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Ultimate Exam
Question 1. Which South Dakota administrative authority issues plumbing permits for new residential construction? A) South Dakota Department of Health B) State Plumbing Commission C) Local Building Official D) South Dakota Water Resources Board Answer: C Explanation: In South Dakota, the local building official (often the city or county building department) is responsible for issuing plumbing permits and conducting inspections. Question 2. Under South Dakota rule ARSD 20:53, what is the maximum number of apprentices allowed per journeyman on a residential plumbing project? A) 1 apprentice per journeyman B) 2 apprentices per journeyman C) 3 apprentices per journeyman D) No limit as long as supervision is documented Answer: B Explanation: ARSD 20:53 specifies a ratio of two apprentices to one journeyman for residential work to ensure adequate supervision. Question 3. A 3rd‑year apprentice in South Dakota may perform which of the following without direct journeyman supervision? A) Install gas‑fed water heaters B) Test drainage systems with air pressure C) Connect copper supply lines to a main service line D) Perform final inspection of a commercial kitchen vent Answer: B
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Explanation: South Dakota permits apprentices in their third or fourth year to conduct testing of drainage and vent systems using air pressure, provided they have been trained. Question 4. Which test is specifically allowed by South Dakota code for verifying the integrity of a vent pipe? A) Smoke test using non‑toxic smoke pellets B) Peppermint oil test with 2 oz of oil C) Hydrostatic pressure test at 150 psi D) Ultrasonic leak detection Answer: B Explanation: South Dakota’s amendment allows a peppermint oil test using exactly 2 oz of peppermint oil to detect leaks in vent piping. Question 5. When a pipe passes through a concrete slab, which protection method is required by the UPC as adopted in South Dakota? A) Polyethylene sleeves with 1‑inch clearance B) Rigid metal conduit with a minimum ¼‑inch gap C) Insulated wrap rated for freeze protection D) No protection is required if the pipe is PVC Answer: C Explanation: The UPC requires freeze protection for piping through concrete; insulated wrap meeting the code’s thermal resistance is the accepted method. Question 6. What is the minimum slope required for a horizontal 3‑inch DWV pipe according to the UPC? A) 1/8 inch per foot B) 1/4 inch per foot
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Question 9. What is the “take‑out” distance for a ½‑inch copper soldered tee when installing a faucet? A) 0.5 inches B) 0.75 inches C) 1 inch D) 1.25 inches Answer: B Explanation: The UPC specifies a minimum “take‑out” (distance from the valve seat to the tee center) of ¾ inch for ½‑inch copper fittings. Question 10. Which fixture is prohibited from being installed in a bathroom according to South Dakota’s minimum standards? A) Wall‑mounted urinal B) Floor‑standing bathtub with a built‑in heater C) Self‑cleaning toilet with a flush‑assist button D) Any fixture lacking a backflow preventer Answer: D Explanation: The state’s minimum standards forbid fixtures that could allow backflow contamination; a fixture without a backflow preventer is prohibited. Question 11. The required maximum distance between two water closets in a single‑stall restroom is: A) 30 inches center‑to‑center B) 36 inches center‑to‑center C) 48 inches center‑to‑center D) 60 inches center‑to‑center
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Answer: B Explanation: The UPC sets a 36‑inch minimum center‑to‑center spacing for water closets to provide adequate clearance. Question 12. According to ADA requirements adopted in South Dakota, the clear floor space in front of a lavatory must be at least: A) 30 inches wide B) 36 inches wide C) 48 inches wide D) 60 inches wide Answer: B Explanation: ADA standards require a minimum 36‑inch clear floor space to allow wheelchair maneuvering at a lavatory. Question 13. A kitchen sink faucet has a Water Supply Fixture Unit (WSFU) value of 2.0. How many WSFU does a standard bathtub faucet contribute? A) 1. B) 1. C) 2. D) 2. Answer: B Explanation: The UPC assigns a WSFU of 1.5 to a bathtub faucet, reflecting its lower flow demand compared to a kitchen sink. Question 14. Which material is NOT approved for underground water supply piping in South Dakota? A) PEX‑AL‑PEX (PEX‑a)
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Question 17. When sizing a water service line using Hunter’s Curve, a 3‑family dwelling with a total demand of 25 WSFU requires a minimum pipe size of: A) ¾‑inch B) 1‑inch C) 1¼‑inch D) 1½‑inch Answer: B Explanation: Hunter’s Curve indicates that a demand of 25 WSFU falls within the capacity of a 1 ‑inch copper or PEX service line. Question 18. For a horizontal branch drain serving a bathtub (DFU = 2), what is the minimum pipe diameter required? A) 1‑inch B) 1½‑inch C) 2‑inch D) 3‑inch Answer: B Explanation: The UPC tables assign a minimum 1½‑inch pipe for a branch with a DFU of 2, ensuring sufficient capacity. Question 19. Cleanouts for a 4‑inch DWV pipe must be located: A) Within 6 ft of each fixture outlet B) No more than 10 ft from the nearest trap C) Within 5 ft of every change in direction greater than 90° D) At the highest point of the system only Answer: B
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Explanation: The code requires a cleanout within 10 ft of the furthest outlet of a pipe segment, not necessarily at every fixture. Question 20. An air gap for a dishwasher must be at least: A) ½‑inch B) 1‑inch C) 2‑inch D) 3‑inch Answer: C Explanation: The UPC specifies a minimum 2‑inch vertical separation between the dishwasher’s discharge outlet and the receiving fixture to create a proper air gap. Question 21. Which of the following is considered an “indirect waste” fixture? A) Kitchen sink with a grease interceptor B) Bathroom sink draining directly into a stack C) Dishwasher draining into a stand‑pipe without a trap D) Laundry tub with a direct vent to the outdoors Answer: A Explanation: Indirect waste fixtures discharge into a separate receptacle (e.g., a grease interceptor) before joining the drainage system. Question 22. The minimum size of a grease trap required for a restaurant serving 120 meals per day is: A) 10 gal B) 30 gal C) 75 gal
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B) 4 feet C) 6 feet D) 8 feet Answer: C Explanation: For a 2‑inch pipe, the critical distance is 6 feet; beyond this, the vent must be placed closer to avoid siphonage. Question 26. In an isometric drawing, a symbol consisting of a solid circle with “V” inside denotes: A) Vent stack B) Valve C) Vent cap D) Vacuum breaker Answer: A Explanation: The UPC symbol for a vent stack is a solid circle with a “V” to differentiate it from other pipe symbols. Question 27. When sketching a residential DWV system, the minimum slope for a 2‑inch branch serving a bathroom sink is: A) 1/8 inch per foot B) 1/4 inch per foot C) 3/8 inch per foot D) No slope required for 2‑inch pipe Answer: A Explanation: For 2‑inch DWV pipe, the code allows a reduced slope of 1/8 inch per foot, sufficient for low‑flow fixtures like sinks.
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Question 28. A three‑story building has a total DFU of 150. What minimum diameter is required for the main building drain? A) 3‑inch B) 4‑inch C) 6‑inch D) 8‑inch Answer: C Explanation: The UPC table for building drains shows that a DFU of 150 requires a minimum 6 ‑inch pipe to handle the cumulative load. Question 29. According to South Dakota amendments, a removable fixture trap may be used as a cleanout equivalent in which situation? A) When the pipe is concealed behind a wall and less than 6 ft from the nearest fixture B) Only in commercial kitchen grease lines C) In all residential applications without restriction D) When the pipe diameter is 3 inches or larger Answer: A Explanation: The state amendment allows a removable trap to serve as a cleanout when the pipe is concealed and within 6 ft of the nearest fixture, simplifying access. Question 30. Which plastic piping material is expressly permitted for above‑ground water distribution in South Dakota, despite the national code’s restriction? A) Polypropylene (PP‑R) B) Polybutylene (PB) C) Cross‑linked polyethylene (PEX‑a) D) PVC‑Schedule 40 Answer: C
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D) 5 inches Answer: C Explanation: The UPC requires a minimum 4‑inch water seal for floor drains in mechanical rooms to prevent sewer gases. Question 34. The required clearance between a vent termination and a building’s air intake opening is: A) 5 feet B) 10 feet C) 15 feet D) 20 feet Answer: B Explanation: To avoid contaminating the intake, vent terminations must be at least 10 feet away from any air intake opening. Question 35. When sizing a vent for a 3‑fixture bathroom group (total DFU = 6), the minimum vent pipe diameter is: A) 1‑inch B) 1½‑inch C) 2‑inch D) 3‑inch Answer: B Explanation: The vent sizing tables indicate that a DFU of 6 requires at least a 1½‑inch vent pipe. Question 36. An air admittance valve (AAV) may be used in South Dakota plumbing systems under which condition? A) Only for venting wet‑wall traps in residential bathrooms
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B) Anywhere a traditional vent cannot be installed, provided the system is sealed C) Only in commercial kitchen grease lines D) AAVs are prohibited statewide Answer: B Explanation: The state permits AAVs as an alternative when a conventional vent is impractical, as long as the system is otherwise properly sealed. Question 37. The minimum pipe size for a main water supply serving a 2‑family dwelling with a peak demand of 35 WSFU is: A) ¾‑inch B) 1‑inch C) 1¼‑inch D) 1½‑inch Answer: C Explanation: According to Hunter’s Curve, a demand of 35 WSFU requires at least a 1¼‑inch service pipe. Question 38. Which of the following is the correct method for testing a vent pipe for leaks in South Dakota? A) Fill the pipe with water and check for drips B) Use a peppermint oil test with 2 oz of oil and a smoke pencil C) Apply a pressure gauge to 150 psi and listen for hissing D) Perform a visual inspection only Answer: B Explanation: South Dakota allows a peppermint oil test (2 oz) combined with a smoke pencil to identify leaks in vent piping.
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Explanation: RPZ assemblies offer the highest protection because they incorporate a relief valve that discharges when pressure drops. Question 42. In South Dakota, the minimum distance between a vent stack and a building’s roof edge is: A) 6 inches B) 12 inches C) 18 inches D) 24 inches Answer: C Explanation: The state follows the UPC requirement of a minimum 18‑inch projection above the roof. Question 43. A 2‑inch DWV pipe that passes through a fire‑resistive wall must be protected with: A) A firestop seal of the same material as the pipe B) A 2‑hour fire‑rated sleeve C) No protection if the pipe is PVC D) A steel plate of at least ¼‑inch thickness Answer: B Explanation: The code requires a fire‑rated sleeve (minimum 2‑hour rating) for any pipe penetrating a fire‑resistive wall. Question 44. The maximum allowable length of a horizontal vent that serves a trap located 5 feet from the fixture is: A) 4 feet B) 6 feet
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C) 8 feet D) 10 feet Answer: B Explanation: The critical distance for a 2‑inch pipe is 6 feet; a vent longer than this could cause siphonage. Question 45. The minimum size of a water service stop valve for a 1‑inch main supply line is: A) ½‑inch B) ¾‑inch C) 1‑inch D) 1½‑inch Answer: C Explanation: The stop valve must match the size of the pipe it controls; a 1‑inch line requires a 1 ‑inch valve. Question 46. A 3‑inch PVC drain pipe is scheduled for a building drain. What is the minimum required wall thickness (Schedule) for this application? A) Schedule 20 B) Schedule 40 C) Schedule 80 D) Schedule 120 Answer: B Explanation: The UPC mandates Schedule 40 for DWV applications unless otherwise specified. Question 47. The required minimum height of a cleanout cover above the finished floor is:
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Question 50. The minimum pipe size for a 120‑gallon grease interceptor’s inlet is: A) 2‑inch B) 3‑inch C) 4‑inch D) 6‑inch Answer: C Explanation: The UPC requires a minimum 4‑inch inlet for grease interceptors of 100 gallons or larger. Question 51. Which of the following is a permitted method for protecting a water supply line that runs through an exterior wall in South Dakota? A) Installing a foam pipe insulation only B) Using a metal sleeve with a ½‑inch clearance on each side C) Embedding the pipe in concrete without any protection D) Running the pipe in a trench with a sand bedding only Answer: B Explanation: A metal sleeve with proper clearance provides both physical protection and fire resistance, satisfying the code. Question 52. The required minimum slope for a 3‑inch horizontal drain serving a bathtub is: A) 1/8 inch per foot B) 1/4 inch per foot C) 3/8 inch per foot D) No slope required for 3‑inch pipe
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Answer: B Explanation: For pipes 3 inches or larger, the code mandates a minimum slope of 1/4 inch per foot. Question 53. A water heater’s PT‑relief valve must discharge to: A) The building’s storm drainage system B) The interior of the building, directed to a floor drain C) The exterior, at least 6 feet away from any opening D) The vent pipe stack Answer: C Explanation: The PT‑relief valve discharge must terminate outdoors, at least 6 feet from any opening, to prevent scalding and water damage. Question 54. The maximum allowable length of a single vent pipe serving a 2‑fixture bathroom group without a vent riser is: A) 4 feet B) 6 feet C) 8 feet D) 10 feet Answer: B Explanation: The critical distance for a 2‑fixture group (DFU ≈ 4) is 6 feet; longer vents require a riser or additional venting. Question 55. In South Dakota, a removable trap used as a cleanout must be accessible within how many inches of the finished floor? A) 6 inches B) 12 inches
