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Question 1. Which of the following definitions best describes a “Master Plumber” under Virginia DPOR regulations? A) An individual who has completed an apprenticeship and holds a journeyman license. B) A person who has obtained a master plumber license and is authorized to supervise all plumbing work. C) Any plumber who has been employed for at least five years in the trade. D) A contractor who owns a plumbing business but does not perform work personally. Answer: B Explanation: Virginia defines a Master Plumber as a licensed individual who has met education, experience, and examination requirements and may supervise and approve all plumbing work. Question 2. A licensed plumber changes his residential address. What is the required action regarding his license? A) Nothing; address changes are not reported. B) Notify the Board within 30 days and update the license display. C) Submit a new application for a different license class. D) Only update the address on the Board’s website. Answer: B Explanation: Virginia law requires licensees to notify the Board of any change in address or name within 30 days and to display the updated license at the work site. Question 3. Which of the following is a prohibited act that can result in revocation of a Virginia plumbing license? A) Using a different brand of pipe than specified in the contract. B) Performing work without a written permit when required. C) Charging a discount for early payment. D) Referring a customer to another contractor. Answer: B
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Explanation: Performing work without a required permit is a violation of the DPOR regulations and can lead to disciplinary action, including revocation. Question 4. The International Plumbing Code (2021) is applied in Virginia to: A) Only new construction. B) Only renovations of existing systems. C) Both new installations and alterations of existing systems. D) Only commercial buildings. Answer: C Explanation: The IPC governs both new construction and alterations/repairs of existing plumbing systems unless a local amendment states otherwise. Question 5. When a plumbing permit is required for a water service installation, which document must accompany the permit application? A) A notarized affidavit of ownership. B) Detailed construction drawings showing pipe sizes and layout. C) A copy of the contractor’s business license. D) A site safety plan. Answer: B Explanation: The permit application must include construction documents that illustrate the proposed piping system, including sizes, materials, and routing. Question 6. Which of the following is the correct minimum slope for a horizontal 3 - inch DWV branch pipe serving a single fixture? A) 1/8 inch per foot B) 1/4 inch per foot C) 1/2 inch per foot D) 1 inch per foot Answer: B Explanation: The IPC requires a minimum slope of 1/4 inch per foot for horizontal DWV pipes 3 inches or larger.
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Question 10. The minimum fixture count for a public restroom serving a 150 - person assembly area is: A) 5 water closets B) 10 water closets C) 15 water closets D) 20 water closets Answer: B Explanation: According to the IPC, a public restroom serving 150 occupants requires at least 10 water closets (one per 15 occupants). Question 11. Which of the following is required for an ADA-compliant lavatory? A) A minimum of 30 inches of clear floor space in front of the fixture. B) A faucet that turns on with a single lever only. C) A wall-mounted mirror at a height of 48 inches. D) A toilet paper dispenser located 24 inches from the bowl. Answer: A Explanation: ADA requires at least 30 inches of clear floor space in front of a lavatory to accommodate wheelchair maneuvering. Question 12. In a commercial kitchen, the correct method for preventing backflow from a dishwasher is: A) Installing a double-check valve on the supply line. B) Providing an air gap of at least 1 inch above the sink rim. C) Using a pressure-reducing valve downstream of the dishwasher. D) Installing a vacuum breaker on the drain line. Answer: B Explanation: An air gap of at least 1 inch between the dishwasher’s discharge outlet and the sink rim prevents backflow contamination. Question 13. The maximum allowable length of a vent pipe without a vent cap, when serving a 3-inch branch, is:
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A) 6 feet B) 8 feet C) 10 feet D) 12 feet Answer: B Explanation: The IPC permits a vent pipe up to 8 feet in length without a vent cap for a 3-inch vent, provided the pipe is not obstructed. Question 14. Which of the following trap configurations is prohibited by the IPC? A) P-trap with a 2-inch inlet. B) S-trap. C) Bottle trap. D) Drum trap. Answer: B Explanation: S-traps are prohibited because they can lose their seal due to siphonage. Question 15. A grease interceptor for a restaurant must be sized to handle: A) 5 gallons per minute of water flow. B) 2 percent of the total flow rate of the fixture units served. C) 500 gallons per hour. D) 100 percent of the total fixture unit load. Answer: B Explanation: The IPC requires grease interceptors to be sized at a minimum of 2 percent of the total flow rate of the fixtures they serve. Question 16. The required distance between a vent termination on a roof and the nearest opening (window or intake) is: A) 5 feet B) 10 feet
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B) 3 inches C) 4 inches D) 5 inches Answer: B Explanation: Using the Rational Method, the required flow is 4,000 sq ft × 2 in/hr ÷ 96 = 83.3 gpm. A 3-inch PVC pipe can handle up to ~90 gpm, meeting the requirement. Question 20. An air-admittance valve (AAV) may be used in a vent system when: A) The building is located in a high-altitude area. B) The vent terminates above the roof. C) The code permits its use for individual fixtures and the total load does not exceed the valve’s rating. D) The pipe material is copper. Answer: C Explanation: AAVs are allowed for individual fixtures where a traditional vent is impractical, provided the valve’s capacity matches the fixture load. Question 21. The correct method for protecting underground water supply lines from freezing in Virginia’s climate zones is: A) Insulating the pipe with foam sleeves only. B) Using heat-trace cables in addition to insulation. C) Installing the pipe at a minimum depth of 12 inches. D) Painting the pipe with anti-freeze coating. Answer: B Explanation: In colder zones, heat-trace combined with insulation is required to prevent freezing of water lines. Question 22. Which of the following statements about pipe bedding is true? A) Bedding material must be a minimum of 2 inches thick for all pipe sizes.
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B) Sand bedding is acceptable for both support and backfill without a protective plate. C) A protective plate must be placed under the pipe when using sand bedding. D) Bedding is optional for PVC piping. Answer: C Explanation: When sand is used as bedding, a protective plate must be installed beneath the pipe to prevent point loading. Question 23. The maximum allowable pressure for a CPVC water-distribution system is: A) 100 psi at 73 °F B) 150 psi at 73 °F C) 200 psi at 73 °F D) 250 psi at 73 °F Answer: C Explanation: CPVC is rated for 200 psi at 73 °F for hot-water distribution per ASTM standards. Question 24. In a sanitary drainage system, the purpose of a “cleanout” is to: A) Provide a vent for the branch pipe. B) Allow access for removal of blockages. C) Reduce water hammer. D) Increase flow velocity. Answer: B Explanation: Cleanouts are installed at strategic locations to permit manual clearing of obstructions in the DWV system. Question 25. Which of the following is a required feature for a vented roof-penetration assembly? A) A flashing that is sealed with silicone only. B) A vent cap that prevents rain entry while allowing airflow.
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D) Welding. Answer: B Explanation: PEX is joined using crimp, clamp, or push-fit fittings; soldering, threading, or welding are not compatible. Question 29. The required minimum clearance between a water-heater and combustible material is: A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: B Explanation: The IPC mandates a minimum of 12 inches clearance from the side, top, or back of a water heater to any combustible surface. Question 30. A building’s DWV system must be tested for pressure before final approval. The required test pressure for a 4-inch building drain is: A) 5 psi B) 10 psi C) 15 psi D) 20 psi Answer: B Explanation: The IPC requires a 10 psi hydrostatic pressure test for building drains of 4 inches or larger. Question 31. Which of the following is true regarding the installation of a pressure-reducing valve (PRV) on a municipal water supply? A) The PRV must be installed downstream of the water heater. B) The PRV must be installed on the supply side of the building’s main shut-off valve. C) The PRV can be installed anywhere in the system as long as it is accessible.
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D) PRVs are not required if the incoming pressure is below 80 psi. Answer: B Explanation: The PRV must be installed upstream of the building’s main shut-off to protect the entire plumbing system. Question 32. The minimum number of water closets required in a men’s public restroom serving 300 occupants is: A) 10 B) 12 C) 15 D) 18 Answer: C Explanation: The code requires one water closet per 15 male occupants; 300 ÷ 15 = 20, but at least 15 are required for public facilities. Question 33. Which type of vent is permitted to serve a single fixture located more than 6 feet from the nearest stack vent? A) Wet vent B) Air-admittance valve (AAV) C) Circuit vent D) Common vent Answer: B Explanation: AAVs can be used when a traditional vent cannot be run within the required distance, provided the valve’s capacity matches the fixture load. Question 34. The correct method for protecting a pipe that passes through a fire-rated wall assembly is: A) Drilling a larger hole and filling with fire-stop mortar. B) Using a listed pipe sleeve with appropriate fire-stop material. C) Installing the pipe without any fire-stop because metal is non-combustible. D) Applying intumescent paint on the pipe exterior.
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Explanation: The IPC mandates that vent terminals extend at least 12 inches above the roof surface to prevent blockage. Question 38. Which of the following is an acceptable method for providing a water-hammer arrestor for a recirculating hot-water system? A) Installing a ½-inch arrestor on the supply line. B) Installing a ¾-inch arrestor on the return line. C) Installing a 1-inch arrestor on the main supply line. D) No arrestor is needed for recirculating systems. Answer: C Explanation: The arrestor must be sized to the largest pipe in the system; a 1-inch arrestor on the main supply is appropriate. Question 39. The purpose of a “wet vent” is to: A) Provide a vent for a drainage system while also serving as a water supply line. B) Allow a drain line to also function as a vent for other fixtures. C) Supply compressed air to a fire-sprinkler system. D) Connect a toilet directly to the sewer without a vent. Answer: B Explanation: A wet vent allows a single pipe to serve both as a drain for one fixture and as a vent for another. Question 40. Which of the following is a required feature for a residential water-heater’s T&P relief valve discharge pipe? A) It must be ¾-inch copper and extend at least 6 inches above the floor. B) It must be ½-inch PVC and terminate inside the building. C) It must be made of any material and may terminate at any point. D) It must be 1-inch galvanized steel and loop back into the tank. Answer: A
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Explanation: The discharge pipe must be ¾-inch copper (or listed material), extend a minimum of 6 inches above the floor, and terminate outdoors or in a safe location. Question 41. In a commercial building, the required minimum number of floor drains for a 2,000 sq ft kitchen is: A) 1 B) 2 C) 3 D) 4 Answer: B Explanation: The IPC requires at least one floor drain per 1,000 sq ft of kitchen area; thus, a 2,000 sq ft kitchen needs a minimum of two. Question 42. When installing a PEX water line under a slab, the pipe must be protected from: A) UV radiation. B) Mechanical damage using a protective sleeve or conduit. C) High temperatures above 140 °F. D) All of the above. Answer: B Explanation: Under-slab PEX must be protected from mechanical damage; UV radiation is not a concern underground, and PEX can handle temperatures up to 200 °F. Question 43. The minimum slope for a 4-inch building drain is: A) 1/8 inch per foot B) 1/4 inch per foot C) 1/2 inch per foot D) 1 inch per foot Answer: B
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Question 47. Which of the following is the correct method for testing a water-supply system for leaks after installation? A) Visual inspection only. B) Pressurizing the system to 150 % of the design pressure and holding for 15 minutes. C) Pressurizing the system to the design pressure and checking for a pressure drop over 30 minutes. D) Using a dye test. Answer: C Explanation: The IPC requires a pressure test at the design pressure, holding for a specified time (usually 30 minutes) and observing any pressure loss. Question 48. The minimum required diameter for a vent serving a 2-inch DWV branch with a total fixture load of 60 DFU is: A) 1 inch B) 1-¼ inch C) 1-½ inch D) 2 inch Answer: C Explanation: The vent sizing chart shows that a 1-½-inch vent can serve up to 100 DFU; therefore, it is sufficient for a 60 DFU load. Question 49. When installing a water-heater in a confined space, the required ventilation must provide: A) At least 50 CFM of fresh air per 1,000 BTU/hr of input. B) No ventilation if the heater is electric. C) Only a small opening for combustion gases. D) A dedicated mechanical exhaust fan. Answer: A
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Explanation: For gas-fired water heaters, the code requires a minimum of 50 CFM of fresh air per 1,000 BTU/hr of input to ensure proper combustion. Question 50. The correct procedure for installing a backflow preventer in a fire-sprinkler system is: A) Install it downstream of the sprinkler heads. B) Install it on the supply side before any fire-sprinkler valves. C) Install it only on the domestic water side, not on the sprinkler side. D) No backflow preventer is allowed in sprinkler systems. Answer: B Explanation: Backflow preventers for sprinkler systems must be installed on the supply side, upstream of sprinkler valves, to protect the potable water supply. Question 51. Which of the following is a required feature for a pipe that passes through a concrete slab? A) The pipe must be insulated with foam. B) The pipe must be encased in a protective sleeve at least 2 inches larger than the pipe diameter. C) The pipe must be made of steel. D) No special protection is needed. Answer: B Explanation: The code requires a protective sleeve for pipes penetrating concrete slabs to prevent damage and allow movement. Question 52. The minimum number of water closets required in a women’s restroom serving 250 occupants is: A) 12 B) 15 C) 18 D) 20 Answer: C
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Explanation: The code mandates a 12-inch clearance from the sides of a water heater to any combustible material. Question 56. For a 4-inch DWV pipe, the maximum allowable length between cleanouts is: A) 75 feet B) 100 feet C) 125 feet D) 150 feet Answer: B Explanation: The IPC limits cleanout spacing for 4-inch DWV to a maximum of 100 feet. Question 57. Which of the following is true regarding the use of a “double-check valve” (DCV) in a low-hazard backflow situation? A) It must be installed on the main water service line. B) It provides protection against both back-pressure and back-siphonage. C) It is only suitable for fire-sprinkler systems. D) It can be replaced with an air gap in all cases. Answer: B Explanation: A DCV protects against both back-pressure and back-siphonage in low-hazard applications. Question 58. The minimum required diameter for a vent serving a 3-inch DWV branch with a total DFU of 90 is: A) 1-inch B) 1-¼ inch C) 1-½ inch D) 2 inch Answer: D
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Explanation: According to vent sizing tables, a 2-inch vent is required for a 90 DFU load on a 3-inch branch. Question 59. When installing a P-trap for a tub, the minimum trap seal depth required is: A) 0.5 inch B) 1 inch C) 1.5 inch D) 2 inch Answer: B Explanation: The IPC requires a minimum trap seal of 1 inch for P-traps serving bathtubs. Question 60. The correct method for protecting a pipe that passes through a fire-rated wall is: A) Use a metal pipe sleeve and fire-stop sealant approved for the wall rating. B) Drill a larger hole and fill with concrete. C) Install the pipe without any protection because metal does not burn. D) Apply intumescent paint to the pipe exterior. Answer: A Explanation: A listed sleeve with appropriate fire-stop material maintains the integrity of the fire-rated assembly. Question 61. The required minimum pipe size for a water service line to a single-family dwelling with a design flow of 12 gpm is: A) ½ inch B) ¾ inch C) 1 inch D) 1-¼ inch Answer: B
