sewage
Answer: B. Natural gas distribution
Rationale: Black steel pipes are durable and suitable for natural gas due to
pressure handling and corrosion resistance.
6. What is the main hazard when working with gas piping?
A. Water leaks
B. Electrical shock
C. Explosion or fire
D. Corrosion
Answer: C. Explosion or fire
Rationale: Gas leaks can lead to accumulation and ignition, making fire or
explosion the primary hazard.
, 7. What tool is used to detect small gas leaks in a pipe?
A. Wrench
B. Multimeter
C. Soap solution
D. Hammer
Answer: C. Soap solution
Rationale: Soap solution forms bubbles at leak points, visually indicating
gas escape.
8. When soldering copper gas pipes, which flux should be used?
A. Acid flux
B. Rosin-based flux
C. Water-based flux
D. No flux
Answer: B. Rosin-based flux
Rationale: Rosin flux is safe for gas applications and prevents corrosion
while enabling proper solder flow.
9. What is the primary function of a gas shut-off valve?
A. Increase pressure
B. Regulate flow
C. Stop gas flow
D. Measure consumption
Answer: C. Stop gas flow
Rationale: Shut-off valves provide safety during maintenance or emergencies
by stopping gas supply.
10. Which type of gas leak detector uses a catalytic sensor?
A. Infrared detector
B. Ultrasonic detector
C. Combustible gas detector
D. Smoke detector
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of gas is commonly used for residential heating?
A. Propane
B. Natural Gas
C. Hydrogen
D. Oxygen
Answer: B. Natural Gas
Rationale: Natural gas is widely used in residential heating due to its
availability, cost-effectiveness, and safety profile compared to other gases.
2. What is the primary purpose of a gas pressure regulator?
A. Increase gas flow
B. Measure gas volume
C. Maintain consistent gas pressure
D. Filter impurities
Answer: C. Maintain consistent gas pressure
Rationale: A regulator ensures the gas pressure remains within safe
operating limits for appliances.
3. What is the minimum distance required between a gas meter and an
electrical meter?
, A. 6 inches
B. 12 inches
C. 12 inches horizontally
D. 24 inches vertically
Answer: C. 12 inches horizontally
Rationale: Codes require separation to prevent hazards from sparks or
maintenance interference.
4. Which fitting is commonly used to connect two pipes of different sizes?
A. Elbow
B. Coupling
C. Reducer
D. Tee
Answer: C. Reducer
Rationale: Reducers allow safe and proper transition between pipes of
different diameters.
5. In gas piping, black steel pipe is primarily used for:
A. Water supply
B. Natural gas distribution
C. Air conditioning
D. Sewage
Answer: B. Natural gas distribution
Rationale: Black steel pipes are durable and suitable for natural gas due to
pressure handling and corrosion resistance.
6. What is the main hazard when working with gas piping?
A. Water leaks
B. Electrical shock
C. Explosion or fire
D. Corrosion
Answer: C. Explosion or fire
Rationale: Gas leaks can lead to accumulation and ignition, making fire or
explosion the primary hazard.
, 7. What tool is used to detect small gas leaks in a pipe?
A. Wrench
B. Multimeter
C. Soap solution
D. Hammer
Answer: C. Soap solution
Rationale: Soap solution forms bubbles at leak points, visually indicating
gas escape.
8. When soldering copper gas pipes, which flux should be used?
A. Acid flux
B. Rosin-based flux
C. Water-based flux
D. No flux
Answer: B. Rosin-based flux
Rationale: Rosin flux is safe for gas applications and prevents corrosion
while enabling proper solder flow.
9. What is the primary function of a gas shut-off valve?
A. Increase pressure
B. Regulate flow
C. Stop gas flow
D. Measure consumption
Answer: C. Stop gas flow
Rationale: Shut-off valves provide safety during maintenance or emergencies
by stopping gas supply.
10. Which type of gas leak detector uses a catalytic sensor?
A. Infrared detector
B. Ultrasonic detector
C. Combustible gas detector
D. Smoke detector
