License Exam Practice Questions And

Natural Gas Distribution Technician License Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Q1.Which component is typically used to reduce high-pressure gas to a usable distribution pressure?

• Odorizer
• Compressor
• Regulator
• Flow meter

Rationale: Regulators lower high inlet pressures to safe, controlled outlet

pressures for distribution.

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Q2.

The odorant most commonly added to natural gas for leak detection is:

• Benzene
• Mercaptan
• Methanol
• Sulfur dioxide

Rationale: Mercaptan provides the characteristic rotten-egg smell used for

leak detection.

Q3.What is the primary purpose of a gas shutoff valve?

• Increase flow
• Modify odorant levels
• Stop gas flow during emergencies or maintenance
• Filter particulates

Rationale: Shutoff valves isolate sections of the pipeline for safety.

Q4.Which type of pipe is most commonly used for modern gas distribution mains?

• Steel
• Copper 2 / 4

• Cast iron
• Polyethylene (PE)

Rationale: PE pipe is corrosion-resistant, flexible, and preferred for new

distribution installations.

Q5.What tool is used to detect underground gas leaks?

• Thermometer
• Combustible gas indicator (CGI)
• Infrared thermometer
• Ultrasonic tester

Rationale: CGIs measure combustible gas concentration in the air or soil.

Q6.Which pressure range is typical for residential natural gas delivery?

• 200–300 psi
• 10–20 psi
• 0.25–5 psi
• 50–100 psi

Rationale: Residential service operates at low pressure for safety and

appliance compatibility.

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Q7.

A service line connects the distribution main to the:

• Compressor station
• Transmission pipeline
• Customer meter
• Odorizer unit

Rationale: Service lines deliver gas from mains to customer meters.

Q8.Which method is commonly used to join modern polyethylene gas piping?

• Threading
• Brazing
• Heat fusion
• Riveting

Rationale: Heat fusion creates leak-free, permanent molecular bonds

between PE pipe sections.

Q9.What is the lower explosive limit (LEL) of natural gas?

• 1%
• 5%
• 10%
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