MINNEAPOLIS MASTER PLUMBER/GASFITTER
EXAMINATION 2026 LATEST EXAM WITH
ACTUAL QUESTIONS AND CORRECT ANSWERS
(100% VERIFIED ANSWERS) NEWEST
UPDATE!!!!
SECTION 1: FUEL GAS - GENERAL REGULATIONS (QUESTIONS 1-60)
1. Gas piping must not enter a building:
A. Above ground
B. Underground
C. Through a wall
D. Through a roof
Answer: B
Rationale: Per the International Fuel Gas Code, gas piping is prohibited from
entering buildings underground because underground spaces can trap leaking gas,
creating explosion hazards.
2. Where gas piping is required to be installed in conduit and one end
terminates outdoors, the conduit must extend not less than _____ outside the
building.
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Answer: C
Rationale: The IFGC requires that conduit containing gas piping extend a
minimum of 4 inches beyond the exterior building wall when terminating outdoors.
,3. A required conduit containing gas piping must extend not less than _____
beyond the point where the pipe emerges from the floor inside the building.
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Answer: B
Rationale: The conduit must extend at least 2 inches above the floor surface inside
the building to protect the gas piping from physical damage.
4. Exterior above-ground gas piping must be elevated not less than _____
above ground and roof surfaces.
A. 2 inches
B. 3 inches
C. 3½ inches
D. 6 inches
Answer: C
Rationale: The IFGC specifies a minimum elevation of 3½ inches for exterior
above-ground gas piping to prevent corrosion and allow for drainage.
5. In general, underground gas piping systems must be installed at a minimum
depth of _____ below grade.
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B
Rationale: The minimum burial depth for underground gas piping is 12 inches
below grade unless otherwise specified for specific conditions or materials.
6. The un-threaded portion of gas piping outlets must extend not less than
_____ beyond finished ceilings and walls.
A. ½ inch
B. 1 inch
,C. 1½ inches
D. 2 inches
Answer: B
Rationale: Gas piping outlets must extend at least 1 inch beyond finished surfaces
to allow proper connection of appliances.
7. Plastic gas pipe is generally permitted to be installed:
A. Indoors above ground
B. Indoors underground
C. Outdoors underground only
D. Anywhere if protected
Answer: C
Rationale: Plastic gas piping is restricted to outdoor underground installations due
to its susceptibility to UV degradation and physical damage.
8. Underground nonmetallic gas piping must have a yellow insulated copper
tracer wire not less than _____ AWG.
A. 14
B. 16
C. 18
D. 20
Answer: C
Rationale: An 18 AWG yellow insulated copper tracer wire is required to allow
locating underground plastic gas piping.
9. Oxygen is prohibited from being used for testing gas piping because:
A. It is too expensive
B. It can cause explosions when combined with gas residue
C. It is not readily available
D. It freezes at low temperatures
Answer: B
Rationale: Oxygen must never be used for pressure testing gas piping as it creates
an explosive atmosphere when combined with any residual fuel gas.
, 10. The test duration for testing a gas piping system with a volume less than 10
cubic feet must be not less than _____ minutes.
A. 5
B. 10
C. 15
D. 30
Answer: B
Rationale: Gas piping systems with a volume less than 10 cubic feet require a
minimum 10-minute pressure test.
11. The test pressure must be not less than _____ times the proposed
maximum working pressure of the gas piping system.
A. 1
B. 1½
C. 2
D. 3
Answer: B
Rationale: The minimum test pressure is 1½ times the maximum working pressure
of the system being tested.
12. What is the level of accuracy prescribed by the IFGC for the display of a
combustible gas indicator used for purging fuel gas piping?
A. 5 percent
B. 2 percent
C. 1 percent or smaller
D. 0.5 percent
Answer: C
Rationale: Combustible gas indicators must have an accuracy of 1 percent or
smaller for purging operations to ensure safe gas concentration readings.
13. Supports for 1-inch steel gas piping shall be spaced no more than _____
apart.
A. 6 feet
B. 8 feet
EXAMINATION 2026 LATEST EXAM WITH
ACTUAL QUESTIONS AND CORRECT ANSWERS
(100% VERIFIED ANSWERS) NEWEST
UPDATE!!!!
SECTION 1: FUEL GAS - GENERAL REGULATIONS (QUESTIONS 1-60)
1. Gas piping must not enter a building:
A. Above ground
B. Underground
C. Through a wall
D. Through a roof
Answer: B
Rationale: Per the International Fuel Gas Code, gas piping is prohibited from
entering buildings underground because underground spaces can trap leaking gas,
creating explosion hazards.
2. Where gas piping is required to be installed in conduit and one end
terminates outdoors, the conduit must extend not less than _____ outside the
building.
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
Answer: C
Rationale: The IFGC requires that conduit containing gas piping extend a
minimum of 4 inches beyond the exterior building wall when terminating outdoors.
,3. A required conduit containing gas piping must extend not less than _____
beyond the point where the pipe emerges from the floor inside the building.
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Answer: B
Rationale: The conduit must extend at least 2 inches above the floor surface inside
the building to protect the gas piping from physical damage.
4. Exterior above-ground gas piping must be elevated not less than _____
above ground and roof surfaces.
A. 2 inches
B. 3 inches
C. 3½ inches
D. 6 inches
Answer: C
Rationale: The IFGC specifies a minimum elevation of 3½ inches for exterior
above-ground gas piping to prevent corrosion and allow for drainage.
5. In general, underground gas piping systems must be installed at a minimum
depth of _____ below grade.
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Answer: B
Rationale: The minimum burial depth for underground gas piping is 12 inches
below grade unless otherwise specified for specific conditions or materials.
6. The un-threaded portion of gas piping outlets must extend not less than
_____ beyond finished ceilings and walls.
A. ½ inch
B. 1 inch
,C. 1½ inches
D. 2 inches
Answer: B
Rationale: Gas piping outlets must extend at least 1 inch beyond finished surfaces
to allow proper connection of appliances.
7. Plastic gas pipe is generally permitted to be installed:
A. Indoors above ground
B. Indoors underground
C. Outdoors underground only
D. Anywhere if protected
Answer: C
Rationale: Plastic gas piping is restricted to outdoor underground installations due
to its susceptibility to UV degradation and physical damage.
8. Underground nonmetallic gas piping must have a yellow insulated copper
tracer wire not less than _____ AWG.
A. 14
B. 16
C. 18
D. 20
Answer: C
Rationale: An 18 AWG yellow insulated copper tracer wire is required to allow
locating underground plastic gas piping.
9. Oxygen is prohibited from being used for testing gas piping because:
A. It is too expensive
B. It can cause explosions when combined with gas residue
C. It is not readily available
D. It freezes at low temperatures
Answer: B
Rationale: Oxygen must never be used for pressure testing gas piping as it creates
an explosive atmosphere when combined with any residual fuel gas.
, 10. The test duration for testing a gas piping system with a volume less than 10
cubic feet must be not less than _____ minutes.
A. 5
B. 10
C. 15
D. 30
Answer: B
Rationale: Gas piping systems with a volume less than 10 cubic feet require a
minimum 10-minute pressure test.
11. The test pressure must be not less than _____ times the proposed
maximum working pressure of the gas piping system.
A. 1
B. 1½
C. 2
D. 3
Answer: B
Rationale: The minimum test pressure is 1½ times the maximum working pressure
of the system being tested.
12. What is the level of accuracy prescribed by the IFGC for the display of a
combustible gas indicator used for purging fuel gas piping?
A. 5 percent
B. 2 percent
C. 1 percent or smaller
D. 0.5 percent
Answer: C
Rationale: Combustible gas indicators must have an accuracy of 1 percent or
smaller for purging operations to ensure safe gas concentration readings.
13. Supports for 1-inch steel gas piping shall be spaced no more than _____
apart.
A. 6 feet
B. 8 feet
