Arkansas AR/GA Gas Fitter
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales | Complete
Contractor License Exam Prep
Study Guide | Updated 2026
1. What is the primary purpose of a sediment trap in a
gas piping system?
A. Increase gas pressure
B. Reduce pipe diameter
C. Capture dirt, scale, and other debris before it reaches
the appliance gas control
D. Increase combustion air
Correct Answer: Capture dirt, scale, and other debris
before it reaches the appliance gas control
Rationale: A sediment trap helps prevent debris and
condensate from entering appliance controls, valves,
and burners, reducing malfunction and safety hazards.
2. Which gas is commonly supplied to residential
appliances through utility piping?
A. Oxygen
B. Natural gas
C. Carbon monoxide
D. Nitrogen
Correct Answer: Natural gas
Rationale: Natural gas is a commonly distributed fuel
for residential and commercial appliances. It is primarily
,methane with smaller amounts of other hydrocarbons
and gases.
3. What is the purpose of a gas pressure regulator?
A. Remove moisture from gas
B. Increase appliance temperature
C. Control gas pressure to the required downstream
pressure
D. Measure gas volume
Correct Answer: Control gas pressure to the required
downstream pressure
Rationale: Regulators maintain an appropriate
downstream pressure despite variations in inlet
pressure and demand.
4. Before working on a gas appliance, what is the first
major safety consideration?
A. Remove the burner
B. Adjust the thermostat
C. Shut off the fuel supply and establish safe working
conditions
D. Increase gas pressure
Correct Answer: Shut off the fuel supply and establish
safe working conditions
Rationale: The fuel supply must be safely controlled
before disassembly, testing, or repair to prevent fire,
explosion, or uncontrolled gas release.
5. Which material is commonly approved for interior
natural-gas piping when installed according to the
applicable code?
,A. Garden hose
B. PVC drain pipe
C. Schedule 40 steel pipe
D. Vinyl tubing intended for water
Correct Answer: Schedule 40 steel pipe
Rationale: Steel gas piping is a common approved fuel-
gas piping material when the pipe, fittings, joints,
supports, and installation comply with the applicable
code.
6. What does BTU stand for?
A. Basic Thermal Unit
B. British thermal unit
C. Burner Temperature Unit
D. British Transfer Utility
Correct Answer: British thermal unit
Rationale: A British thermal unit is a unit of heat energy
commonly used when describing fuel input and
appliance heating capacity.
7. Approximately how much heat is released by burning
one cubic foot of typical natural gas?
A. 100 Btu
B. 500 Btu
C. About 1,000 Btu
D. About 10,000 Btu
Correct Answer: About 1,000 Btu
Rationale: A commonly used estimating value for
natural gas is approximately 1,000 Btu per cubic foot,
although actual heating value varies by gas composition
and utility.
, 8. What is the purpose of a gas shutoff valve located at
an appliance?
A. Increase gas flow
B. Control water temperature
C. Allow the gas supply to the appliance to be isolated
D. Vent combustion gases
Correct Answer: Allow the gas supply to the appliance to
be isolated
Rationale: An accessible appliance shutoff allows the
appliance to be safely disconnected or serviced without
shutting off the entire building gas supply.
9. What is the primary danger of an uncontrolled
natural-gas leak?
A. Water damage
B. Excess humidity
C. Fire or explosion
D. Pipe corrosion only
Correct Answer: Fire or explosion
Rationale: Escaped natural gas can accumulate and
form a combustible mixture with air. An ignition source
can cause a fire or explosion.
10. Which odorant is commonly added to natural gas to
make leaks easier to detect?
A. Oxygen
B. Chlorine
C. Mercaptan-type odorant
D. Carbon dioxide
Correct Answer: Mercaptan-type odorant
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales | Complete
Contractor License Exam Prep
Study Guide | Updated 2026
1. What is the primary purpose of a sediment trap in a
gas piping system?
A. Increase gas pressure
B. Reduce pipe diameter
C. Capture dirt, scale, and other debris before it reaches
the appliance gas control
D. Increase combustion air
Correct Answer: Capture dirt, scale, and other debris
before it reaches the appliance gas control
Rationale: A sediment trap helps prevent debris and
condensate from entering appliance controls, valves,
and burners, reducing malfunction and safety hazards.
2. Which gas is commonly supplied to residential
appliances through utility piping?
A. Oxygen
B. Natural gas
C. Carbon monoxide
D. Nitrogen
Correct Answer: Natural gas
Rationale: Natural gas is a commonly distributed fuel
for residential and commercial appliances. It is primarily
,methane with smaller amounts of other hydrocarbons
and gases.
3. What is the purpose of a gas pressure regulator?
A. Remove moisture from gas
B. Increase appliance temperature
C. Control gas pressure to the required downstream
pressure
D. Measure gas volume
Correct Answer: Control gas pressure to the required
downstream pressure
Rationale: Regulators maintain an appropriate
downstream pressure despite variations in inlet
pressure and demand.
4. Before working on a gas appliance, what is the first
major safety consideration?
A. Remove the burner
B. Adjust the thermostat
C. Shut off the fuel supply and establish safe working
conditions
D. Increase gas pressure
Correct Answer: Shut off the fuel supply and establish
safe working conditions
Rationale: The fuel supply must be safely controlled
before disassembly, testing, or repair to prevent fire,
explosion, or uncontrolled gas release.
5. Which material is commonly approved for interior
natural-gas piping when installed according to the
applicable code?
,A. Garden hose
B. PVC drain pipe
C. Schedule 40 steel pipe
D. Vinyl tubing intended for water
Correct Answer: Schedule 40 steel pipe
Rationale: Steel gas piping is a common approved fuel-
gas piping material when the pipe, fittings, joints,
supports, and installation comply with the applicable
code.
6. What does BTU stand for?
A. Basic Thermal Unit
B. British thermal unit
C. Burner Temperature Unit
D. British Transfer Utility
Correct Answer: British thermal unit
Rationale: A British thermal unit is a unit of heat energy
commonly used when describing fuel input and
appliance heating capacity.
7. Approximately how much heat is released by burning
one cubic foot of typical natural gas?
A. 100 Btu
B. 500 Btu
C. About 1,000 Btu
D. About 10,000 Btu
Correct Answer: About 1,000 Btu
Rationale: A commonly used estimating value for
natural gas is approximately 1,000 Btu per cubic foot,
although actual heating value varies by gas composition
and utility.
, 8. What is the purpose of a gas shutoff valve located at
an appliance?
A. Increase gas flow
B. Control water temperature
C. Allow the gas supply to the appliance to be isolated
D. Vent combustion gases
Correct Answer: Allow the gas supply to the appliance to
be isolated
Rationale: An accessible appliance shutoff allows the
appliance to be safely disconnected or serviced without
shutting off the entire building gas supply.
9. What is the primary danger of an uncontrolled
natural-gas leak?
A. Water damage
B. Excess humidity
C. Fire or explosion
D. Pipe corrosion only
Correct Answer: Fire or explosion
Rationale: Escaped natural gas can accumulate and
form a combustible mixture with air. An ignition source
can cause a fire or explosion.
10. Which odorant is commonly added to natural gas to
make leaks easier to detect?
A. Oxygen
B. Chlorine
C. Mercaptan-type odorant
D. Carbon dioxide
Correct Answer: Mercaptan-type odorant
