California Gas Fitter Licensing Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum burial depth for underground gas piping in
California residential applications?
a. 6 inches
b. 12 inches
c. 18 inches
d. 24 inches
Gas piping must be buried a minimum of 18 inches to protect from
surface damage per CPC requirements.
2. Which type of piping material is NOT approved for use with natural
gas systems?
a. Steel
b. Copper (with proper approval)
c. Polyethylene (PE)
d. PVC
PVC is not approved for gas piping due to its low resistance to heat
and pressure.
,3. When testing a new gas piping system, the minimum pressure
required for a 10-minute leak test is:
a. 1 psi
b. 3 psi
c. 10 psi
d. 15 psi
California Plumbing Code mandates a 10 psi test for a minimum of 10
minutes with no drop in pressure.
4. What is the primary purpose of a sediment trap in a gas piping
installation?
a. To reduce pressure
b. To collect moisture and debris
c. To prevent gas leaks
d. To separate gases
Sediment traps prevent dirt and moisture from entering appliances,
protecting burners and valves.
5. What type of joint is typically used when connecting threaded steel
gas pipe?
a. Soldered
b. Threaded with pipe dope or Teflon tape
c. Compression
d. Brazed
Threaded joints sealed with pipe dope or approved tape are standard
for steel gas piping.
6. What is the maximum allowable pressure drop in a gas piping system?
a. 0.1 inch water column
b. 0.25 inch water column
c. 0.5 inch water column
d. 1.0 inch water column
, The CPC allows a maximum pressure drop of 0.5 inches water column
for low-pressure systems.
7. Black iron pipe used for gas systems is typically rated for:
a. Potable water
b. Drainage only
c. Gas and oil
d. Compressed air only
Black iron is specifically used for gas and oil piping due to its
durability and compatibility.
8. Flexible gas connectors are permitted when:
a. Buried underground
b. Longer than 6 feet
c. Connecting appliances that are movable
d. Used in concealed spaces
Flexible connectors are used for movable appliances like stoves but
must not pass through walls or floors.
9. Which of the following must be labeled on exposed gas piping?
a. Installation date
b. “Gas” or “Natural Gas” marking
c. Pressure rating
d. Installer’s license number
Proper labeling helps in quick identification for inspection and
maintenance.
10. What must be done before lighting a newly installed gas
appliance?
a. Paint it
b. Check for leaks and proper ventilation
c. Test the voltage
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download Pdf
1. What is the minimum burial depth for underground gas piping in
California residential applications?
a. 6 inches
b. 12 inches
c. 18 inches
d. 24 inches
Gas piping must be buried a minimum of 18 inches to protect from
surface damage per CPC requirements.
2. Which type of piping material is NOT approved for use with natural
gas systems?
a. Steel
b. Copper (with proper approval)
c. Polyethylene (PE)
d. PVC
PVC is not approved for gas piping due to its low resistance to heat
and pressure.
,3. When testing a new gas piping system, the minimum pressure
required for a 10-minute leak test is:
a. 1 psi
b. 3 psi
c. 10 psi
d. 15 psi
California Plumbing Code mandates a 10 psi test for a minimum of 10
minutes with no drop in pressure.
4. What is the primary purpose of a sediment trap in a gas piping
installation?
a. To reduce pressure
b. To collect moisture and debris
c. To prevent gas leaks
d. To separate gases
Sediment traps prevent dirt and moisture from entering appliances,
protecting burners and valves.
5. What type of joint is typically used when connecting threaded steel
gas pipe?
a. Soldered
b. Threaded with pipe dope or Teflon tape
c. Compression
d. Brazed
Threaded joints sealed with pipe dope or approved tape are standard
for steel gas piping.
6. What is the maximum allowable pressure drop in a gas piping system?
a. 0.1 inch water column
b. 0.25 inch water column
c. 0.5 inch water column
d. 1.0 inch water column
, The CPC allows a maximum pressure drop of 0.5 inches water column
for low-pressure systems.
7. Black iron pipe used for gas systems is typically rated for:
a. Potable water
b. Drainage only
c. Gas and oil
d. Compressed air only
Black iron is specifically used for gas and oil piping due to its
durability and compatibility.
8. Flexible gas connectors are permitted when:
a. Buried underground
b. Longer than 6 feet
c. Connecting appliances that are movable
d. Used in concealed spaces
Flexible connectors are used for movable appliances like stoves but
must not pass through walls or floors.
9. Which of the following must be labeled on exposed gas piping?
a. Installation date
b. “Gas” or “Natural Gas” marking
c. Pressure rating
d. Installer’s license number
Proper labeling helps in quick identification for inspection and
maintenance.
10. What must be done before lighting a newly installed gas
appliance?
a. Paint it
b. Check for leaks and proper ventilation
c. Test the voltage
