CALIFORNIA GAS FITTER LICENSING EXAM
ACTUAL QUESTIONS AND ANSWERS - LATEST
AND COMPLETE UPDATE WITH VERIFIED
SOLUTIONS – ASSURED PASS WITH INSTANT
DOWNLOAD PDF.
1. A gas fitter is sizing a low-pressure natural gas piping system for a
residential installation. Which factor MOST directly determines the
minimum pipe diameter required for each section?
A. Appliance BTU input only
B. Developed length and total connected load
C. Meter capacity only
D. Elevation above sea level only
Rationale: Pipe sizing under the California Plumbing Code and NFPA 54 is
based on the longest developed length of the system and the total connected
load served by each segment.
2. When working on an existing gas system, which condition requires the gas
fitter to immediately shut off gas service before proceeding?
A. Minor corrosion on exposed piping
B. Active gas leak detected by instrument
C. Appliance older than 10 years
D. Missing appliance data plate
Rationale: An active gas leak presents an immediate hazard and requires
shutoff to eliminate risk of fire or explosion before any work continues.
3. Which material is permitted for interior natural gas piping in California
when installed according to code?
A. PVC Schedule 40
, B. Black steel pipe
C. ABS plastic
D. Copper Type M without protection
Rationale: Black steel pipe is a standard approved material; plastics like
PVC/ABS are prohibited, and copper use is restricted and must meet specific
requirements.
4. A pressure test on a newly installed gas line shows a pressure drop during
the test period. What is the MOST appropriate next action?
A. Increase test pressure
B. Retighten all fittings without depressurizing
C. Locate and repair leaks, then retest
D. Place system into service if drop is minimal
Rationale: Any pressure drop indicates leakage; code requires leaks be
corrected and the system retested before approval.
5. Which code primarily governs fuel gas installations in California?
A. National Electrical Code
B. California Plumbing Code
C. California Building Code only
D. Uniform Fire Code
Rationale: The California Plumbing Code, incorporating fuel gas
provisions, governs gas installations statewide.
6. A gas appliance requires 1 inch water column (WC) inlet pressure at full
load. The measured pressure is 0.6 inch WC. What is the MOST likely
cause?
A. Oversized gas meter
B. Undersized piping or excessive pressure drop
C. Faulty appliance regulator increasing pressure
, D. Incorrect orifice size increasing pressure
Rationale: Low inlet pressure is commonly caused by undersized piping or
excessive system pressure loss.
7. Which device is designed to automatically shut off gas flow during a seismic
event in California?
A. Excess flow valve
B. Seismic gas shutoff valve
C. Appliance regulator
D. Manual service cock
Rationale: Seismic gas shutoff valves are required in many California
jurisdictions to reduce post-earthquake fire risk.
8. When purging air from a new gas line, which safety practice is REQUIRED?
A. Purge indoors for faster completion
B. Use open flame to verify gas presence
C. Vent gas to a safe outdoor location
D. Purge only after appliance connection
Rationale: Purging must be done safely outdoors or to an approved location
to prevent accumulation of flammable gas.
9. What is the primary purpose of a drip leg (sediment trap)?
A. Reduce gas pressure
B. Collect debris and condensate
C. Increase gas velocity
D. Prevent backflow
Rationale: Drip legs trap debris and moisture, protecting appliance controls
from contamination.
10.Which professional responsibility applies to licensed gas fitters in
California?
, A. Work without permits for minor repairs
B. Delegate gas work to unlicensed helpers
C. Comply with permitting and inspection requirements
D. Ignore manufacturer installation instructions if code-compliant
Rationale: Permits, inspections, and adherence to manufacturer instructions
are mandatory professional obligations.
11.A flexible appliance connector is permitted only when it:
A. Is concealed within walls
B. Is listed and installed per manufacturer instructions
C. Exceeds 10 feet in length
D. Replaces all rigid piping
Rationale: Only listed connectors installed as specified are allowed;
concealment and excessive length are prohibited.
12.Which gas has a higher heating value per cubic foot under standard
conditions?
A. Propane vapor
B. Natural gas
C. Air
D. Carbon dioxide
Rationale: Natural gas has a defined heating value per cubic foot; air and
CO₂ are non-fuels.
13.A gas fitter discovers undocumented modifications to an existing system.
What is the MOST appropriate action?
A. Ignore and continue work
B. Remove all existing piping
C. Document, inform the client, and correct as required
D. Report directly to law enforcement
ACTUAL QUESTIONS AND ANSWERS - LATEST
AND COMPLETE UPDATE WITH VERIFIED
SOLUTIONS – ASSURED PASS WITH INSTANT
DOWNLOAD PDF.
1. A gas fitter is sizing a low-pressure natural gas piping system for a
residential installation. Which factor MOST directly determines the
minimum pipe diameter required for each section?
A. Appliance BTU input only
B. Developed length and total connected load
C. Meter capacity only
D. Elevation above sea level only
Rationale: Pipe sizing under the California Plumbing Code and NFPA 54 is
based on the longest developed length of the system and the total connected
load served by each segment.
2. When working on an existing gas system, which condition requires the gas
fitter to immediately shut off gas service before proceeding?
A. Minor corrosion on exposed piping
B. Active gas leak detected by instrument
C. Appliance older than 10 years
D. Missing appliance data plate
Rationale: An active gas leak presents an immediate hazard and requires
shutoff to eliminate risk of fire or explosion before any work continues.
3. Which material is permitted for interior natural gas piping in California
when installed according to code?
A. PVC Schedule 40
, B. Black steel pipe
C. ABS plastic
D. Copper Type M without protection
Rationale: Black steel pipe is a standard approved material; plastics like
PVC/ABS are prohibited, and copper use is restricted and must meet specific
requirements.
4. A pressure test on a newly installed gas line shows a pressure drop during
the test period. What is the MOST appropriate next action?
A. Increase test pressure
B. Retighten all fittings without depressurizing
C. Locate and repair leaks, then retest
D. Place system into service if drop is minimal
Rationale: Any pressure drop indicates leakage; code requires leaks be
corrected and the system retested before approval.
5. Which code primarily governs fuel gas installations in California?
A. National Electrical Code
B. California Plumbing Code
C. California Building Code only
D. Uniform Fire Code
Rationale: The California Plumbing Code, incorporating fuel gas
provisions, governs gas installations statewide.
6. A gas appliance requires 1 inch water column (WC) inlet pressure at full
load. The measured pressure is 0.6 inch WC. What is the MOST likely
cause?
A. Oversized gas meter
B. Undersized piping or excessive pressure drop
C. Faulty appliance regulator increasing pressure
, D. Incorrect orifice size increasing pressure
Rationale: Low inlet pressure is commonly caused by undersized piping or
excessive system pressure loss.
7. Which device is designed to automatically shut off gas flow during a seismic
event in California?
A. Excess flow valve
B. Seismic gas shutoff valve
C. Appliance regulator
D. Manual service cock
Rationale: Seismic gas shutoff valves are required in many California
jurisdictions to reduce post-earthquake fire risk.
8. When purging air from a new gas line, which safety practice is REQUIRED?
A. Purge indoors for faster completion
B. Use open flame to verify gas presence
C. Vent gas to a safe outdoor location
D. Purge only after appliance connection
Rationale: Purging must be done safely outdoors or to an approved location
to prevent accumulation of flammable gas.
9. What is the primary purpose of a drip leg (sediment trap)?
A. Reduce gas pressure
B. Collect debris and condensate
C. Increase gas velocity
D. Prevent backflow
Rationale: Drip legs trap debris and moisture, protecting appliance controls
from contamination.
10.Which professional responsibility applies to licensed gas fitters in
California?
, A. Work without permits for minor repairs
B. Delegate gas work to unlicensed helpers
C. Comply with permitting and inspection requirements
D. Ignore manufacturer installation instructions if code-compliant
Rationale: Permits, inspections, and adherence to manufacturer instructions
are mandatory professional obligations.
11.A flexible appliance connector is permitted only when it:
A. Is concealed within walls
B. Is listed and installed per manufacturer instructions
C. Exceeds 10 feet in length
D. Replaces all rigid piping
Rationale: Only listed connectors installed as specified are allowed;
concealment and excessive length are prohibited.
12.Which gas has a higher heating value per cubic foot under standard
conditions?
A. Propane vapor
B. Natural gas
C. Air
D. Carbon dioxide
Rationale: Natural gas has a defined heating value per cubic foot; air and
CO₂ are non-fuels.
13.A gas fitter discovers undocumented modifications to an existing system.
What is the MOST appropriate action?
A. Ignore and continue work
B. Remove all existing piping
C. Document, inform the client, and correct as required
D. Report directly to law enforcement
