Maine Gas Exam Questions With Verified
Answers.
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? -
answer12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - answer0.0508"
What is the maximum temp that a clay flue liner must be ab...
Minimum vertical height for a Type B-W gas vent above the bottom of a wall furnace? -
answer✔12 Feet
Minimum thickness of a steel striker barrier for gas tubing protection? - answer✔0.0508"
What is the maximum temp that a clay flue liner must be able to withstand without cracking? -
answer✔1,800 degrees F
Combustion air obtained from indoors on the same story shall have a minimum of... -
answer✔Two openings
When gas is being supplied by a manifold located in a remote area, what is the maximum
distance the shutoff valve at the manifold can be located from the appliance? - answer✔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
Maximum distance off the ceiling of the room shall an indoor combustion air opening be
installed? - answer✔12"
What is the minimum required clearance for an unlisted pool heater on all sides and rear? -
answer✔12"
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
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
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
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%
What is the minimum test pressure that can be used for testing newly installed gas piping? -
answer✔3 psig
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"
What is the maximum btu/hr input for an unlisted decorative appliance installed in a vented
fireplace with an 18 foot tall chimney and permanent free opening area of 29 in.²? -
answer✔50,400 BTU
All of the following piping materials are approved to be used for gas piping except... -
answer✔Cast Iron
What is the minimum size dimension of outdoor combustion air openings? - answer✔3"
What is the maximum operating pressure for a low pressure steam boiler? - answer✔15 psi
What is the maximum distance between horizontal supports for half inch OD copper tubing used
for gas supply piping? - answer✔4 feet
What type of valve shall be used at the point of connection when a gas system has supplementary
standby gas connected downstream of the meter? - answer✔Three-way valve
When an appliance is installed in an attic space, what maximum distance from the attic access
can the appliance be installed when measured along the centerline? - answer✔20 feet
What is the maximum BTU per hour input rating for a listed unvented wall-mounted room heater
equipped with an oxygen depletion safety shut off system being installed in a bedroom? -
answer✔10,000 BTU/hr
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