1
Which code is primarily referenced for gas piping installations in NYC for the
G-33 scope?
A. International Plumbing Code (IPC)
B. NYC Fuel Gas Code / NFPA 54 (National Fuel Gas Code)
C. NFPA 70 (National Electrical Code)
D. ASME B31.3
Answer: B.
Explanation: The NYC Fuel Gas Code and NFPA 54 (National Fuel Gas Code)
govern fuel gas piping and appliances.
2
What is the principal purpose of a gas shutoff valve at an appliance?
A. To regulate flow rate to appliance burners
B. To permit immediate isolation of gas supply to the appliance for service or
emergency
C. To measure gas pressure
D. To act as a relief valve
Answer: B.
Explanation: Appliance shutoff valves allow quick isolation of an appliance for
maintenance or emergency.
3
Before performing gas piping work in NYC, you must:
A. Start work immediately and notify inspector later
B. Obtain required permits and notify the Department of Buildings or
authorized agency if required
C. Only notify the gas company after work is finished
D. Only obtain verbal approval from the property owner
Answer: B.
,Explanation: Proper permits/notifications must be obtained before doing
regulated gas piping work.
4
Which material is commonly allowed for underground gas piping in NYC?
A. PVC schedule 40
B. Corrugated stainless steel tubing (CSST) without bonding
C. Steel pipe (black iron) or polyethylene (PE) specifically listed for gas
D. Copper tubing for all buried runs
Answer: C.
Explanation: Steel or listed PE pipe is commonly used underground; PVC is
not suitable for fuel gas; copper underground is restricted or requires conditions.
5
What test is required after installing a new gas piping system (before appliance
connection)?
A. Hydrostatic test with water only
B. Pressure or leak test per code (usually a soap test and/or pressure gauge test
at specified test pressure)
C. No test required if joints look tight
D. Electrical continuity test
Answer: B.
Explanation: Gas piping must be pressure-tested for leaks per code (test
pressure and duration specified).
6
If you detect a gas leak while working, your FIRST action should be:
A. Try to repair the leak immediately with tape
B. Extinguish any open flames, stop work, ventilate area, shut off gas supply,
and notify appropriate authorities
C. Call the property owner and continue working
D. Open a window and keep working
Answer: B.
Explanation: Safety first — control ignition sources, ventilate, isolate gas, and
notify authorities.
,7
What device reduces incoming gas pressure to the usable pressure for
appliances?
A. Relief valve
B. Pressure regulator
C. Needle valve
D. Check valve
Answer: B.
Explanation: A pressure regulator reduces and maintains gas pressure to
appliances at a safe, set level.
8
Which of the following is an approved method for making joints in black iron
gas piping?
A. Threaded connections using proper pipe thread and sealant
B. Soldered joints with lead-based solder
C. Glued solvent joints
D. Rubber couplings only
Answer: A.
Explanation: Black iron pipe is commonly joined with threaded fittings using
proper thread sealant; solder and solvent methods are not applicable.
9
What is the correct orientation of a sediment trap (drip leg) for a gas appliance?
A. Installed in the upright vertical position near the appliance gas valve
B. Installed horizontally far from the appliance
C. Not required by code
D. Installed upside down to drain to appliance
Answer: A.
Explanation: Sediment traps must be installed upright close to the appliance to
collect debris/liquids.
10
, CSST (corrugated stainless steel tubing) used for gas must be:
A. Installed without bonding or grounding
B. Bonded/grounded per manufacturer and code requirements to reduce
lightning risk
C. Painted for corrosion protection
D. Used only outdoors
Answer: B.
Explanation: CSST requires bonding/grounding per manufacturer instructions
and code to reduce lightning-related risks.
11
An appliance connector should:
A. Be as long as possible and not approved for the application
B. Be the shortest practical length, listed for the application, and properly
supported
C. Be made of rigid black iron only
D. Never have a shutoff valve inline
Answer: B.
Explanation: Flexible appliance connectors should be shortest feasible, listed,
and supported; shutoff valves are required before connectors.
12
What color is typically used to mark natural gas piping in exposed runs?
A. Red
B. Yellow
C. Blue
D. Green
Answer: B.
Explanation: Yellow is commonly used to identify gas piping, but local
markings may vary; yellow is the industry standard for gas.
13
Which is true about venting combustion appliances?
A. All gas appliances are direct-vent and need no flue
B. Atmospheric venting must follow code for sizing, rise, and termination
locations to ensure proper draft
Which code is primarily referenced for gas piping installations in NYC for the
G-33 scope?
A. International Plumbing Code (IPC)
B. NYC Fuel Gas Code / NFPA 54 (National Fuel Gas Code)
C. NFPA 70 (National Electrical Code)
D. ASME B31.3
Answer: B.
Explanation: The NYC Fuel Gas Code and NFPA 54 (National Fuel Gas Code)
govern fuel gas piping and appliances.
2
What is the principal purpose of a gas shutoff valve at an appliance?
A. To regulate flow rate to appliance burners
B. To permit immediate isolation of gas supply to the appliance for service or
emergency
C. To measure gas pressure
D. To act as a relief valve
Answer: B.
Explanation: Appliance shutoff valves allow quick isolation of an appliance for
maintenance or emergency.
3
Before performing gas piping work in NYC, you must:
A. Start work immediately and notify inspector later
B. Obtain required permits and notify the Department of Buildings or
authorized agency if required
C. Only notify the gas company after work is finished
D. Only obtain verbal approval from the property owner
Answer: B.
,Explanation: Proper permits/notifications must be obtained before doing
regulated gas piping work.
4
Which material is commonly allowed for underground gas piping in NYC?
A. PVC schedule 40
B. Corrugated stainless steel tubing (CSST) without bonding
C. Steel pipe (black iron) or polyethylene (PE) specifically listed for gas
D. Copper tubing for all buried runs
Answer: C.
Explanation: Steel or listed PE pipe is commonly used underground; PVC is
not suitable for fuel gas; copper underground is restricted or requires conditions.
5
What test is required after installing a new gas piping system (before appliance
connection)?
A. Hydrostatic test with water only
B. Pressure or leak test per code (usually a soap test and/or pressure gauge test
at specified test pressure)
C. No test required if joints look tight
D. Electrical continuity test
Answer: B.
Explanation: Gas piping must be pressure-tested for leaks per code (test
pressure and duration specified).
6
If you detect a gas leak while working, your FIRST action should be:
A. Try to repair the leak immediately with tape
B. Extinguish any open flames, stop work, ventilate area, shut off gas supply,
and notify appropriate authorities
C. Call the property owner and continue working
D. Open a window and keep working
Answer: B.
Explanation: Safety first — control ignition sources, ventilate, isolate gas, and
notify authorities.
,7
What device reduces incoming gas pressure to the usable pressure for
appliances?
A. Relief valve
B. Pressure regulator
C. Needle valve
D. Check valve
Answer: B.
Explanation: A pressure regulator reduces and maintains gas pressure to
appliances at a safe, set level.
8
Which of the following is an approved method for making joints in black iron
gas piping?
A. Threaded connections using proper pipe thread and sealant
B. Soldered joints with lead-based solder
C. Glued solvent joints
D. Rubber couplings only
Answer: A.
Explanation: Black iron pipe is commonly joined with threaded fittings using
proper thread sealant; solder and solvent methods are not applicable.
9
What is the correct orientation of a sediment trap (drip leg) for a gas appliance?
A. Installed in the upright vertical position near the appliance gas valve
B. Installed horizontally far from the appliance
C. Not required by code
D. Installed upside down to drain to appliance
Answer: A.
Explanation: Sediment traps must be installed upright close to the appliance to
collect debris/liquids.
10
, CSST (corrugated stainless steel tubing) used for gas must be:
A. Installed without bonding or grounding
B. Bonded/grounded per manufacturer and code requirements to reduce
lightning risk
C. Painted for corrosion protection
D. Used only outdoors
Answer: B.
Explanation: CSST requires bonding/grounding per manufacturer instructions
and code to reduce lightning-related risks.
11
An appliance connector should:
A. Be as long as possible and not approved for the application
B. Be the shortest practical length, listed for the application, and properly
supported
C. Be made of rigid black iron only
D. Never have a shutoff valve inline
Answer: B.
Explanation: Flexible appliance connectors should be shortest feasible, listed,
and supported; shutoff valves are required before connectors.
12
What color is typically used to mark natural gas piping in exposed runs?
A. Red
B. Yellow
C. Blue
D. Green
Answer: B.
Explanation: Yellow is commonly used to identify gas piping, but local
markings may vary; yellow is the industry standard for gas.
13
Which is true about venting combustion appliances?
A. All gas appliances are direct-vent and need no flue
B. Atmospheric venting must follow code for sizing, rise, and termination
locations to ensure proper draft
