National Fuel Gas Code Exam Real
Exam Questions With All Correct
Answers 2025 New Update A+ Pass
The maximum operating pressure shall be ________ psi. - Answers - ✔✔125
The term "shall" indicates what? - Answers - ✔✔mandatory requirement
Define a Category I Vented Appliance. - Answers - ✔✔nonpositive vent, non
condensate
Define a Category II Vented Appliance. - Answers - ✔✔nonpositive vent, condensate
Define a Category III Vented Appliance. - Answers - ✔✔positive vent, non condensate
Define a Category IV Vented Appliance. - Answers - ✔✔positive vent, condensate
Define a Low Pressure Boiler. - Answers - ✔✔Generates steam not in excess of 15 psi,
with a maximum temperate of 250 degrees.
Define British Thermal Unit (Btu) - Answers - ✔✔the quantity of heat required to raise
the temperature of 1 pound of water 1 degree (1055 joules)
Define a Burner. - Answers - ✔✔A device for the final conveyance of gas, or a mixture
of gas and air, to the combustion zone.
Define a Type 1 and 2 Clothes Dryer. - Answers - ✔✔Family, Public
Define Condensate (Condensation) - Answers - ✔✔Liquid that separates from a gas
due to a reduction in temperature or an increase in pressure
Define a Cubic Foot of Gas. - Answers - ✔✔The amount of gas that occupies 1 ft cubed
at 60 degrees.
Define Draft - Answers - ✔✔A pressure difference that causes gas or air to flow through
a chimney, vent, flue or appliance
Define a Mechanical Draft - Answers - ✔✔Draft produced by a fan or an air of steam jet
Define a Natural Draft - Answers - ✔✔Draft produced by the difference in the weight of
a column of flue gases within a chimney or vent
, Define a Draft Hood - Answers - ✔✔A nonadjustable device built into an appliance or
made a part of the vent connector from an appliance
Define a Flue Collar - Answers - ✔✔The portion of an appliance designed for the
attachment of a draft hood, vent connector or venting system.
Define a Pressure Relief Valve - Answers - ✔✔A valve that automatically opens and
closes a relief vent, depending on whether the pressure is above or below a
predetermined value.
Define a Vacuum Relief Valve - Answers - ✔✔A valve that automatically opens and
closes a vent for relieving a vacuum within the hot water supply system, depending on
whether the vacuum is above or below a predetermined value.
Define a Common Vent - Answers - ✔✔That portion of a vent or chimney system that
conveys products of combustion from more than one appliance
Define a Gas Vent - Answers - ✔✔Designed for conveying vent gases from appliances
or their vent connectors to the outdoors
Define a Vent Connector - Answers - ✔✔The pipe or duct that connects a fuel gas
burning appliance to a vent or chimney
When adding appliances to a gas system, the existing piping shall be checked to
determine whether it has _____________ _______________. - Answers - ✔✔Adequate
capacity
LP Gas Systems are designed to operate below __________ degrees? - Answers -
✔✔-5 F (-21 C)
Copper and Brass shall not be used if the gas contains more than an average of
_________ grains of hydrogen sulfide per _________ scf of gas. - Answers - ✔✔0.3,
100
List four types of pipe joints. - Answers - ✔✔threaded, flanged, brazed or welded
Where _________ psi steel flanges are bolted to Class 125 cast iron flanges, the raised
face on the steel flange shall be ________________. - Answers - ✔✔150, removed
Gas meters shall not be placed anywhere where they will be subject to excessive
corrosion or vibration. List three prohibited locations. - Answers - ✔✔Adjacent to
driveways, public passages, under fire escape
Exam Questions With All Correct
Answers 2025 New Update A+ Pass
The maximum operating pressure shall be ________ psi. - Answers - ✔✔125
The term "shall" indicates what? - Answers - ✔✔mandatory requirement
Define a Category I Vented Appliance. - Answers - ✔✔nonpositive vent, non
condensate
Define a Category II Vented Appliance. - Answers - ✔✔nonpositive vent, condensate
Define a Category III Vented Appliance. - Answers - ✔✔positive vent, non condensate
Define a Category IV Vented Appliance. - Answers - ✔✔positive vent, condensate
Define a Low Pressure Boiler. - Answers - ✔✔Generates steam not in excess of 15 psi,
with a maximum temperate of 250 degrees.
Define British Thermal Unit (Btu) - Answers - ✔✔the quantity of heat required to raise
the temperature of 1 pound of water 1 degree (1055 joules)
Define a Burner. - Answers - ✔✔A device for the final conveyance of gas, or a mixture
of gas and air, to the combustion zone.
Define a Type 1 and 2 Clothes Dryer. - Answers - ✔✔Family, Public
Define Condensate (Condensation) - Answers - ✔✔Liquid that separates from a gas
due to a reduction in temperature or an increase in pressure
Define a Cubic Foot of Gas. - Answers - ✔✔The amount of gas that occupies 1 ft cubed
at 60 degrees.
Define Draft - Answers - ✔✔A pressure difference that causes gas or air to flow through
a chimney, vent, flue or appliance
Define a Mechanical Draft - Answers - ✔✔Draft produced by a fan or an air of steam jet
Define a Natural Draft - Answers - ✔✔Draft produced by the difference in the weight of
a column of flue gases within a chimney or vent
, Define a Draft Hood - Answers - ✔✔A nonadjustable device built into an appliance or
made a part of the vent connector from an appliance
Define a Flue Collar - Answers - ✔✔The portion of an appliance designed for the
attachment of a draft hood, vent connector or venting system.
Define a Pressure Relief Valve - Answers - ✔✔A valve that automatically opens and
closes a relief vent, depending on whether the pressure is above or below a
predetermined value.
Define a Vacuum Relief Valve - Answers - ✔✔A valve that automatically opens and
closes a vent for relieving a vacuum within the hot water supply system, depending on
whether the vacuum is above or below a predetermined value.
Define a Common Vent - Answers - ✔✔That portion of a vent or chimney system that
conveys products of combustion from more than one appliance
Define a Gas Vent - Answers - ✔✔Designed for conveying vent gases from appliances
or their vent connectors to the outdoors
Define a Vent Connector - Answers - ✔✔The pipe or duct that connects a fuel gas
burning appliance to a vent or chimney
When adding appliances to a gas system, the existing piping shall be checked to
determine whether it has _____________ _______________. - Answers - ✔✔Adequate
capacity
LP Gas Systems are designed to operate below __________ degrees? - Answers -
✔✔-5 F (-21 C)
Copper and Brass shall not be used if the gas contains more than an average of
_________ grains of hydrogen sulfide per _________ scf of gas. - Answers - ✔✔0.3,
100
List four types of pipe joints. - Answers - ✔✔threaded, flanged, brazed or welded
Where _________ psi steel flanges are bolted to Class 125 cast iron flanges, the raised
face on the steel flange shall be ________________. - Answers - ✔✔150, removed
Gas meters shall not be placed anywhere where they will be subject to excessive
corrosion or vibration. List three prohibited locations. - Answers - ✔✔Adjacent to
driveways, public passages, under fire escape
