1|Page
2021 INTERNATIONAL FUEL GAS CODE
(IFGC) PRACTICE EXAM QUESTIONS WITH
SOLUTIONS
Question 1
What is the minimum required burial depth for a metallic gas service line installed
under a driveway?
A. 18 inches
B. 24 inches
C. 36 inches
D. 12 inches
Correct Answer: B
Rationale: The IFGC requires a minimum cover of 24 inches for metallic gas piping
under driveways and other vehicular traffic areas to prevent damage from surface
loads .
Question 2
Which of the following materials is NOT permitted for use in a natural gas piping
system above ground?
,2|Page
A. Schedule 40 steel pipe
B. Copper tubing (Type K)
C. PVC pipe
D. Corrugated stainless steel tubing (CSST)
Correct Answer: C
Rationale: PVC is not permitted for fuel gas piping systems above ground due to
its susceptibility to damage from impact, UV degradation, and inability to
withstand fire conditions .
Question 3
A sediment trap (drip leg) is required at the lowest point of a gas piping system.
What is the minimum length of the sediment trap?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Correct Answer: B
, 3|Page
Rationale: The IFGC specifies that a sediment trap must have a minimum length of
3 inches to effectively collect debris and moisture from the gas stream before it
reaches the appliance .
Question 4
The primary purpose of a gas appliance pressure regulator is to:
A. Increase the flow of gas to the appliance
B. Shut off the gas supply in an emergency
C. Reduce and maintain a steady pressure to the appliance burner
D. Filter impurities from the gas stream
Correct Answer: C
Rationale: A pressure regulator is designed to reduce the higher supply pressure
to a lower, consistent pressure suitable for the appliance's burner operation,
ensuring efficient and safe combustion .
Question 5
Gas appliances shall not be permitted to be installed in which of the following
locations?
2021 INTERNATIONAL FUEL GAS CODE
(IFGC) PRACTICE EXAM QUESTIONS WITH
SOLUTIONS
Question 1
What is the minimum required burial depth for a metallic gas service line installed
under a driveway?
A. 18 inches
B. 24 inches
C. 36 inches
D. 12 inches
Correct Answer: B
Rationale: The IFGC requires a minimum cover of 24 inches for metallic gas piping
under driveways and other vehicular traffic areas to prevent damage from surface
loads .
Question 2
Which of the following materials is NOT permitted for use in a natural gas piping
system above ground?
,2|Page
A. Schedule 40 steel pipe
B. Copper tubing (Type K)
C. PVC pipe
D. Corrugated stainless steel tubing (CSST)
Correct Answer: C
Rationale: PVC is not permitted for fuel gas piping systems above ground due to
its susceptibility to damage from impact, UV degradation, and inability to
withstand fire conditions .
Question 3
A sediment trap (drip leg) is required at the lowest point of a gas piping system.
What is the minimum length of the sediment trap?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Correct Answer: B
, 3|Page
Rationale: The IFGC specifies that a sediment trap must have a minimum length of
3 inches to effectively collect debris and moisture from the gas stream before it
reaches the appliance .
Question 4
The primary purpose of a gas appliance pressure regulator is to:
A. Increase the flow of gas to the appliance
B. Shut off the gas supply in an emergency
C. Reduce and maintain a steady pressure to the appliance burner
D. Filter impurities from the gas stream
Correct Answer: C
Rationale: A pressure regulator is designed to reduce the higher supply pressure
to a lower, consistent pressure suitable for the appliance's burner operation,
ensuring efficient and safe combustion .
Question 5
Gas appliances shall not be permitted to be installed in which of the following
locations?
