CO GAS LINE UTILITY CONTRACTOR EXAM
QUESTIONS AND CORRECT NSWERS (VERIFIED
ANSWERS) Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas distribution system?
A. To transport potable water
B. To transport natural gas safely from supply points to
consumers
C. To distribute electricity
D. To remove wastewater
Correct Answer: B. To transport natural gas safely from supply
points to consumers
Rationale: Gas distribution systems are designed to transport
natural gas safely and reliably to residential, commercial, and
industrial users.
2. Which property of natural gas makes odorization
important?
A. It is naturally blue
B. It is naturally odorless
C. It is highly visible
D. It freezes easily
Correct Answer: B. It is naturally odorless
,Rationale: Natural gas is normally odorless, so an odorant is
added to help people detect leaks.
3. What odorant is commonly added to natural gas?
A. Methane
B. Nitrogen
C. Mercaptan
D. Oxygen
Correct Answer: C. Mercaptan
Rationale: Mercaptans are commonly used because they
produce a distinctive odor that can indicate the presence of
gas.
4. What is the most important consideration when excavating
near an existing gas line?
A. Soil color
B. Utility location and safe excavation practices
C. Pipe paint color
D. Weather temperature only
Correct Answer: B. Utility location and safe excavation practices
Rationale: Locating existing utilities before excavation helps
prevent damage, fires, explosions, and service interruptions.
,5. What does a utility locate service identify?
A. Only property boundaries
B. Underground utility facilities
C. Building occupancy
D. Gas consumption
Correct Answer: B. Underground utility facilities
Rationale: Utility locating helps identify underground facilities
before excavation begins.
6. Which gas is the principal component of most natural gas?
A. Oxygen
B. Methane
C. Carbon monoxide
D. Hydrogen
Correct Answer: B. Methane
Rationale: Methane generally makes up the largest portion of
natural gas.
7. What is the primary hazard associated with an uncontrolled
natural-gas release?
A. Rust formation only
B. Fire or explosion
C. Freezing water
D. Electrical overload only
, Correct Answer: B. Fire or explosion
Rationale: Gas can accumulate and form a combustible mixture
with air, creating a serious fire or explosion hazard.
8. What should be done first if a worker discovers a suspected
major gas leak?
A. Create a spark to locate the leak
B. Ignore it
C. Follow emergency procedures and move people away from
the hazard
D. Cover the pipe with soil immediately
Correct Answer: C. Follow emergency procedures and move
people away from the hazard
Rationale: Personnel safety and controlling ignition sources are
immediate priorities during a gas emergency.
9. Why must ignition sources be controlled around escaping
gas?
A. Gas reduces humidity
B. Gas can ignite when mixed with air
C. Gas makes metal brittle
D. Gas eliminates oxygen
Correct Answer: B. Gas can ignite when mixed with air
QUESTIONS AND CORRECT NSWERS (VERIFIED
ANSWERS) Q&A 2027 |INSTANT DOWNLOAD PDF
1. What is the primary purpose of a gas distribution system?
A. To transport potable water
B. To transport natural gas safely from supply points to
consumers
C. To distribute electricity
D. To remove wastewater
Correct Answer: B. To transport natural gas safely from supply
points to consumers
Rationale: Gas distribution systems are designed to transport
natural gas safely and reliably to residential, commercial, and
industrial users.
2. Which property of natural gas makes odorization
important?
A. It is naturally blue
B. It is naturally odorless
C. It is highly visible
D. It freezes easily
Correct Answer: B. It is naturally odorless
,Rationale: Natural gas is normally odorless, so an odorant is
added to help people detect leaks.
3. What odorant is commonly added to natural gas?
A. Methane
B. Nitrogen
C. Mercaptan
D. Oxygen
Correct Answer: C. Mercaptan
Rationale: Mercaptans are commonly used because they
produce a distinctive odor that can indicate the presence of
gas.
4. What is the most important consideration when excavating
near an existing gas line?
A. Soil color
B. Utility location and safe excavation practices
C. Pipe paint color
D. Weather temperature only
Correct Answer: B. Utility location and safe excavation practices
Rationale: Locating existing utilities before excavation helps
prevent damage, fires, explosions, and service interruptions.
,5. What does a utility locate service identify?
A. Only property boundaries
B. Underground utility facilities
C. Building occupancy
D. Gas consumption
Correct Answer: B. Underground utility facilities
Rationale: Utility locating helps identify underground facilities
before excavation begins.
6. Which gas is the principal component of most natural gas?
A. Oxygen
B. Methane
C. Carbon monoxide
D. Hydrogen
Correct Answer: B. Methane
Rationale: Methane generally makes up the largest portion of
natural gas.
7. What is the primary hazard associated with an uncontrolled
natural-gas release?
A. Rust formation only
B. Fire or explosion
C. Freezing water
D. Electrical overload only
, Correct Answer: B. Fire or explosion
Rationale: Gas can accumulate and form a combustible mixture
with air, creating a serious fire or explosion hazard.
8. What should be done first if a worker discovers a suspected
major gas leak?
A. Create a spark to locate the leak
B. Ignore it
C. Follow emergency procedures and move people away from
the hazard
D. Cover the pipe with soil immediately
Correct Answer: C. Follow emergency procedures and move
people away from the hazard
Rationale: Personnel safety and controlling ignition sources are
immediate priorities during a gas emergency.
9. Why must ignition sources be controlled around escaping
gas?
A. Gas reduces humidity
B. Gas can ignite when mixed with air
C. Gas makes metal brittle
D. Gas eliminates oxygen
Correct Answer: B. Gas can ignite when mixed with air
