2026 Advanced Plumbing Code
Applicators Examination|||questions
and answers with rationales/graded
A+/2026 update/100% correct /instant
download
School: National Institute of Plumbing Technologies
Exam Code: PLB-2026-ADV
Time Allowed: 120 minutes
Total Questions: 85
Passing Score: 75% (64 correct)
Instructions: Select the single best answer. Rationales are provided for correct
choices.
Section A: Fixtures, Traps, and Interceptors (Questions 1-20)
1. According to the 2026 UPC, what is the minimum trap size for a public laundry
sink?
A) 1-1/4 inches
B) 1-1/2 inches
C) 2 inches
D) 2-1/2 inches
Rationale: C – UPC 2026 Table 10-1 mandates a 2-inch trap for public laundry
sinks due to high lint and solids discharge.
2. When two sinks share a continuous waste fitting and a single trap, what is that
fitting called?
A) Double sanitary tee
B) Continuous waste (fixture connection) fitting
C) Double wye
D) Fixture cross
,Rationale: B – Per IPC 2026 Section 706.3, a continuous waste fitting connects
multiple compartments of the same fixture to one trap.
3. The maximum vertical distance from a fixture outlet to the trap weir is:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Rationale: C – UPC 2026 Section 1002.1 allows 24 inches; longer distances cause
self-siphonage.
4. Grease interceptors for commercial kitchens must be sized based on _____
according to 2026 IAPMO standards.
A) Building square footage
B) Total fixture drainage fixture units and flow rate
C) Number of cooks
D) Exhaust hood size
Rationale: B – 2026 Uniform Plumbing Code (Green Supplement) uses flow-rate-
based sizing (GPM) plus solids retention.
5. A hair salon with three shampoo bowls requires what type of interceptor?
A) Sand interceptor
B) Oil separator
C) Hair/lint interceptor
D) Grease interceptor
Rationale: C – 2026 IPC Chapter 10 adds hair interceptors for any facility with
five or more hair-washing stations; three bowls still require it if daily volume >200
gal.
6. Trap seal loss due to momentum (self-siphonage) is most likely in a:
A) Floor drain with long horizontal run
B) Lavatory with a 32-inch vertical drop from the basin to trap
C) Water closet with 4-foot horizontal outlet pipe
D) Shower with three drains
Rationale: B – Long vertical drop increases velocity, which strips the trap seal.
7. Which fixture is NOT required to be individually trapped?
A) Kitchen sink
, B) Laundry tub
C) Urinal with integral integral trap (listed)
D) Floor drain
Rationale: C – Urinals listed with an integral trap are exempt from a separate trap
seal.
8. The minimum trap seal depth for a 3-inch trap is:
A) 1-1/2 inches
B) 2 inches
C) 2-1/2 inches
D) 3 inches
Rationale: B – UPC 2026 Section 1003.1 requires 2” to 4” seal depth regardless of
trap size.
9. A solids interceptor for a meat-packing plant must be cleaned how often per
2026 NSF/ANSI 41?
A) Monthly
B) When 25% of the solids retention capacity is filled
C) Annually
D) Every 90 days
Rationale: B – 2026 Green Code requires cleaning at 25% fill to prevent hydrogen
sulfide generation.
10. Which of the following is NOT a listed trap type?
A) P-trap
B) S-trap
C) Drum trap
D) J-bend trap
Rationale: D – J-bend is not a code-recognized trap type; P, S, and drum traps are
recognized.
11. The maximum allowable trap arm length for a 1-1/2-inch trap (UPC 2026) is:
A) 3 feet 6 inches
B) 5 feet
C) 6 feet
D) 10 feet
Applicators Examination|||questions
and answers with rationales/graded
A+/2026 update/100% correct /instant
download
School: National Institute of Plumbing Technologies
Exam Code: PLB-2026-ADV
Time Allowed: 120 minutes
Total Questions: 85
Passing Score: 75% (64 correct)
Instructions: Select the single best answer. Rationales are provided for correct
choices.
Section A: Fixtures, Traps, and Interceptors (Questions 1-20)
1. According to the 2026 UPC, what is the minimum trap size for a public laundry
sink?
A) 1-1/4 inches
B) 1-1/2 inches
C) 2 inches
D) 2-1/2 inches
Rationale: C – UPC 2026 Table 10-1 mandates a 2-inch trap for public laundry
sinks due to high lint and solids discharge.
2. When two sinks share a continuous waste fitting and a single trap, what is that
fitting called?
A) Double sanitary tee
B) Continuous waste (fixture connection) fitting
C) Double wye
D) Fixture cross
,Rationale: B – Per IPC 2026 Section 706.3, a continuous waste fitting connects
multiple compartments of the same fixture to one trap.
3. The maximum vertical distance from a fixture outlet to the trap weir is:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Rationale: C – UPC 2026 Section 1002.1 allows 24 inches; longer distances cause
self-siphonage.
4. Grease interceptors for commercial kitchens must be sized based on _____
according to 2026 IAPMO standards.
A) Building square footage
B) Total fixture drainage fixture units and flow rate
C) Number of cooks
D) Exhaust hood size
Rationale: B – 2026 Uniform Plumbing Code (Green Supplement) uses flow-rate-
based sizing (GPM) plus solids retention.
5. A hair salon with three shampoo bowls requires what type of interceptor?
A) Sand interceptor
B) Oil separator
C) Hair/lint interceptor
D) Grease interceptor
Rationale: C – 2026 IPC Chapter 10 adds hair interceptors for any facility with
five or more hair-washing stations; three bowls still require it if daily volume >200
gal.
6. Trap seal loss due to momentum (self-siphonage) is most likely in a:
A) Floor drain with long horizontal run
B) Lavatory with a 32-inch vertical drop from the basin to trap
C) Water closet with 4-foot horizontal outlet pipe
D) Shower with three drains
Rationale: B – Long vertical drop increases velocity, which strips the trap seal.
7. Which fixture is NOT required to be individually trapped?
A) Kitchen sink
, B) Laundry tub
C) Urinal with integral integral trap (listed)
D) Floor drain
Rationale: C – Urinals listed with an integral trap are exempt from a separate trap
seal.
8. The minimum trap seal depth for a 3-inch trap is:
A) 1-1/2 inches
B) 2 inches
C) 2-1/2 inches
D) 3 inches
Rationale: B – UPC 2026 Section 1003.1 requires 2” to 4” seal depth regardless of
trap size.
9. A solids interceptor for a meat-packing plant must be cleaned how often per
2026 NSF/ANSI 41?
A) Monthly
B) When 25% of the solids retention capacity is filled
C) Annually
D) Every 90 days
Rationale: B – 2026 Green Code requires cleaning at 25% fill to prevent hydrogen
sulfide generation.
10. Which of the following is NOT a listed trap type?
A) P-trap
B) S-trap
C) Drum trap
D) J-bend trap
Rationale: D – J-bend is not a code-recognized trap type; P, S, and drum traps are
recognized.
11. The maximum allowable trap arm length for a 1-1/2-inch trap (UPC 2026) is:
A) 3 feet 6 inches
B) 5 feet
C) 6 feet
D) 10 feet
