ASSE 5000 – PROFESSIONAL
QUALIFICATION STANDARD (PQS) EXAM
QUESTION AND CORRECT
ANSWERS(VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A INSTANT
DOWNLOAD PDF
1. The primary purpose of the ASSE 5000 certification is to validate
competency in:
A. Residential plumbing installation
B. Plumbing system design and plan review
C. Pipefitting only
D. Mechanical drafting
Answer: B
Rationale: ASSE 5000 focuses on professional-level knowledge in plumbing
engineering design, system analysis, and plan review.
2. Which document is MOST critical when determining minimum pipe sizes?
A. Manufacturer installation manuals
B. Applicable plumbing code
C. Job specifications only
D. Contractor preference
Answer: B
Rationale: Pipe sizing must comply with the adopted plumbing code to ensure
safety and performance.
, 3. Fixture unit values are primarily used to:
A. Determine fixture cost
B. Estimate probable demand on a system
C. Calculate water quality
D. Select pipe materials
Answer: B
Rationale: Fixture units represent load and diversity to size piping systems
accurately.
4. Which system protects potable water from contamination due to backflow?
A. Drainage system
B. Vent system
C. Backflow prevention system
D. Stormwater system
Answer: C
Rationale: Backflow prevention devices stop reverse flow that could
contaminate potable water.
5. A reduced pressure principle backflow preventer is required when:
A. Only backsiphonage exists
B. No hazard is present
C. High health hazard exists
D. Only low hazard exists
Answer: C
Rationale: RP devices are designed for high-hazard cross-connections.
6. Water hammer is primarily caused by:
A. Low flow velocity
B. Sudden valve closure
C. Improper venting
D. Thermal expansion
, Answer: B
Rationale: Rapid stoppage of flowing water creates pressure surges known as
water hammer.
7. Which material is most commonly used for water service piping?
A. Cast iron
B. Copper or plastic (PEX/PE)
C. Steel conduit
D. Galvanized iron only
Answer: B
Rationale: Copper and approved plastics are widely used for durability and
corrosion resistance.
8. The minimum slope for horizontal drainage piping is generally based on:
A. Pipe material
B. Pipe diameter
C. Fixture type
D. Building height
Answer: B
Rationale: Codes specify slope requirements according to pipe size to maintain
scouring velocity.
9. A vent system’s primary function is to:
A. Carry wastewater
B. Protect trap seals
C. Increase water pressure
D. Remove solids
Answer: B
Rationale: Venting prevents siphonage and backpressure, preserving trap seals.
QUALIFICATION STANDARD (PQS) EXAM
QUESTION AND CORRECT
ANSWERS(VERIFIED ANSWERS) PLUS
RATIONALES 2026 Q&A INSTANT
DOWNLOAD PDF
1. The primary purpose of the ASSE 5000 certification is to validate
competency in:
A. Residential plumbing installation
B. Plumbing system design and plan review
C. Pipefitting only
D. Mechanical drafting
Answer: B
Rationale: ASSE 5000 focuses on professional-level knowledge in plumbing
engineering design, system analysis, and plan review.
2. Which document is MOST critical when determining minimum pipe sizes?
A. Manufacturer installation manuals
B. Applicable plumbing code
C. Job specifications only
D. Contractor preference
Answer: B
Rationale: Pipe sizing must comply with the adopted plumbing code to ensure
safety and performance.
, 3. Fixture unit values are primarily used to:
A. Determine fixture cost
B. Estimate probable demand on a system
C. Calculate water quality
D. Select pipe materials
Answer: B
Rationale: Fixture units represent load and diversity to size piping systems
accurately.
4. Which system protects potable water from contamination due to backflow?
A. Drainage system
B. Vent system
C. Backflow prevention system
D. Stormwater system
Answer: C
Rationale: Backflow prevention devices stop reverse flow that could
contaminate potable water.
5. A reduced pressure principle backflow preventer is required when:
A. Only backsiphonage exists
B. No hazard is present
C. High health hazard exists
D. Only low hazard exists
Answer: C
Rationale: RP devices are designed for high-hazard cross-connections.
6. Water hammer is primarily caused by:
A. Low flow velocity
B. Sudden valve closure
C. Improper venting
D. Thermal expansion
, Answer: B
Rationale: Rapid stoppage of flowing water creates pressure surges known as
water hammer.
7. Which material is most commonly used for water service piping?
A. Cast iron
B. Copper or plastic (PEX/PE)
C. Steel conduit
D. Galvanized iron only
Answer: B
Rationale: Copper and approved plastics are widely used for durability and
corrosion resistance.
8. The minimum slope for horizontal drainage piping is generally based on:
A. Pipe material
B. Pipe diameter
C. Fixture type
D. Building height
Answer: B
Rationale: Codes specify slope requirements according to pipe size to maintain
scouring velocity.
9. A vent system’s primary function is to:
A. Carry wastewater
B. Protect trap seals
C. Increase water pressure
D. Remove solids
Answer: B
Rationale: Venting prevents siphonage and backpressure, preserving trap seals.
