Maine Gas Exam (Latest Update 2026 /
2027) 100% Correct Questions & Answer
When an unlisted outdoor open flame decorative appliance is installed, what is the
Minimum required clearance on all sides of this appliance from combustible materials?
- Correct answer 36"
What is the maximum hanger support spacing for horizontal 1" O.D. smooth wall
tubing? - Correct answer 8 feet
A 10" natural gas main pipe is installed to supply a power plant; however, the pipe has
a bad valve that must be replaced. How much of the 10" must be purged with inert gas
before work can begin? - Correct answer Any Length
The NFPA 54 National Fuel Gas Code regulates gas piping systems that have a
MAXIMUM operating pressure of... - Correct answer 125 psig.
What MAXIMUM distance can an electrical disconnect switch be located from the air-
conditioning unit it serves? - Correct answer 50 feet
,A 520 foot long gas line is being installed in semi-rigid Type K copper tubing. The
system is natural gas less than 2 psi, with a 0.3 in. w.c. pressure drop and a specific
gravity of 0.60. The appliance requires 135 cubic feet of gas. What size tubing should be
installed? - Correct answer 1-1/2"
What MINIMUM distance above grade shall the bottom of a horizontal mechanical draft
exhaust terminate? - Correct answer 1 foot
PVC plastic pipe used for connecting gas pressure regulator vents to remote vent
terminations shall conform with what ANSI standard? - Correct answer ANSI/UL 651
What is the MINIMUM termination height of a single-wall metal pipe vent above the
highest point where it passes through a roof? - Correct answer 2 feet
An unlisted floor furnace shall have a temperature limit control that will shut off gas
supply if the air temperature at the air outlet register exceeds... - Correct answer 350
degrees F above room temperature
, An unlisted clothes dryer shall have what MINIMUM clearance from the exhaust duct
to combustible materials? - Correct answer 18"
Listed unit heaters that are suspended from the ceiling shall maintain what MINIMUM
amount of clearance from the top of the unit heater to combustible materials? -
Correct answer 6"
Fuel cell power plants that have an output greater than 50 kW shall be installed in
accordance with what NFPA Standard? - Correct answer NFPA 853
Given: A very large house is being built. The home has two 65,000 BTU furnaces, three
55,000 BTU direct vent fireplaces and one 70,000 BTU range. The farthest connection
from the meter is 67 feet away. The home is supplied with natural gas with a specific
gravity of 0.60, inlet pressure 2.0 psi and a pressure drop of 1.0 in. w.c. in semi-rigid
ACR copper tubing.
What size L copper gas tube will be required leaving the meter? - Correct answer 1-
1/4"
2027) 100% Correct Questions & Answer
When an unlisted outdoor open flame decorative appliance is installed, what is the
Minimum required clearance on all sides of this appliance from combustible materials?
- Correct answer 36"
What is the maximum hanger support spacing for horizontal 1" O.D. smooth wall
tubing? - Correct answer 8 feet
A 10" natural gas main pipe is installed to supply a power plant; however, the pipe has
a bad valve that must be replaced. How much of the 10" must be purged with inert gas
before work can begin? - Correct answer Any Length
The NFPA 54 National Fuel Gas Code regulates gas piping systems that have a
MAXIMUM operating pressure of... - Correct answer 125 psig.
What MAXIMUM distance can an electrical disconnect switch be located from the air-
conditioning unit it serves? - Correct answer 50 feet
,A 520 foot long gas line is being installed in semi-rigid Type K copper tubing. The
system is natural gas less than 2 psi, with a 0.3 in. w.c. pressure drop and a specific
gravity of 0.60. The appliance requires 135 cubic feet of gas. What size tubing should be
installed? - Correct answer 1-1/2"
What MINIMUM distance above grade shall the bottom of a horizontal mechanical draft
exhaust terminate? - Correct answer 1 foot
PVC plastic pipe used for connecting gas pressure regulator vents to remote vent
terminations shall conform with what ANSI standard? - Correct answer ANSI/UL 651
What is the MINIMUM termination height of a single-wall metal pipe vent above the
highest point where it passes through a roof? - Correct answer 2 feet
An unlisted floor furnace shall have a temperature limit control that will shut off gas
supply if the air temperature at the air outlet register exceeds... - Correct answer 350
degrees F above room temperature
, An unlisted clothes dryer shall have what MINIMUM clearance from the exhaust duct
to combustible materials? - Correct answer 18"
Listed unit heaters that are suspended from the ceiling shall maintain what MINIMUM
amount of clearance from the top of the unit heater to combustible materials? -
Correct answer 6"
Fuel cell power plants that have an output greater than 50 kW shall be installed in
accordance with what NFPA Standard? - Correct answer NFPA 853
Given: A very large house is being built. The home has two 65,000 BTU furnaces, three
55,000 BTU direct vent fireplaces and one 70,000 BTU range. The farthest connection
from the meter is 67 feet away. The home is supplied with natural gas with a specific
gravity of 0.60, inlet pressure 2.0 psi and a pressure drop of 1.0 in. w.c. in semi-rigid
ACR copper tubing.
What size L copper gas tube will be required leaving the meter? - Correct answer 1-
1/4"
