MAINE GAS EXAM - WITH CODES
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT (GRADED A+)
According to NFPA 54 12.7.2(3), what is the minimum required vertical
clearance for a Type B-W gas vent measured from the bottom of a wall
furnace?
a. 8 feet
b. 10 feet
c. 12 feet ✔✔
d. 15 feet
Answer: c. 12 feet ✔✔
═════════════════════════════════════════════
Per NFPA 54 7.3.4, what is the minimum required thickness for a steel shield
plate (striker barrier) used to protect gas tubing from physical damage?
a. 0.0350"
b. 0.0508" ✔✔
c. 0.0625"
d. 0.1000"
Answer: b. 0.0508" ✔✔
═════════════════════════════════════════════
In accordance with NFPA 54 12.6.1.3, fireclay flue linings must be capable of
withstanding what maximum temperature without softening or cracking?
a. 1,000°F
b. 1,500°F
c. 1,800°F ✔✔
d. 2,000°F
Answer: c. 1,800°F ✔✔
═════════════════════════════════════════════
Under NFPA 54 9.3.2.3, what are the sizing and opening requirements when
providing indoor combustion air on the same story as the equipment?
a. One opening sized at 1 sq in per 500 Btu/hr
b. Two permanent openings, each sized at 1 sq in per 1,000 Btu/hr of total
appliance input rating ✔✔
c. Two openings, each sized at 1 sq in per 2,000 Btu/hr
d. One opening sized at 2 sq in per 1,000 Btu/hr
,Answer: b. Two permanent openings, each sized at 1 sq in per 1,000 Btu/hr of
total appliance input rating ✔✔
═════════════════════════════════════════════
According to NFPA 54 9.6.4.3, when gas piping is supplied through a remote
manifold, what is the maximum allowable distance between the manifold
shutoff valve and the equipment it serves?
a. 25 feet
b. 30 feet
c. 50 feet ✔✔
d. 100 feet
Answer: c. 50 feet ✔✔
What reference standard covers the storage of liquid propane gas? -ANSWER
✔✔NFPA 58
A service station is being built with one boiler 28 feet away from the meter that
uses natural gas; all other equipment is electric. What size K or L semi-rigid
copper tubing should be installed to supply 205 cu. ft. of gas per hour with an inlet
pressure less than 2 psi, pressure drop of 0.3 in. W.C. and a specific gravity of
0.60? -ANSWER ✔✔1 "
Maximum distance a gas shut-off valve can be installed from the equipment it
serves? -ANSWER ✔✔6 feet
NFPA 54 9.6.4.1
Maximum distance off the ceiling of the room shall an indoor combustion air
opening be installed? -ANSWER ✔✔12"
NFPA 54 9.3.2.3
What is the minimum required clearance for an unlisted pool heater on all sides
and rear? -ANSWER ✔✔12"
NFPA 54 10.21.2(3)
Flanges used for gas piping shall have gaskets made of an approved material
designed to withstand temperatures, pressure and chemical constituents of the gas.
Which of the following gasket materials is not acceptable? -ANSWER ✔✔Rubber
, NFPA 54 5.6.11
When corrosive or flammable fumes or gases are present near appliances, a safe
disposal method shall be provided. All of the following are considered flammable
or corrosive EXCEPT?! -ANSWER ✔✔Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what
shall the excavation be lined with? -ANSWER ✔✔Copper pan, concrete pit, or
other suitable material
NFPA 54 10.11.9
Which type of regulator is used in series with an another pressure regulator for the
purpose of automatically taking over in an emergency the control of the pressure
down stream in case the pressure tends to exceed a set maximum? -ANSWER
✔✔Monitoring
NFPA 54 3.3.88.4
When more than 2 90° elbow's are required in a vent connector, the maximum
capacity of the connector shall be reduced for each additional 90° elbow by? -
ANSWER ✔✔10%
NFPA 54 13.2.7
What is the minimum test pressure that can be used for testing newly installed gas
piping? -ANSWER ✔✔1 1/2 times the working pressure. Not less than 3 psi
NFPA 54 8.1.4.2
What is the minimum vertical distance to the bottom of a combustion air intake
located on the exterior of a building above adjacent finish ground level? -
ANSWER ✔✔12"
A residential boiler or furnace with a listed gas conversion burner and draft hood
with a type B gas vent shall have a minimum clearance from combustible materials
of? -ANSWER ✔✔6"
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT (GRADED A+)
According to NFPA 54 12.7.2(3), what is the minimum required vertical
clearance for a Type B-W gas vent measured from the bottom of a wall
furnace?
a. 8 feet
b. 10 feet
c. 12 feet ✔✔
d. 15 feet
Answer: c. 12 feet ✔✔
═════════════════════════════════════════════
Per NFPA 54 7.3.4, what is the minimum required thickness for a steel shield
plate (striker barrier) used to protect gas tubing from physical damage?
a. 0.0350"
b. 0.0508" ✔✔
c. 0.0625"
d. 0.1000"
Answer: b. 0.0508" ✔✔
═════════════════════════════════════════════
In accordance with NFPA 54 12.6.1.3, fireclay flue linings must be capable of
withstanding what maximum temperature without softening or cracking?
a. 1,000°F
b. 1,500°F
c. 1,800°F ✔✔
d. 2,000°F
Answer: c. 1,800°F ✔✔
═════════════════════════════════════════════
Under NFPA 54 9.3.2.3, what are the sizing and opening requirements when
providing indoor combustion air on the same story as the equipment?
a. One opening sized at 1 sq in per 500 Btu/hr
b. Two permanent openings, each sized at 1 sq in per 1,000 Btu/hr of total
appliance input rating ✔✔
c. Two openings, each sized at 1 sq in per 2,000 Btu/hr
d. One opening sized at 2 sq in per 1,000 Btu/hr
,Answer: b. Two permanent openings, each sized at 1 sq in per 1,000 Btu/hr of
total appliance input rating ✔✔
═════════════════════════════════════════════
According to NFPA 54 9.6.4.3, when gas piping is supplied through a remote
manifold, what is the maximum allowable distance between the manifold
shutoff valve and the equipment it serves?
a. 25 feet
b. 30 feet
c. 50 feet ✔✔
d. 100 feet
Answer: c. 50 feet ✔✔
What reference standard covers the storage of liquid propane gas? -ANSWER
✔✔NFPA 58
A service station is being built with one boiler 28 feet away from the meter that
uses natural gas; all other equipment is electric. What size K or L semi-rigid
copper tubing should be installed to supply 205 cu. ft. of gas per hour with an inlet
pressure less than 2 psi, pressure drop of 0.3 in. W.C. and a specific gravity of
0.60? -ANSWER ✔✔1 "
Maximum distance a gas shut-off valve can be installed from the equipment it
serves? -ANSWER ✔✔6 feet
NFPA 54 9.6.4.1
Maximum distance off the ceiling of the room shall an indoor combustion air
opening be installed? -ANSWER ✔✔12"
NFPA 54 9.3.2.3
What is the minimum required clearance for an unlisted pool heater on all sides
and rear? -ANSWER ✔✔12"
NFPA 54 10.21.2(3)
Flanges used for gas piping shall have gaskets made of an approved material
designed to withstand temperatures, pressure and chemical constituents of the gas.
Which of the following gasket materials is not acceptable? -ANSWER ✔✔Rubber
, NFPA 54 5.6.11
When corrosive or flammable fumes or gases are present near appliances, a safe
disposal method shall be provided. All of the following are considered flammable
or corrosive EXCEPT?! -ANSWER ✔✔Anhydrous Citric Acid
When a mechanical appliance is installed in an excavation deeper than 12", what
shall the excavation be lined with? -ANSWER ✔✔Copper pan, concrete pit, or
other suitable material
NFPA 54 10.11.9
Which type of regulator is used in series with an another pressure regulator for the
purpose of automatically taking over in an emergency the control of the pressure
down stream in case the pressure tends to exceed a set maximum? -ANSWER
✔✔Monitoring
NFPA 54 3.3.88.4
When more than 2 90° elbow's are required in a vent connector, the maximum
capacity of the connector shall be reduced for each additional 90° elbow by? -
ANSWER ✔✔10%
NFPA 54 13.2.7
What is the minimum test pressure that can be used for testing newly installed gas
piping? -ANSWER ✔✔1 1/2 times the working pressure. Not less than 3 psi
NFPA 54 8.1.4.2
What is the minimum vertical distance to the bottom of a combustion air intake
located on the exterior of a building above adjacent finish ground level? -
ANSWER ✔✔12"
A residential boiler or furnace with a listed gas conversion burner and draft hood
with a type B gas vent shall have a minimum clearance from combustible materials
of? -ANSWER ✔✔6"
