Plumbing Contractor Licensing Exam
Practice with Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which document legally authorizes a plumbing contractor to
operate a business?
A. Trade certificate
B. Journeyman card
C. Contractor license
D. Work permit
Rationale: A contractor license grants legal authority to perform
plumbing work as a business.
2. Which insurance protects a plumbing contractor from third-party
injury claims?
A. Workers’ compensation
B. Vehicle insurance
C. General liability insurance
D. Property insurance
Rationale: General liability covers bodily injury and property damage
claims.
3. A plumbing contractor is primarily responsible for ensuring
compliance with which codes?
A. Electrical code only
,B. Fire code only
C. Plumbing and building codes
D. Zoning code only
Rationale: Plumbing contractors must follow applicable plumbing and
building codes.
4. What is the minimum slope typically required for horizontal
drainage piping?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. Level
Rationale: Standard drainage slope is 1/4 inch per foot to ensure proper
flow.
5. Which fitting is used to connect pipes of different diameters?
A. Elbow
B. Tee
C. Coupling
D. Reducer
Rationale: A reducer allows transition between different pipe sizes.
6. Which material is commonly approved for residential water supply
lines?
A. Clay
B. PEX
C. Cast iron
, D. Concrete
Rationale: PEX is widely approved for residential water distribution.
7. Who is responsible for obtaining plumbing permits on a project?
A. Inspector
B. Property owner only
C. Plumbing contractor
D. Supplier
Rationale: Contractors are typically responsible for securing permits.
8. Which device prevents contaminated water from flowing back into
potable water?
A. Shutoff valve
B. Pressure regulator
C. Backflow preventer
D. Air chamber
Rationale: Backflow preventers protect potable water from
contamination.
9. What type of valve is best for quick shutoff with minimal pressure
loss?
A. Gate valve
B. Globe valve
C. Ball valve
D. Needle valve
Rationale: Ball valves allow fast shutoff and minimal flow restriction.
Practice with Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which document legally authorizes a plumbing contractor to
operate a business?
A. Trade certificate
B. Journeyman card
C. Contractor license
D. Work permit
Rationale: A contractor license grants legal authority to perform
plumbing work as a business.
2. Which insurance protects a plumbing contractor from third-party
injury claims?
A. Workers’ compensation
B. Vehicle insurance
C. General liability insurance
D. Property insurance
Rationale: General liability covers bodily injury and property damage
claims.
3. A plumbing contractor is primarily responsible for ensuring
compliance with which codes?
A. Electrical code only
,B. Fire code only
C. Plumbing and building codes
D. Zoning code only
Rationale: Plumbing contractors must follow applicable plumbing and
building codes.
4. What is the minimum slope typically required for horizontal
drainage piping?
A. 1/16 inch per foot
B. 1/4 inch per foot
C. 1 inch per foot
D. Level
Rationale: Standard drainage slope is 1/4 inch per foot to ensure proper
flow.
5. Which fitting is used to connect pipes of different diameters?
A. Elbow
B. Tee
C. Coupling
D. Reducer
Rationale: A reducer allows transition between different pipe sizes.
6. Which material is commonly approved for residential water supply
lines?
A. Clay
B. PEX
C. Cast iron
, D. Concrete
Rationale: PEX is widely approved for residential water distribution.
7. Who is responsible for obtaining plumbing permits on a project?
A. Inspector
B. Property owner only
C. Plumbing contractor
D. Supplier
Rationale: Contractors are typically responsible for securing permits.
8. Which device prevents contaminated water from flowing back into
potable water?
A. Shutoff valve
B. Pressure regulator
C. Backflow preventer
D. Air chamber
Rationale: Backflow preventers protect potable water from
contamination.
9. What type of valve is best for quick shutoff with minimal pressure
loss?
A. Gate valve
B. Globe valve
C. Ball valve
D. Needle valve
Rationale: Ball valves allow fast shutoff and minimal flow restriction.
