Master Gas Fitter Licensing Exam

Master Gas Fitter Licensing Exam Practice Test Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• A Master Gas Fitter is primarily responsible for which of the following?
• Installing only residential gas systems
• Supervising and ensuring code compliance of gas installations
• Writing gas utility policies
• Designing HVAC system ductwork

B Ensuring compliance and supervision of technicians is the key legal responsibility of a Master Gas Fitter.

• The maximum pressure allowed in a low-pressure natural gas

distribution system inside a building is typically: 1 / 3

• 2 psi
• 0.5 psi (14 inches WC)
• 5 psi
• 125 psi

Low-pressure systems are defined at 14" water column or lower.

• Which pipe material is approved for underground natural gas service

lines?

• Copper Type M
• Polyethylene (PE)
• PVC Schedule 40
• Galvanized steel

PE piping is standard for underground gas distribution due to corrosion resistance.

• What is the main reason drip legs are installed?
• To reduce noise
• To collect condensate and debris
• Increase pressure
• Provide pressure relief

Condensation and debris must be trapped before appliances.

• The primary combustion air source must provide at least how many

cubic feet per 1,000 BTU/hr of appliance input?

• 20 cu.ft
• 50 cu.ft 2 / 3

• 75 cu.ft
• 100 cu.ft

Standard rule: 50 cu.ft of air per 1,000 BTU/hr for proper combustion.

6. Excess flow valves are used to:

• Reduce gas odor
• Increase pressure for appliances
• Stop uncontrolled gas flow due to line break
• Control humidity

They protect against rupture-induced gas discharge.

7. An appliance regulator is required when inlet supply pressure exceeds:

• 7" WC
• 14" WC
• 1 psi
• 2 psi

Above low pressure requires a regulator to maintain safe appliance inlet pressure.

8. Purging a gas line should be done:

• Into a closed container
• To a safe outdoor location with ignition sources eliminated
• Into the sewer
• Inside mechanical room

Gas must be vented safely to atmosphere away from hazards.

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