Master Plumber Licensing Examination
(AGACNP-C) 2026–2027 |
Comprehensive Question Practice Test
with Answers & Rationales| Free Pdf
Access
1. What is the primary responsibility of a licensed master plumber?
A. Design, install, inspect, repair, and supervise plumbing systems in compliance with
applicable plumbing codes
B. Install roofing systems only
C. Perform electrical wiring exclusively
D. Repair automotive engines
Correct Answer: A
Rationale: A master plumber is responsible for ensuring plumbing systems are safe, code-
compliant, and properly installed and maintained.
2. Which permit is generally required before installing a new plumbing
system?
A. Plumbing permit
B. Parking permit
,C. Driver's licence
D. Occupancy permit
Correct Answer: A
Rationale: A plumbing permit authorises plumbing work after review for code compliance.
3. Which pipe material is commonly used for residential water supply
systems?
A. PEX tubing
B. Corrugated steel pipe
C. Clay pipe
D. Concrete pipe
Correct Answer: A
Rationale: PEX is flexible, corrosion-resistant, and widely used for potable water systems.
4. Which plumbing component prevents contaminated water from flowing
back into the potable water supply?
A. Backflow preventer
B. Ball valve
C. Gate valve
D. Pressure gauge
Correct Answer: A
Rationale: Backflow preventers protect drinking water from contamination caused by
reverse flow.
,5. Which fixture requires a trap to prevent sewer gases from entering the
building?
A. Sink
B. Water heater
C. Pressure tank
D. Expansion tank
Correct Answer: A
Rationale: Traps maintain a water seal that blocks sewer gases.
6. What is the primary function of a plumbing vent system?
A. Equalise pressure and remove sewer gases
B. Increase water pressure
C. Heat the water
D. Filter drinking water
Correct Answer: A
Rationale: Vent systems allow proper drainage by balancing air pressure and safely
venting sewer gases.
7. Which pipe is commonly used for sanitary drainage systems?
A. PVC pipe
B. Copper tubing
C. Stainless steel tubing
D. Brass pipe
, Correct Answer: A
Rationale: PVC is durable, corrosion-resistant, and commonly used for drain, waste, and
vent (DWV) systems.
8. Which plumbing valve is primarily used to completely stop or allow water
flow?
A. Gate valve
B. Pressure relief valve
C. Check valve
D. Float valve
Correct Answer: A
Rationale: Gate valves are designed for full open or full closed operation.
9. Which plumbing fitting connects two pipes in a straight line?
A. Coupling
B. Tee
C. Elbow
D. Wye
Correct Answer: A
Rationale: Couplings join two pipes of the same diameter.
10. Which device protects a water heater from excessive pressure?
A. Temperature and Pressure (T&P) relief valve
B. Ball valve
(AGACNP-C) 2026–2027 |
Comprehensive Question Practice Test
with Answers & Rationales| Free Pdf
Access
1. What is the primary responsibility of a licensed master plumber?
A. Design, install, inspect, repair, and supervise plumbing systems in compliance with
applicable plumbing codes
B. Install roofing systems only
C. Perform electrical wiring exclusively
D. Repair automotive engines
Correct Answer: A
Rationale: A master plumber is responsible for ensuring plumbing systems are safe, code-
compliant, and properly installed and maintained.
2. Which permit is generally required before installing a new plumbing
system?
A. Plumbing permit
B. Parking permit
,C. Driver's licence
D. Occupancy permit
Correct Answer: A
Rationale: A plumbing permit authorises plumbing work after review for code compliance.
3. Which pipe material is commonly used for residential water supply
systems?
A. PEX tubing
B. Corrugated steel pipe
C. Clay pipe
D. Concrete pipe
Correct Answer: A
Rationale: PEX is flexible, corrosion-resistant, and widely used for potable water systems.
4. Which plumbing component prevents contaminated water from flowing
back into the potable water supply?
A. Backflow preventer
B. Ball valve
C. Gate valve
D. Pressure gauge
Correct Answer: A
Rationale: Backflow preventers protect drinking water from contamination caused by
reverse flow.
,5. Which fixture requires a trap to prevent sewer gases from entering the
building?
A. Sink
B. Water heater
C. Pressure tank
D. Expansion tank
Correct Answer: A
Rationale: Traps maintain a water seal that blocks sewer gases.
6. What is the primary function of a plumbing vent system?
A. Equalise pressure and remove sewer gases
B. Increase water pressure
C. Heat the water
D. Filter drinking water
Correct Answer: A
Rationale: Vent systems allow proper drainage by balancing air pressure and safely
venting sewer gases.
7. Which pipe is commonly used for sanitary drainage systems?
A. PVC pipe
B. Copper tubing
C. Stainless steel tubing
D. Brass pipe
, Correct Answer: A
Rationale: PVC is durable, corrosion-resistant, and commonly used for drain, waste, and
vent (DWV) systems.
8. Which plumbing valve is primarily used to completely stop or allow water
flow?
A. Gate valve
B. Pressure relief valve
C. Check valve
D. Float valve
Correct Answer: A
Rationale: Gate valves are designed for full open or full closed operation.
9. Which plumbing fitting connects two pipes in a straight line?
A. Coupling
B. Tee
C. Elbow
D. Wye
Correct Answer: A
Rationale: Couplings join two pipes of the same diameter.
10. Which device protects a water heater from excessive pressure?
A. Temperature and Pressure (T&P) relief valve
B. Ball valve
