Master / Plumbing Inspector) 2026-2027
Frequently Tested Exam Questions With
Verified Multiple Choice and Conceptual
Actual 100% Correct Detailed Answers
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1. Which chemical substance prevents oxides from forming on freshly cleaned
copper before soldering or brazing?
A. Solvent
B. Primer
C. Flux
D. Adhesive
Answer: C. Flux
2. Where is an escutcheon ring used?
A. Inside the wall cavity
B. At the valve body
C. Around the fixture outlet
D. On the outside of the stub-out pipe
Answer: D
3. A waste pipe that discharges into and through an approved open connection
is called:
,A. Direct waste pipe
B. Soil pipe
C. Indirect waste pipe
D. Branch drain
Answer: C
4. Which two trap parts are used to measure the depth of the trap seal?
A. Trap inlet and outlet
B. Crown weir and top of the dip
C. Trap arm and vent
D. Overflow and tailpiece
Answer: B
5. A vent connecting one or more individual vents to a vent stack is a:
A. Circuit vent
B. Relief vent
C. Branch vent
D. Loop vent
Answer: C
6. A pipe that makes an angle greater than 45 degrees from horizontal is
considered:
A. Horizontal pipe
B. Diagonal pipe
C. Vertical pipe
D. Offset pipe
Answer: C
, 7. A waste system using threaded rigid piping with recessed drainage fittings is
known as:
A. Cast iron system
B. Combination system
C. Durham system
D. DWV system
Answer: C
8. What type of faucet is installed to drain water from the bottom of a water
heater?
A. Hose bibb
B. Stop valve
C. Boiler drain
D. Angle valve
Answer: C
9. Who lists the approved standards for gas-fired storage water heaters?
A. ANSI
B. NFPA
C. ASME
D. OSHA
Answer: C
10. Before mechanical backfilling, trenches must be hand-filled to how many
inches above the pipe crown?
A. 6 inches
B. 12 inches
C. 18 inches