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Master Gas Fitter Licensing Exam Practice Test Questions And ( 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
- The maximum pressure allowed in a low-pressure natural gas
B Ensuring compliance and supervision of technicians is the key legal responsibility of a Master Gas Fitter.
distribution system inside a building is typically: 1 / 3
- 2 psi
- 0.5 psi (14 inches WC)
- 5 psi
- 125 psi
- Which pipe material is approved for underground natural gas service
- Copper Type M
- Polyethylene (PE)
- PVC Schedule 40
- Galvanized steel
- What is the main reason drip legs are installed?
- To reduce noise
- To collect condensate and debris
- Increase pressure
- Provide pressure relief
- The primary combustion air source must provide at least how many
- 20 cu.ft
- 50 cu.ft 2 / 3
Low-pressure systems are defined at 14" water column or lower.
lines?
PE piping is standard for underground gas distribution due to corrosion resistance.
Condensation and debris must be trapped before appliances.
cubic feet per 1,000 BTU/hr of appliance input?
- 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
- / 3
Gas must be vented safely to atmosphere away from hazards.
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