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Question 1. Which document defines the scope and intent of the International Plumbing Code (IPC) as applied in Georgia? A) Georgia State Building Code B) International Fuel Gas Code (IFGC) C) International Plumbing Code (IPC) with Georgia Amendments D) OSHA 1926 Regulations Answer: C Explanation: The IPC, together with state-specific amendments, outlines the scope, purpose, and applicability of plumbing regulations in Georgia. Question 2. Before beginning a new plumbing installation, what is the first administrative step required by most jurisdictions? A) Ordering materials B) Obtaining a building permit C) Hiring a licensed plumber D) Scheduling the final inspection Answer: B Explanation: A permit must be secured prior to any construction to ensure compliance with code and to trigger required inspections. Question 3. OSHA standard 29 CFR Part 1926 primarily addresses which of the following? A) Electrical safety in residential homes B) Construction industry safety and health C) Hazardous waste disposal D) Licensing requirements for plumbers Answer: B Explanation: Part 1926 sets safety and health standards for construction work, including plumbing activities on job sites. Question 4. Which material is NOT approved for use in interior water supply piping per the IPC? A) Copper B) CPVC
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C) Galvanized steel D) PEX-a Answer: C Explanation: Galvanized steel is prohibited for interior potable water due to corrosion and lead concerns; copper, CPVC, and PEX-a are approved. Question 5. The required clearance in front of a water closet (toilet) for an ADA-compliant bathroom is: A) 24 inches B) 30 inches C) 36 inches D) 48 inches Answer: B Explanation: ADA mandates a minimum 30-inch clear floor space in front of the water closet to allow wheelchair maneuverability. Question 6. Which fixture must be installed at a minimum height of 48 inches above the finished floor according to the IPC? A) Lavatory sink B) Wall-mounted urinal C) Grab bar D) Hand-held shower head Answer: C Explanation: Grab bars for accessible bathrooms must be installed 33 - to- 36 inches above the floor; however, the question asks for minimum height of 48 inches, which applies to the top of a wall-mounted urinal (not a grab bar). The correct answer is B. (Note: The correct answer is B; the explanation clarifies the requirement.) Question 7. For a commercial kitchen, which type of trap is required to prevent grease from entering the sanitary drainage system? A) P-trap B) S-trap C) Grease trap (oil interceptor)
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Question 11. When sizing a water heater for a residential dwelling, which factor is NOT considered? A) Total fixture unit load B) Desired first-hour rating (FHR) C) Height of the building D) Peak demand hour usage Answer: C Explanation: The building’s height does not affect water heater sizing; demand calculations are based on fixture units and usage patterns. Question 12. The minimum temperature for a water heater’s temperature-pressure (T&P) relief valve setting is: A) 120 °F B) 140 °F C) 160 °F D) 180 °F Answer: B Explanation: The IPC requires T&P valves to open at a minimum of 140 °F to protect against over-temperature conditions. Question 13. In drainage design, one Drainage Fixture Unit (DFU) is equivalent to: A) 1 gallon per minute (gpm) of water flow B) 0.5 gpm of water flow C) 1 psi of pressure D) 2 gpm of water flow Answer: B Explanation: The IPC conversion approximates 1 DFU to 0.5 gpm of water flow for sizing drainage pipes. Question 14. A “wet vent” in a plumbing system is characterized by: A) Carrying only air
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B) Carrying both waste and vent gases in the same pipe C) Being installed only on the roof D) Requiring a separate pipe for each fixture Answer: B Explanation: Wet venting allows a single pipe to serve as both a waste and a vent for certain fixtures, reducing pipe count. Question 15. Which type of vent is required for a kitchen island sink where the vent cannot rise vertically through the cabinet? A) Loop vent B) Island vent (air admittance valve) C) Circuit vent D) Common vent Answer: B Explanation: An island vent, often an air admittance valve, provides venting for fixtures that lack a direct vertical vent path. Question 16. The IPC permits indirect waste connections for which of the following? A) Residential bathroom sinks B) Commercial kitchen dishwashers C) Medical equipment condensate lines D) Landscape irrigation systems Answer: C Explanation: Indirect waste is required for medical equipment to prevent contamination; the waste is routed through a floor drain or air gap. Question 17. A grease trap must be sized to handle at least what percentage of the total flow from a commercial kitchen? A) 5 % B) 10 % C) 15 % D) 20 %
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Question 21. The IFGC defines the maximum allowable pressure drop across a gas regulator as: A) 5 psi B) 10 psi C) 15 psi D) 20 psi Answer: B Explanation: A pressure drop greater than 10 psi can cause uneven gas flow and is not permitted by the IFGC. Question 22. For a gas-fired water heater, the minimum clearance to combustible material on the side of the unit is: A) 1 inch B) 3 inches C) 6 inches D) 12 inches Answer: C Explanation: The IPC requires a minimum of 6 inches of clearance to combustible materials on the sides of gas-fired water heaters. Question 23. In isometric drawing, a 45° offset is represented by which standard line angle? A) 30° from the horizontal B) 45° from the horizontal C) 60° from the horizontal D) 90° from the horizontal Answer: B Explanation: Offsets in isometric sketches are drawn at 45° angles to accurately depict pipe bends in three-dimensional space. Question 24. The volume of water in a 2-inch schedule 40 copper pipe that is 30 feet long is approximately: A) 0.5 gal B) 1.1 gal
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C) 2.0 gal D) 3.5 gal Answer: B Explanation: Using the formula V = π r² L and converting cubic inches to gallons, a 2-inch pipe (inner diameter ≈ 2.067 in) yields about 1.1 gallons. Question 25. Which of the following is the correct method to calculate the pressure head (ft of water) for a static water column of 150 psi? A) Multiply psi by 2. B) Divide psi by 0. C) Multiply psi by 2.31 and then divide by 0. D) Divide psi by 2. Answer: A Explanation: Pressure head (ft) = psi × 2.31. Therefore, 150 psi × 2.31 ≈ 347 ft of water column. Question 26. According to OCGA Title 43, Chapter 14, a licensed plumbing contractor must renew their license every: A) 1 year B) 2 years C) 3 years D) 5 years Answer: B Explanation: Georgia requires plumbing contractors to renew their license biennially (every two years). Question 27. The “Call Before You Dig” law in Georgia (811) requires excavators to: A) Obtain a written permit from the city B) Notify the utility locating service at least 48 hours before digging C) Provide a site map to the utility companies after excavation D) Hire a licensed plumber to supervise the dig Answer: B
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Question 31. When calculating the gas pipe size for a 30,000 BTU/hr furnace located 200 ft from the meter, which factor is most critical? A) Pipe material’s thermal conductivity B) The longest pipe run length C) The number of elbows in the line D) The outdoor temperature Answer: B Explanation: The IFGC sizing tables base pipe diameter on the total BTU demand and the longest continuous run of pipe. Question 32. Which of the following fire-rated floor assemblies requires a fire-stop at the point where a water supply pipe penetrates? A) Non-structural wood joist floor B) Concrete slab on grade C) 2-hour fire-rated gypsum board floor D) Open-deck steel floor Answer: C Explanation: Penetrations through fire-rated assemblies must be sealed with a fire-stop system to maintain the rating; a 2-hour gypsum floor is such an assembly. Question 33. In a plumbing drainage system, a “circuit vent” is used to: A) Provide venting for isolated fixtures only B) Vent multiple fixtures through a single vent pipe that loops back to the stack C) Allow air to enter a water heater tank D) Connect directly to the building’s mechanical ventilation system Answer: B Explanation: Circuit venting uses a single pipe that loops back to the drainage stack, serving multiple fixtures while maintaining proper air pressure. Question 34. The minimum required slope for a 4-inch horizontal sanitary pipe serving a building drain is: A) 0.25 % B) 0.5 %
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C) 0.75 %
D) 1 %
Answer: B Explanation: The IPC sets a minimum slope of 0.5 % (1/4 in per foot) for 4-inch pipe to ensure adequate gravity flow. Question 35. Which of the following is considered a high-hazard situation requiring an RPZ backflow preventer? A) Residential garden irrigation B) Public swimming pool water supply C) Industrial chemical processing water line D) Office building restroom supply Answer: C Explanation: Industrial chemical processing involves hazardous substances; an RPZ offers the highest level of protection against backflow. Question 36. A “double-check valve assembly” (DCVA) provides protection against which type of backflow? A) Backpressure only B) Back-siphonage only C) Both backpressure and back-siphonage, low-hazard level D) High-hazard cross-connections Answer: C Explanation: DCVAs protect against both backpressure and backsiphonage but are limited to low-hazard applications. Question 37. In a commercial kitchen, the minimum size for a floor drain serving a 6-ft² grease interceptor is: A) 2-inch diameter B) 3-inch diameter C) 4-inch diameter D) 6-inch diameter Answer: C
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Question 41. Which of the following is the correct method to calculate pipe weight for a 10-ft length of 3-inch schedule 40 PVC pipe? A) Multiply length by pipe’s unit weight per foot (≈ 5 lb/ft) B) Use the formula: weight = π × (D – 2t)² × L × density of PVC C) Look up the weight in the IPC Table 6-2 for PVC D) All of the above methods give the same result Answer: D Explanation: All three approaches are valid; the IPC provides unit weights, and the formula yields the same value when correct dimensions are used. Question 42. The most common method for joining copper water supply pipe in a residential system is: A) Soldered (sweat) joint B) Press-fit fitting C) Threaded connection D) Push-fit (shrink-fit) connector Answer: A Explanation: Soldered (sweat) joints are the traditional and widely accepted method for copper pipe connections in residential plumbing. Question 43. In a multi-story building, the main building drain must be sized to handle at least: A) 200 DFU B) 300 DFU C) 400 DFU D) 500 DFU Answer: C Explanation: The IPC requires the main building drain to be sized for a minimum of 400 Drainage Fixture Units to accommodate typical multi-story loads. Question 44. The required minimum clearance between a lavatory sink and an adjacent wall in a public restroom is: A) 6 inches B) 12 inches
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C) 18 inches D) 24 inches Answer: B Explanation: A 12-inch clearance provides sufficient space for cleaning and accessibility around the lavatory. Question 45. Which of the following best describes a “saw-tooth” roof drainage arrangement? A) Parallel gutters running along the ridge B) Alternating downspouts placed at regular intervals C) A series of sloped roof sections directing water to multiple collection points D) A single large collector at the low point of the roof Answer: C Explanation: Saw-tooth roofs have alternating slopes that channel water to several collection points, reducing runoff intensity. Question 46. For a gas line serving a 50,000 BTU/hr water heater, the IFGC sizing table indicates a minimum pipe size of: A) ½-inch B) ¾-inch C) 1-inch D) 1-¼-inch Answer: B Explanation: According to IFGC Table 302.5, a ¾-inch gas pipe is the minimum size for a 50,000 BTU/hr demand over a typical run length. Question 47. A “slope” of 1 % in a drainage pipe is equivalent to: A) 1 inch drop per foot of run B) 1 mm drop per meter of run C) 1 inch drop per 8 feet of run D) 1 inch drop per 12 feet of run Answer: D
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Question 51. The required minimum distance between a water heater and a combustible wall is: A) 1 inch B) 3 inches C) 6 inches D) 12 inches Answer: C Explanation: The IPC mandates at least 6 inches of clearance from combustible materials to prevent fire hazards. Question 52. Which of the following statements about “pressure-reducing valves” (PRVs) is true? A) They must be installed downstream of the water meter B) They are only required for fire sprinkler systems C) They cannot be used on residential water service lines D) They must be set to a maximum of 80 psi Answer: A Explanation: PRVs are installed after the water meter to reduce incoming pressure to a safe level for the building’s plumbing system. Question 53. When designing a storm drainage system, the term “secondary drainage” refers to: A) The primary roof gutter system B) A backup overflow pipe that activates during heavy rain C) The underground pipe network that conveys water to the municipal sewer D) A decorative landscape drainage feature Answer: B Explanation: Secondary drainage provides an alternate path for excess water when the primary system exceeds capacity. Question 54. The minimum pipe diameter for a gas-fired commercial dryer vent is: A) 2 inches B) 3 inches
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C) 4 inches D) 6 inches Answer: B Explanation: The IFGC requires a minimum of 3-inch diameter for venting gas-fired dryers to ensure adequate flue gas flow. Question 55. Which of the following is NOT a required component of a fire-stop system for a pipe penetration? A) Fire-resistive sealant B) Insulating wrap around the pipe C) Approved fire-stop collar D) Intumescent material Answer: B Explanation: Insulating wrap is not a mandatory part of a fire-stop; the other components are required to maintain fire-rating integrity. Question 56. In a plumbing layout, a “wet vent” can serve which combination of fixtures? A) Only a sink and a bathtub B) A lavatory and a water closet on the same branch C) A kitchen sink and a dishwasher only D) Any number of fixtures as long as the total DFU does not exceed 5 Answer: B Explanation: Wet venting permits a lavatory and a water closet to share a common vent pipe, provided the total DFU complies with the code. Question 57. The Georgia amendment to the IPC requires that all underground water service lines be: A) Polyethylene (PE) with a minimum wall thickness of 0.125 in B) Copper with a minimum schedule 40 wall thickness C) Dressed with a minimum 6-inch of sand cover D) Marked with a green tape at the surface Answer: D
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Question 61. Which of the following is the correct definition of “fixture unit” for gas piping? A) A measure of pressure loss per foot of pipe B) A numerical value representing the gas demand of a specific appliance C) The diameter of the gas pipe needed for a fixture D) The flow velocity of gas through a pipe Answer: B Explanation: Gas fixture units quantify the gas demand of appliances, allowing designers to size gas piping appropriately. Question 62. According to the IFGC, the maximum allowable length of a CSST (corrugated stainless steel tubing) run without a mechanical protector is: A) 20 ft B) 30 ft C) 40 ft D) 50 ft Answer: B Explanation: CSST must be protected by a mechanical protector when the run exceeds 30 ft to prevent damage. Question 63. In a commercial building, the required minimum number of cleanouts for a 200-ft branch drain is: A) One cleanout per 50 ft B) One cleanout per 75 ft C) One cleanout per 100 ft D) One cleanout per 150 ft Answer: C Explanation: The IPC requires a cleanout for every 100 ft of horizontal drainage pipe to facilitate maintenance. Question 64. The term “thermal expansion” in a water heating system refers to: A) Increase in pipe diameter due to heat
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B) Increase in water volume when heated C) Increase in water pressure from pump operation D) Decrease in water temperature during standby Answer: B Explanation: Water expands in volume when heated, creating pressure changes that must be accommodated by expansion tanks or other devices. Question 65. Which of the following is a required feature of a commercial eye-wash station according to the IPC? A) Minimum flow rate of 0.5 gpm per eye cup B) Temperature of water not exceeding 100 °F C) Must be located within 10 ft of the hazard area D) Must have a continuous flow for at least 15 minutes Answer: C Explanation: Eye-wash stations must be installed within 10 feet of the hazardous area to provide immediate decontamination. Question 66. The IPC defines “maximum allowable water temperature” for a residential water heater setpoint as: A) 120 °F B) 130 °F C) 140 °F D) 150 °F Answer: C Explanation: To prevent scalding, the code limits the maximum temperature setting of residential water heaters to 140 °F. Question 67. Which calculation is used to determine the required size of a vent pipe for a 4-inch drainage stack serving 150 DFU? A) Multiply DFU by 0.25 to obtain pipe diameter in inches B Use Table 708.2 in the IPC to select pipe size based on DFU C) Add 1 inch to the stack diameter for each 50 DFU D) Use the same diameter as the stack (4-inch) regardless of DFU
