NM JOURNEYMAN NATURAL GAS
FITTER EXAM 150 HIGH YIELD
TECHNICAL SCENARIOS FEATURING
DETAILED CORRECT ANSWERS WITH
RATIONALES AND CORRECT
VERIFIED ANSWERS INSTANT
DOWNLOAD GRADE A+
New Mexico Journeyman Natural Gas Fitter Practice
Exam
1. Which code is the primary standard adopted by New
Mexico for the installation of fuel gas piping systems
and appliances? A. International Mechanical Code (IMC) B.
NFPA 54 / ANSI Z223.1 (National Fuel Gas Code) C. Uniform
Plumbing Code (UPC) D. NFPA 58 (Liquefied Petroleum Gas
Code) Correct Answer: B NFPA 54 (National Fuel Gas
Code) is the primary standard adopted by the New Mexico
Construction Industries Division (CID) for the design,
installation, and inspection of natural gas and propane piping
systems and appliances.
2. According to the code, a room is considered a
"confined space" for combustion air purposes if its
volume is less than how many cubic feet per 1,000
Btu/hr of the total input rating of all appliances in the
space? A. 25 cubic feet B. 50 cubic feet C. 100 cubic feet D. 200
cubic feet Correct Answer: B A confined space is defined as
a space whose volume is less than 50 cubic feet per 1,000
Btu/hr of the aggregate input rating of all appliances installed
,in that space. Such spaces require specific methods for
providing combustion and ventilation air.
3. Where must a sediment trap (drip leg) be installed
on a gas appliance? A. Upstream of the manual shutoff valve
B. Downstream of the appliance shutoff valve, as close to the
inlet of the appliance as practical C. At the lowest point of the
main building supply line only D. Inside the gas meter regulator
Correct Answer: B A sediment trap must be installed
downstream of the appliance shutoff valve and as close to the
inlet of the appliance as practical to catch debris, moisture, or
pipe scale before it can enter the appliance controls.
4. When pressure testing a new gas piping system
operating at 14 inches water column (w.c.) or less,
what is the minimum test pressure and duration
required by NFPA 54? A. 3 psig for a minimum of 15
minutes B. 10 psig for a minimum of 1 hour C. 1.5 times the
operating pressure for 10 minutes D. 60 psig for a minimum of
2 hours Correct Answer: A For systems operating at 14
inches w.c. or less, the code requires a test pressure of at least
3 psig (or 1.5 times the operating pressure, whichever is
greater) sustained for a minimum of 15 minutes without a
drop in pressure.
5. When using the "Two Permanent Openings" method
to provide combustion air from indoors, what is the
minimum free area required for each opening? A. 1
square inch per 1,000 Btu/hr of total appliance input B. 1
square inch per 2,000 Btu/hr of total appliance input C. 1
square inch per 3,000 Btu/hr of total appliance input D. 1
square inch per 4,000 Btu/hr of total appliance input Correct
Answer: A When using two permanent openings (one within
12 inches of the ceiling and one within 12 inches of the floor) to
connect to another indoor space, each opening must have a
,minimum free area of 1 square inch per 1,000 Btu/hr of the
total input rating of all appliances.
6. In New Mexico, many installations occur at
elevations above 2,000 feet. How does high altitude
affect the installation of gas appliances? A. Gas
appliances must be derated to compensate for lower oxygen
density B. Gas appliances must be uprated to compensate for
lower atmospheric pressure C. No adjustments are necessary up
to 5,000 feet D. Only propane appliances require adjustment,
not natural gas Correct Answer: A At elevations above
2,000 feet, the air is less dense, meaning there is less oxygen
available for combustion. Appliances must be derated (or
equipped with high-altitude kits) to prevent incomplete
combustion and the production of excessive carbon monoxide.
7. Corrugated Stainless Steel Tubing (CSST) must be
bonded to which of the following? A. The appliance
chassis only B. The electrical service grounding electrode
system C. The water piping system only D. The gas meter
regulator Correct Answer: B CSST must be bonded to the
electrical service grounding electrode system to protect the
piping from lightning-induced side-flash arcing, which can
puncture the thin walls of the tubing and cause a gas leak.
8. What is the minimum horizontal clearance required
for a gas vent terminal from an operable window,
door, or gravity air intake? A. 1 foot B. 3 feet C. 4 feet D. 6
feet Correct Answer: C The vent terminal must be located at
least 4 feet below, 4 feet horizontally from, or 1 foot above any
operable window, door, or gravity air intake to prevent
combustion products from re-entering the building.
9. What is the maximum length allowed for a flexible
appliance connector serving a movable appliance (e.g.,
a gas range)? A. 3 feet B. 6 feet C. 10 feet D. 12 feet Correct
Answer: B Flexible connectors for movable appliances (like
, ranges) are permitted to be up to 6 feet in length. For fixed
appliances (like water heaters), the maximum length is
typically 3 feet.
10. Which of the following materials is generally
prohibited for use as underground gas piping in New
Mexico unless specifically listed and protected against
corrosion? A. Copper tubing (Type K or L) B. Polyethylene
(PE) plastic pipe C. Coated steel pipe D. Cast iron Correct
Answer: A While copper tubing can be used for gas piping in
some specific above-ground applications, it is generally
prohibited for underground use unless it is specifically listed
for that purpose and protected against external corrosion, due
to the risk of corrosion from certain soil conditions.
11. When sizing gas piping using the Longest Length
Method, the pipe size is determined based on: A. The
distance from the meter to the furthest appliance and the total
load of all appliances B. The distance from the meter to each
individual appliance and the load of that appliance only C. The
shortest distance to the nearest appliance D. The pressure drop
across the gas meter only Correct Answer: A The Longest
Length Method sizes the entire piping system based on the
distance from the point of delivery (meter) to the most remote
outlet, and the total connected load of all appliances on that
run, ensuring adequate pressure at the furthest point.
12. A manual shutoff valve must be installed in the gas
supply line to an appliance. Where must this valve be
located? A. Inside the appliance casing B. Upstream of the
union and sediment trap, within 6 feet of the appliance, and in
the same room C. At the gas meter only D. Downstream of the
flexible connector Correct Answer: B The code requires an
accessible manual shutoff valve to be located in the same room
as the appliance, within 6 feet of the appliance, and upstream
of any union, sediment trap, or flexible connector.
FITTER EXAM 150 HIGH YIELD
TECHNICAL SCENARIOS FEATURING
DETAILED CORRECT ANSWERS WITH
RATIONALES AND CORRECT
VERIFIED ANSWERS INSTANT
DOWNLOAD GRADE A+
New Mexico Journeyman Natural Gas Fitter Practice
Exam
1. Which code is the primary standard adopted by New
Mexico for the installation of fuel gas piping systems
and appliances? A. International Mechanical Code (IMC) B.
NFPA 54 / ANSI Z223.1 (National Fuel Gas Code) C. Uniform
Plumbing Code (UPC) D. NFPA 58 (Liquefied Petroleum Gas
Code) Correct Answer: B NFPA 54 (National Fuel Gas
Code) is the primary standard adopted by the New Mexico
Construction Industries Division (CID) for the design,
installation, and inspection of natural gas and propane piping
systems and appliances.
2. According to the code, a room is considered a
"confined space" for combustion air purposes if its
volume is less than how many cubic feet per 1,000
Btu/hr of the total input rating of all appliances in the
space? A. 25 cubic feet B. 50 cubic feet C. 100 cubic feet D. 200
cubic feet Correct Answer: B A confined space is defined as
a space whose volume is less than 50 cubic feet per 1,000
Btu/hr of the aggregate input rating of all appliances installed
,in that space. Such spaces require specific methods for
providing combustion and ventilation air.
3. Where must a sediment trap (drip leg) be installed
on a gas appliance? A. Upstream of the manual shutoff valve
B. Downstream of the appliance shutoff valve, as close to the
inlet of the appliance as practical C. At the lowest point of the
main building supply line only D. Inside the gas meter regulator
Correct Answer: B A sediment trap must be installed
downstream of the appliance shutoff valve and as close to the
inlet of the appliance as practical to catch debris, moisture, or
pipe scale before it can enter the appliance controls.
4. When pressure testing a new gas piping system
operating at 14 inches water column (w.c.) or less,
what is the minimum test pressure and duration
required by NFPA 54? A. 3 psig for a minimum of 15
minutes B. 10 psig for a minimum of 1 hour C. 1.5 times the
operating pressure for 10 minutes D. 60 psig for a minimum of
2 hours Correct Answer: A For systems operating at 14
inches w.c. or less, the code requires a test pressure of at least
3 psig (or 1.5 times the operating pressure, whichever is
greater) sustained for a minimum of 15 minutes without a
drop in pressure.
5. When using the "Two Permanent Openings" method
to provide combustion air from indoors, what is the
minimum free area required for each opening? A. 1
square inch per 1,000 Btu/hr of total appliance input B. 1
square inch per 2,000 Btu/hr of total appliance input C. 1
square inch per 3,000 Btu/hr of total appliance input D. 1
square inch per 4,000 Btu/hr of total appliance input Correct
Answer: A When using two permanent openings (one within
12 inches of the ceiling and one within 12 inches of the floor) to
connect to another indoor space, each opening must have a
,minimum free area of 1 square inch per 1,000 Btu/hr of the
total input rating of all appliances.
6. In New Mexico, many installations occur at
elevations above 2,000 feet. How does high altitude
affect the installation of gas appliances? A. Gas
appliances must be derated to compensate for lower oxygen
density B. Gas appliances must be uprated to compensate for
lower atmospheric pressure C. No adjustments are necessary up
to 5,000 feet D. Only propane appliances require adjustment,
not natural gas Correct Answer: A At elevations above
2,000 feet, the air is less dense, meaning there is less oxygen
available for combustion. Appliances must be derated (or
equipped with high-altitude kits) to prevent incomplete
combustion and the production of excessive carbon monoxide.
7. Corrugated Stainless Steel Tubing (CSST) must be
bonded to which of the following? A. The appliance
chassis only B. The electrical service grounding electrode
system C. The water piping system only D. The gas meter
regulator Correct Answer: B CSST must be bonded to the
electrical service grounding electrode system to protect the
piping from lightning-induced side-flash arcing, which can
puncture the thin walls of the tubing and cause a gas leak.
8. What is the minimum horizontal clearance required
for a gas vent terminal from an operable window,
door, or gravity air intake? A. 1 foot B. 3 feet C. 4 feet D. 6
feet Correct Answer: C The vent terminal must be located at
least 4 feet below, 4 feet horizontally from, or 1 foot above any
operable window, door, or gravity air intake to prevent
combustion products from re-entering the building.
9. What is the maximum length allowed for a flexible
appliance connector serving a movable appliance (e.g.,
a gas range)? A. 3 feet B. 6 feet C. 10 feet D. 12 feet Correct
Answer: B Flexible connectors for movable appliances (like
, ranges) are permitted to be up to 6 feet in length. For fixed
appliances (like water heaters), the maximum length is
typically 3 feet.
10. Which of the following materials is generally
prohibited for use as underground gas piping in New
Mexico unless specifically listed and protected against
corrosion? A. Copper tubing (Type K or L) B. Polyethylene
(PE) plastic pipe C. Coated steel pipe D. Cast iron Correct
Answer: A While copper tubing can be used for gas piping in
some specific above-ground applications, it is generally
prohibited for underground use unless it is specifically listed
for that purpose and protected against external corrosion, due
to the risk of corrosion from certain soil conditions.
11. When sizing gas piping using the Longest Length
Method, the pipe size is determined based on: A. The
distance from the meter to the furthest appliance and the total
load of all appliances B. The distance from the meter to each
individual appliance and the load of that appliance only C. The
shortest distance to the nearest appliance D. The pressure drop
across the gas meter only Correct Answer: A The Longest
Length Method sizes the entire piping system based on the
distance from the point of delivery (meter) to the most remote
outlet, and the total connected load of all appliances on that
run, ensuring adequate pressure at the furthest point.
12. A manual shutoff valve must be installed in the gas
supply line to an appliance. Where must this valve be
located? A. Inside the appliance casing B. Upstream of the
union and sediment trap, within 6 feet of the appliance, and in
the same room C. At the gas meter only D. Downstream of the
flexible connector Correct Answer: B The code requires an
accessible manual shutoff valve to be located in the same room
as the appliance, within 6 feet of the appliance, and upstream
of any union, sediment trap, or flexible connector.
