Nevada Gas Fitter Licensing Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following gases is most commonly used in residential
heating systems?
A. Acetylene
B. Propane
C. Natural Gas
D. Hydrogen
Natural gas is the primary fuel used in residential heating systems
due to its availability, cost-effectiveness, and combustion efficiency.
2. What is the minimum distance a gas meter must be installed from an
ignition source?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Codes require that gas meters be installed at least 5 feet away from
ignition sources to prevent accidental fires or explosions.
3. Which type of pipe is most commonly used for natural gas distribution
inside homes?
A. PVC
B. CSST (Corrugated Stainless Steel Tubing)
C. Copper tubing for water
D. Aluminum tubing
CSST is widely used for interior gas piping due to its flexibility and
compliance with building codes.
,4. The function of a gas regulator is to:
A. Filter the gas
B. Increase gas pressure
C. Maintain consistent gas pressure
D. Convert gas to liquid
A gas regulator ensures that gas is delivered at a safe and consistent
pressure to appliances.
5. What is the primary hazard associated with a natural gas leak?
A. Freezing
B. Explosion or fire
C. Electric shock
D. Structural collapse
Natural gas is highly flammable; leaks can lead to explosions or fires
if ignited.
6. When testing a gas line for leaks using a soapy water solution, bubbles
indicate:
A. Proper gas flow
B. A leak in the gas line
C. Blockage in the pipe
D. Low pressure
Soap solution bubbles form when gas escapes from a leak, signaling
the need for repair.
7. Which of the following tools is essential for connecting CSST fittings?
A. Pipe wrench
B. Hammer
C. Torque wrench
D. Hacksaw
A torque wrench ensures fittings are tightened to manufacturer
specifications, preventing leaks.
8. According to Nevada code, who is authorized to perform gas fitting
work?
A. Any licensed plumber
B. A licensed gas fitter
C. A general contractor
D. A homeowner
, Nevada law requires gas work to be performed only by licensed gas
fitters to ensure safety.
9. What is the maximum allowable pressure for a residential natural gas
system?
A. 1 psi
B. 3 psi
C. 0.5 psi
D. 2 psi
Residential gas systems are designed for low pressure, typically 0.5
psi or less, to ensure safe operation.
10. When installing a gas appliance, the venting must:
A. Be painted black
B. Properly exhaust combustion gases outdoors
C. Be flexible plastic
D. Terminate in a basement
Correct venting directs combustion gases outdoors, preventing
carbon monoxide buildup indoors.
11. What device is used to prevent gas from flowing back into the
main supply line?
A. Pressure gauge
B. Gas meter
C. Check valve
D. Flow restrictor
A check valve allows gas flow in one direction only, preventing
backflow into the supply line.
12. Which type of gas detection system is required in commercial
kitchens?
A. Smoke detector
B. Fixed gas detector
C. Carbon monoxide detector only
D. Flame detector
Commercial kitchens require fixed gas detectors to alert personnel of
leaks promptly.
13. The proper action if a gas leak is detected inside a home is to:
A. Turn on lights to see the source
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following gases is most commonly used in residential
heating systems?
A. Acetylene
B. Propane
C. Natural Gas
D. Hydrogen
Natural gas is the primary fuel used in residential heating systems
due to its availability, cost-effectiveness, and combustion efficiency.
2. What is the minimum distance a gas meter must be installed from an
ignition source?
A. 1 foot
B. 3 feet
C. 5 feet
D. 10 feet
Codes require that gas meters be installed at least 5 feet away from
ignition sources to prevent accidental fires or explosions.
3. Which type of pipe is most commonly used for natural gas distribution
inside homes?
A. PVC
B. CSST (Corrugated Stainless Steel Tubing)
C. Copper tubing for water
D. Aluminum tubing
CSST is widely used for interior gas piping due to its flexibility and
compliance with building codes.
,4. The function of a gas regulator is to:
A. Filter the gas
B. Increase gas pressure
C. Maintain consistent gas pressure
D. Convert gas to liquid
A gas regulator ensures that gas is delivered at a safe and consistent
pressure to appliances.
5. What is the primary hazard associated with a natural gas leak?
A. Freezing
B. Explosion or fire
C. Electric shock
D. Structural collapse
Natural gas is highly flammable; leaks can lead to explosions or fires
if ignited.
6. When testing a gas line for leaks using a soapy water solution, bubbles
indicate:
A. Proper gas flow
B. A leak in the gas line
C. Blockage in the pipe
D. Low pressure
Soap solution bubbles form when gas escapes from a leak, signaling
the need for repair.
7. Which of the following tools is essential for connecting CSST fittings?
A. Pipe wrench
B. Hammer
C. Torque wrench
D. Hacksaw
A torque wrench ensures fittings are tightened to manufacturer
specifications, preventing leaks.
8. According to Nevada code, who is authorized to perform gas fitting
work?
A. Any licensed plumber
B. A licensed gas fitter
C. A general contractor
D. A homeowner
, Nevada law requires gas work to be performed only by licensed gas
fitters to ensure safety.
9. What is the maximum allowable pressure for a residential natural gas
system?
A. 1 psi
B. 3 psi
C. 0.5 psi
D. 2 psi
Residential gas systems are designed for low pressure, typically 0.5
psi or less, to ensure safe operation.
10. When installing a gas appliance, the venting must:
A. Be painted black
B. Properly exhaust combustion gases outdoors
C. Be flexible plastic
D. Terminate in a basement
Correct venting directs combustion gases outdoors, preventing
carbon monoxide buildup indoors.
11. What device is used to prevent gas from flowing back into the
main supply line?
A. Pressure gauge
B. Gas meter
C. Check valve
D. Flow restrictor
A check valve allows gas flow in one direction only, preventing
backflow into the supply line.
12. Which type of gas detection system is required in commercial
kitchens?
A. Smoke detector
B. Fixed gas detector
C. Carbon monoxide detector only
D. Flame detector
Commercial kitchens require fixed gas detectors to alert personnel of
leaks promptly.
13. The proper action if a gas leak is detected inside a home is to:
A. Turn on lights to see the source
