NC Fuel Gas Code Study Questions
A gas heating unit has a 60,000 2. 15 sq in (G 304.6.1 60,,000 = 15)
BTU/hr input rating. What is the
minimum vertical duct size when
2 openings to the outside are
used for combustion and
ventilation if the unit is in space
with less than 50 Cu.Ft. per 1000
BTU of the appliance input rating?
1. 12 sq in
2. 15 sq in
3. 19 sq in
4. 100 sq in
Brazing alloys used in gas piping 1. .05% (G 403.10.(1&2))
systems shall not contain
more than_____________%
phosphorus.
1. .05
2. .5
3. 1
4. 2
Gas pipe shall be clear and 4. All the Above (G 403.7)
free from cutting bars and
defeats in structure or threading
and shall be:
1. Thoroughly Brushed
2. Chip Blown
3. Scale Blown
4. All the Above
,The minimum dimension of 3. 3 (G 304.5.3.1)
rectangular air openings used for
combustion air shall not be less
than________inches.
1. 1
2. 2
3. 3
4. 4
How many threads will be cut on a 3. 12 (G Table 403.9.2)
3" gas pipe?
1. 10
2. 11
3. 12
4. 13
Where appliances are installed 1. 1-100 (G 304.5.3.1)
in space with less than 50 Cu.Ft.
per 1000 Btu of the appliance
input rating, the space may be
made unconfined by 2 permanent
openings freely communicating
with additional rooms of sufficient
volume. The 2 permanent
openings shall have free area
of not less than sq.in. per
1000 BTU input but not
less than__sq. in.
1. 1-100
2. 2-200
3. 2-250
4. 3-400
The diameter of the holes in joists 3. 1/3 (G 302.3.2)
bored for pipes shall not
exceed_____________of the
depth of
the joist.
1. 1/8
2. 1/4
3. 1/3
4. 1/2
A 30,000 btu/h direct vent 3. 9 (G 503.8(3))
appliances shall not terminate less
than________________inches from
any
opening to a building.
1. 3
2. 6
3. 9
4. 1
Gas appliances installed in 3. 18 (G 305.3)
, residential garages shall be
installed such that the burner
and ignition devices are located
not less than inches above
the floor.
1. 6
2. 12
3. 18
4. 24
A gas heating unit has a 60,000 2. 15 sq in (G 304.6.1 60,,000 = 15)
BTU/hr input rating. What is the
minimum vertical duct size when
2 openings to the outside are
used for combustion and
ventilation if the unit is in space
with less than 50 Cu.Ft. per 1000
BTU of the appliance input rating?
1. 12 sq in
2. 15 sq in
3. 19 sq in
4. 100 sq in
Brazing alloys used in gas piping 1. .05% (G 403.10.(1&2))
systems shall not contain
more than_____________%
phosphorus.
1. .05
2. .5
3. 1
4. 2
Gas pipe shall be clear and 4. All the Above (G 403.7)
free from cutting bars and
defeats in structure or threading
and shall be:
1. Thoroughly Brushed
2. Chip Blown
3. Scale Blown
4. All the Above
,The minimum dimension of 3. 3 (G 304.5.3.1)
rectangular air openings used for
combustion air shall not be less
than________inches.
1. 1
2. 2
3. 3
4. 4
How many threads will be cut on a 3. 12 (G Table 403.9.2)
3" gas pipe?
1. 10
2. 11
3. 12
4. 13
Where appliances are installed 1. 1-100 (G 304.5.3.1)
in space with less than 50 Cu.Ft.
per 1000 Btu of the appliance
input rating, the space may be
made unconfined by 2 permanent
openings freely communicating
with additional rooms of sufficient
volume. The 2 permanent
openings shall have free area
of not less than sq.in. per
1000 BTU input but not
less than__sq. in.
1. 1-100
2. 2-200
3. 2-250
4. 3-400
The diameter of the holes in joists 3. 1/3 (G 302.3.2)
bored for pipes shall not
exceed_____________of the
depth of
the joist.
1. 1/8
2. 1/4
3. 1/3
4. 1/2
A 30,000 btu/h direct vent 3. 9 (G 503.8(3))
appliances shall not terminate less
than________________inches from
any
opening to a building.
1. 3
2. 6
3. 9
4. 1
Gas appliances installed in 3. 18 (G 305.3)
, residential garages shall be
installed such that the burner
and ignition devices are located
not less than inches above
the floor.
1. 6
2. 12
3. 18
4. 24
