NATIONAL FUEL GAS CODE EXAM
COMPREHENSIVE TEST PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
EXPERT VERIFIED GRADED A+
◉ The ___ of natural gas can only be reached at perfect combustion.
Answer: Maximum flame temperature
◉ According to the ___ law of thermodynamics, the heat energy in a
flame will flow to the lower temperature of the air or water
contained in a gas appliance, which, in turn, will flow on to lower-
temperature areas. Answer: Second
◉ A(n) ___ burner is a mechanical-draft burner that utilizes a
motorized fan at the outlet of the combustion chamber to draw air
into the chamber. Answer: Induced-draft
◉ A(n) ___ burner is an atmospheric burner that utilizes a chimney
or vent stack to pull in secondary air and remove the products of
combustion. Answer: Natural draft
◉ A safety feature of a(n) ___ pilot is the ability of the pilot to burn
fuel in the combustion chamber if there is a leak at the burner.
Answer: Continuous
, ◉ An atmospheric burner is adjusted properly when the height of
the inner cone is approximately ___% of the maximum visible cone
height. Answer: 70
◉ The gas pressure range classified as high pressure is from ___ psi.
Answer: 2 to 50
◉ The building fuel gas distribution system is regulated by NFPA 54
National Fuel Gas Code, which also is referenced by other national
codes, NFPA 58 Liquefied Petroleum Gas Code, and by CSA B149.1
National Gas and Propane Installation Code in Canada. Answer: True
◉ Piping materials must have stamps or markings affixed to them by
certified manufacturers to indicate the products have been
manufactured according to a particular standard. Answer: True
◉ System designers select piping materials used to convey fuel gas
based on temperature, pressure, and application parameters.
Answer: True
◉ The schedule number determines the outside diameter of a pipe.
Answer: False (NPS is based on pipe diameter and SCH is based on
wall thickness)
COMPREHENSIVE TEST PAPER 2026
COMPLETE QUESTIONS AND ANSWERS
EXPERT VERIFIED GRADED A+
◉ The ___ of natural gas can only be reached at perfect combustion.
Answer: Maximum flame temperature
◉ According to the ___ law of thermodynamics, the heat energy in a
flame will flow to the lower temperature of the air or water
contained in a gas appliance, which, in turn, will flow on to lower-
temperature areas. Answer: Second
◉ A(n) ___ burner is a mechanical-draft burner that utilizes a
motorized fan at the outlet of the combustion chamber to draw air
into the chamber. Answer: Induced-draft
◉ A(n) ___ burner is an atmospheric burner that utilizes a chimney
or vent stack to pull in secondary air and remove the products of
combustion. Answer: Natural draft
◉ A safety feature of a(n) ___ pilot is the ability of the pilot to burn
fuel in the combustion chamber if there is a leak at the burner.
Answer: Continuous
, ◉ An atmospheric burner is adjusted properly when the height of
the inner cone is approximately ___% of the maximum visible cone
height. Answer: 70
◉ The gas pressure range classified as high pressure is from ___ psi.
Answer: 2 to 50
◉ The building fuel gas distribution system is regulated by NFPA 54
National Fuel Gas Code, which also is referenced by other national
codes, NFPA 58 Liquefied Petroleum Gas Code, and by CSA B149.1
National Gas and Propane Installation Code in Canada. Answer: True
◉ Piping materials must have stamps or markings affixed to them by
certified manufacturers to indicate the products have been
manufactured according to a particular standard. Answer: True
◉ System designers select piping materials used to convey fuel gas
based on temperature, pressure, and application parameters.
Answer: True
◉ The schedule number determines the outside diameter of a pipe.
Answer: False (NPS is based on pipe diameter and SCH is based on
wall thickness)
