ALABAMA GAS FITTER EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas shutoff valve installed
for an appliance?
A. To increase gas pressure
B. To isolate the appliance from the gas supply
C. To regulate room temperature
D. To increase combustion air
Answer: B. To isolate the appliance from the gas supply
Rationale: A shutoff valve allows the gas supply to an appliance
to be stopped for servicing, maintenance, or emergencies.
2. Which gas is commonly used as a fuel in residential natural-
gas piping systems?
A. Oxygen
B. Nitrogen
C. Methane
D. Carbon dioxide
Answer: C. Methane
Rationale: Natural gas consists primarily of methane, although
commercial natural gas contains smaller amounts of other
hydrocarbons and gases.
,3. What is the purpose of a gas pressure regulator?
A. To remove water from gas
B. To maintain an appropriate downstream gas pressure
C. To increase pipe diameter
D. To provide electrical grounding
Answer: B. To maintain an appropriate downstream gas
pressure
Rationale: Regulators control gas pressure so appliances
receive gas within their specified operating range.
4. What is the most important consideration when selecting
gas piping material?
A. Its color
B. Its compatibility with the fuel gas and applicable code
C. Its weight alone
D. Its appearance
Answer: B. Its compatibility with the fuel gas and applicable
code
Rationale: Piping must be approved for the intended fuel and
installation conditions and comply with the applicable code.
5. What does BTU stand for?
,A. British Thermal Unit
B. Basic Temperature Unit
C. British Transfer Utility
D. Burner Thermal Utility
Answer: A. British Thermal Unit
Rationale: A BTU is a unit of heat energy commonly used to
express the input or heating capacity of gas appliances.
6. What condition can result when an appliance receives
insufficient combustion air?
A. Perfect combustion
B. Increased oxygen production
C. Incomplete combustion
D. Lower carbon monoxide production
Answer: C. Incomplete combustion
Rationale: Insufficient combustion air can cause incomplete
combustion and potentially produce dangerous carbon
monoxide.
7. What is carbon monoxide (CO)?
A. A harmless fuel gas
B. A poisonous product of incomplete combustion
C. A pipe sealant
D. A type of natural gas regulator
, Answer: B. A poisonous product of incomplete combustion
Rationale: Carbon monoxide is colorless and odorless and can
be produced when carbon-containing fuels do not burn
completely.
8. What is the purpose of combustion air?
A. To cool the gas meter
B. To provide oxygen necessary for proper combustion
C. To increase gas pressure
D. To lubricate the burner
Answer: B. To provide oxygen necessary for proper
combustion
Rationale: Gas combustion requires an adequate supply of
oxygen.
9. What should be done if a gas leak is suspected inside a
building?
A. Operate electrical switches to investigate
B. Use an open flame to locate the leak
C. Eliminate ignition sources and follow emergency procedures
D. Increase the gas pressure
Answer: C. Eliminate ignition sources and follow emergency
procedures
Rationale: Ignition sources can ignite accumulated gas. The
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas shutoff valve installed
for an appliance?
A. To increase gas pressure
B. To isolate the appliance from the gas supply
C. To regulate room temperature
D. To increase combustion air
Answer: B. To isolate the appliance from the gas supply
Rationale: A shutoff valve allows the gas supply to an appliance
to be stopped for servicing, maintenance, or emergencies.
2. Which gas is commonly used as a fuel in residential natural-
gas piping systems?
A. Oxygen
B. Nitrogen
C. Methane
D. Carbon dioxide
Answer: C. Methane
Rationale: Natural gas consists primarily of methane, although
commercial natural gas contains smaller amounts of other
hydrocarbons and gases.
,3. What is the purpose of a gas pressure regulator?
A. To remove water from gas
B. To maintain an appropriate downstream gas pressure
C. To increase pipe diameter
D. To provide electrical grounding
Answer: B. To maintain an appropriate downstream gas
pressure
Rationale: Regulators control gas pressure so appliances
receive gas within their specified operating range.
4. What is the most important consideration when selecting
gas piping material?
A. Its color
B. Its compatibility with the fuel gas and applicable code
C. Its weight alone
D. Its appearance
Answer: B. Its compatibility with the fuel gas and applicable
code
Rationale: Piping must be approved for the intended fuel and
installation conditions and comply with the applicable code.
5. What does BTU stand for?
,A. British Thermal Unit
B. Basic Temperature Unit
C. British Transfer Utility
D. Burner Thermal Utility
Answer: A. British Thermal Unit
Rationale: A BTU is a unit of heat energy commonly used to
express the input or heating capacity of gas appliances.
6. What condition can result when an appliance receives
insufficient combustion air?
A. Perfect combustion
B. Increased oxygen production
C. Incomplete combustion
D. Lower carbon monoxide production
Answer: C. Incomplete combustion
Rationale: Insufficient combustion air can cause incomplete
combustion and potentially produce dangerous carbon
monoxide.
7. What is carbon monoxide (CO)?
A. A harmless fuel gas
B. A poisonous product of incomplete combustion
C. A pipe sealant
D. A type of natural gas regulator
, Answer: B. A poisonous product of incomplete combustion
Rationale: Carbon monoxide is colorless and odorless and can
be produced when carbon-containing fuels do not burn
completely.
8. What is the purpose of combustion air?
A. To cool the gas meter
B. To provide oxygen necessary for proper combustion
C. To increase gas pressure
D. To lubricate the burner
Answer: B. To provide oxygen necessary for proper
combustion
Rationale: Gas combustion requires an adequate supply of
oxygen.
9. What should be done if a gas leak is suspected inside a
building?
A. Operate electrical switches to investigate
B. Use an open flame to locate the leak
C. Eliminate ignition sources and follow emergency procedures
D. Increase the gas pressure
Answer: C. Eliminate ignition sources and follow emergency
procedures
Rationale: Ignition sources can ignite accumulated gas. The
