MASTER-Plumbing Test Questions All
Answered Correctly 2025-2026
Updated.
Which of the following traps are permitted by special permission?
A. bell
B. S
C. drum
D. crown vented trap - Answer C
A roof mounted ari conditioner unit is condensing at the rate of 5 GPM. How much DFU?
A. 4
B. 5
C. 10
D. 12 - Answer B
According to the International Plumbing Code, when plastic piping is installed in a concealed
location and passing through a stud joist or rafter, the piping may not pass any closer than ___
inches from the edge of the wood member.
A. 3/4
B. 1
C. 1 1/4
D. 1 1/2 - Answer D
The measured length along the centerline of the pip and its fittings is?
A. true length
B. measured length
C. developed length
D. actual length - Answer C
What is the approximated number of threads for a 2 1/2" schedule 40 pipe which will be used in
a fuel gas piping system?
A. 9
B. 10
C. 11
,D. 12 - Answer D
.43 PSI = How many Feet of Head?
A. 1
B. 2.31
C. 4.4
D. 43 - Answer A
What is the PSI at the bottom of the drainage pipe if the test for a 4" drainage system is 30' of
head?
A. 15 psi
B. 14 psi
C. 13 psi
D. 12 psi - Answer D
PSI = feet of head x .433
30 (feet of head) x .433 = 12.99
When gas piping is installed through wood studs and is less than 1 1/4" from the nearest end of
the stud, the point of passage shall be protected with a face plate not less than ___.
A. 1/32
B. 1/16
C. 3/32
D. 1/8 - Answer B
What is the corresponding feet of head in a sprinkler system whose pressure is 40 PSI?
A. 93
B. 112
C. 117
D. 116 - Answer A
Feet of head is 2.31 x PSI
40 x 2.325= 93
A multimeter would test for which of the following?
, A. current
B. CFM
C. CFH
D. gallons per hour - Answer A
How is the vent from an indirect waste pipe run to the outside?
A. separately, unconnected
B. within an approved partition
C. vertically only
D. may be jointed to another vent prior to exiting the roof as long as the joining is above the
ceiling - Answer A
If the claim be for the planting of any trees, vines, plants or hedge, the lien must be filed within
4 months of the ___.
A. planting
B. purchase
C. contract signing
D. delivery - Answer A
Which of the following codes has been adopted as the plumbing code for Oklahoma?
A. UPC
B. IPC
C. 1997 UPC
D. 1997 IPC - Answer D
Which of the following conditions best describes corrosion protection for fuel gas piping which
is buried in the ground?
I. Protected in an approved manner such as galvanizing.
II. Machine wrapped with approved coating.
A. I
B. II
C. Both I & II
D. Neither I nor II - Answer B
What is the center line rough in dimension of urinals?
A. 36 inches
Answered Correctly 2025-2026
Updated.
Which of the following traps are permitted by special permission?
A. bell
B. S
C. drum
D. crown vented trap - Answer C
A roof mounted ari conditioner unit is condensing at the rate of 5 GPM. How much DFU?
A. 4
B. 5
C. 10
D. 12 - Answer B
According to the International Plumbing Code, when plastic piping is installed in a concealed
location and passing through a stud joist or rafter, the piping may not pass any closer than ___
inches from the edge of the wood member.
A. 3/4
B. 1
C. 1 1/4
D. 1 1/2 - Answer D
The measured length along the centerline of the pip and its fittings is?
A. true length
B. measured length
C. developed length
D. actual length - Answer C
What is the approximated number of threads for a 2 1/2" schedule 40 pipe which will be used in
a fuel gas piping system?
A. 9
B. 10
C. 11
,D. 12 - Answer D
.43 PSI = How many Feet of Head?
A. 1
B. 2.31
C. 4.4
D. 43 - Answer A
What is the PSI at the bottom of the drainage pipe if the test for a 4" drainage system is 30' of
head?
A. 15 psi
B. 14 psi
C. 13 psi
D. 12 psi - Answer D
PSI = feet of head x .433
30 (feet of head) x .433 = 12.99
When gas piping is installed through wood studs and is less than 1 1/4" from the nearest end of
the stud, the point of passage shall be protected with a face plate not less than ___.
A. 1/32
B. 1/16
C. 3/32
D. 1/8 - Answer B
What is the corresponding feet of head in a sprinkler system whose pressure is 40 PSI?
A. 93
B. 112
C. 117
D. 116 - Answer A
Feet of head is 2.31 x PSI
40 x 2.325= 93
A multimeter would test for which of the following?
, A. current
B. CFM
C. CFH
D. gallons per hour - Answer A
How is the vent from an indirect waste pipe run to the outside?
A. separately, unconnected
B. within an approved partition
C. vertically only
D. may be jointed to another vent prior to exiting the roof as long as the joining is above the
ceiling - Answer A
If the claim be for the planting of any trees, vines, plants or hedge, the lien must be filed within
4 months of the ___.
A. planting
B. purchase
C. contract signing
D. delivery - Answer A
Which of the following codes has been adopted as the plumbing code for Oklahoma?
A. UPC
B. IPC
C. 1997 UPC
D. 1997 IPC - Answer D
Which of the following conditions best describes corrosion protection for fuel gas piping which
is buried in the ground?
I. Protected in an approved manner such as galvanizing.
II. Machine wrapped with approved coating.
A. I
B. II
C. Both I & II
D. Neither I nor II - Answer B
What is the center line rough in dimension of urinals?
A. 36 inches
