NYC Gas Work Qualification Exam – Fundamentals
Practice Questions WITH CORRECT ANSWERS
(VERIFED ANSWERS) PLUS RATIONALES 2026 Q&A
|INSTANT DOWNLOAD PDF
1. What is the main component of natural gas?
A. Propane
B. Butane
C. Methane
D. Ethane
Rationale: Natural gas is primarily composed of methane,
which makes up about 70–90% of the gas.
2. What is the purpose of a gas pressure regulator?
A. Increase gas flow
B. Heat gas
C. Reduce and control pressure
D. Detect leaks
Rationale: Regulators reduce high-pressure gas from pipelines
to a safe, usable pressure for appliances.
3. What color is typically used to identify natural gas
pipelines?
,A. Blue
B. Red
C. Yellow
D. Green
Rationale: Yellow is the standard color for gas pipeline
markings to indicate flammable gas.
4. What does an MSDS provide?
A. Weather forecasts
B. Hazard and safety information for chemicals
C. Legal contracts
D. Supply chain data
Rationale: Material Safety Data Sheets inform workers about
chemical hazards, handling, and first aid.
5. Why does natural gas rise quickly if leaked indoors?
A. Heavier than air
B. Lighter than air
C. Has a strong color
D. Has no odor
Rationale: Natural gas is lighter than air, so it tends to rise
toward ceilings and vents.
6. What additive gives natural gas its distinctive smell?
,A. Ammonia
B. Chlorine
C. Mercaptan
D. Formaldehyde
Rationale: Mercaptan is added to make gas detectable by smell
for safety.
7. What is the primary hazard of a gas leak?
A. Water contamination
B. Explosion or fire
C. Noise pollution
D. Soil erosion
Rationale: Escaping gas can ignite, causing explosions or fires.
8. What does a pressure relief valve do?
A. Increase temperature
B. Prevent overpressure
C. Add gas to the system
D. Measure flow
Rationale: Pressure relief valves release excess pressure to
prevent equipment failure or accidents.
9. Combustion requires fuel, oxygen, and what else?
, A. Light
B. Heat
C. Water
D. Pressure
Rationale: Heat completes the fire triangle to ignite fuel in the
presence of oxygen.
10. Which organization sets gas safety codes in the U.S.?
A. WHO
B. NFPA (National Fire Protection Association)
C. FIFA
D. FDA
Rationale: NFPA publishes codes like NFPA 54 for gas safety
standards.
11. What is the purpose of purging a gas line?
A. Add fuel
B. Remove air and contaminants
C. Lower pressure
D. Paint the pipe
Rationale: Purging prevents explosive air-gas mixtures in the
pipeline.
12. A pilot light is used to:
Practice Questions WITH CORRECT ANSWERS
(VERIFED ANSWERS) PLUS RATIONALES 2026 Q&A
|INSTANT DOWNLOAD PDF
1. What is the main component of natural gas?
A. Propane
B. Butane
C. Methane
D. Ethane
Rationale: Natural gas is primarily composed of methane,
which makes up about 70–90% of the gas.
2. What is the purpose of a gas pressure regulator?
A. Increase gas flow
B. Heat gas
C. Reduce and control pressure
D. Detect leaks
Rationale: Regulators reduce high-pressure gas from pipelines
to a safe, usable pressure for appliances.
3. What color is typically used to identify natural gas
pipelines?
,A. Blue
B. Red
C. Yellow
D. Green
Rationale: Yellow is the standard color for gas pipeline
markings to indicate flammable gas.
4. What does an MSDS provide?
A. Weather forecasts
B. Hazard and safety information for chemicals
C. Legal contracts
D. Supply chain data
Rationale: Material Safety Data Sheets inform workers about
chemical hazards, handling, and first aid.
5. Why does natural gas rise quickly if leaked indoors?
A. Heavier than air
B. Lighter than air
C. Has a strong color
D. Has no odor
Rationale: Natural gas is lighter than air, so it tends to rise
toward ceilings and vents.
6. What additive gives natural gas its distinctive smell?
,A. Ammonia
B. Chlorine
C. Mercaptan
D. Formaldehyde
Rationale: Mercaptan is added to make gas detectable by smell
for safety.
7. What is the primary hazard of a gas leak?
A. Water contamination
B. Explosion or fire
C. Noise pollution
D. Soil erosion
Rationale: Escaping gas can ignite, causing explosions or fires.
8. What does a pressure relief valve do?
A. Increase temperature
B. Prevent overpressure
C. Add gas to the system
D. Measure flow
Rationale: Pressure relief valves release excess pressure to
prevent equipment failure or accidents.
9. Combustion requires fuel, oxygen, and what else?
, A. Light
B. Heat
C. Water
D. Pressure
Rationale: Heat completes the fire triangle to ignite fuel in the
presence of oxygen.
10. Which organization sets gas safety codes in the U.S.?
A. WHO
B. NFPA (National Fire Protection Association)
C. FIFA
D. FDA
Rationale: NFPA publishes codes like NFPA 54 for gas safety
standards.
11. What is the purpose of purging a gas line?
A. Add fuel
B. Remove air and contaminants
C. Lower pressure
D. Paint the pipe
Rationale: Purging prevents explosive air-gas mixtures in the
pipeline.
12. A pilot light is used to:
