Exam Practice Questions And Correct

Ohio Natural Gas Pipeline Operator Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the primary purpose of a natural gas pipeline system?
• Transport crude oil
• Transport natural gas from production fields to consumers
• Store natural gas underground
• Generate electricity

Rationale: The pipeline system’s main function is to safely transport

natural gas from wells to end users such as utilities or industries.

• Which agency regulates interstate natural gas pipelines in the U.S.?

A. OSHA

B. FERC

C. EPA 1 / 4

D. DOT

Rationale: The Federal Energy Regulatory Commission (FERC)

oversees interstate natural gas pipeline operations and rates.

3. The typical pressure range for transmission pipelines is:

• 50–150 psi
• 150–300 psi
• 300–600 psi
• 200–1500 psi

Rationale: Transmission lines operate at high pressures, typically

between 200 and 1500 psi for long-distance transport.

• What is the main function of a compressor station?
• Reduce gas flow
• Increase gas pressure to maintain flow
• Measure gas impurities
• Store gas temporarily

Rationale: Compressor stations boost pressure to keep gas moving

through the pipeline.

• What material is most commonly used for high-pressure natural gas

pipelines?

A. PVC

• Cast iron
• Steel
• Aluminum 2 / 4

Rationale: Steel provides the necessary strength and durability for

high-pressure natural gas transmission lines.

• Which of the following is an odorant added to natural gas for leak

detection?

• Chlorine
• Propane
• Mercaptan
• Methane

Rationale: Mercaptan gives natural gas its distinctive rotten egg

smell to detect leaks.

• What does the term "MAOP" stand for?
• Maximum Authorized Operation Plan
• Maximum Allowable Operating Pressure
• Minimum Air Output Pressure
• Mean Average Operation Pressure

Rationale: MAOP refers to the highest pressure at which a pipeline

can safely operate.

• Which test is used to verify pipeline strength before operation?
• Radiographic test
• Hydrostatic test
• Magnetic test
• Ultrasonic test 3 / 4

Rationale: Hydrostatic testing uses pressurized water to confirm

pipeline integrity and strength.

• What component controls gas flow in a pipeline system?
• Regulator
• Valve
• Coupler
• Gasket

Rationale: Valves are used to start, stop, or control gas flow within

the pipeline network.

• What is the main cause of corrosion in buried steel pipelines?
• Air exposure
• Electrochemical reactions with soil moisture
• Internal pressure
• Gas impurities

Rationale: Corrosion occurs when metal interacts with electrolytes in

moist soil through electrochemical processes.

11. Cathodic protection is used to:

• Detect leaks
• Strengthen welds
• Prevent corrosion
• Reduce pressure

Rationale: Cathodic protection applies electrical current to prevent

corrosion on buried steel pipelines.

• / 4