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Journeyman Plumber Exam practice questions

205 free questions with answers and explanations.

Practice test
  1. 51.A plumber is installing a water softener in a residential basement. The manufacturer's instructions state that the softener should be connected to the main water supply line before the water heater. What is the primary reason for this installation sequence?Fixtures, Faucets, and Other Appliances
  2. 52.A plumber is installing a water closet in a residential bathroom where the rough-in dimensions are critical. According to the International Plumbing Code (IPC), what is the minimum distance from the center of a water closet to any side wall or obstruction?Fixtures, Faucets, and Other Appliances
  3. 53.A plumbing inspector is reviewing plans for a new commercial building. The plans indicate that the main building sewer will connect to the public sewer system. What is the minimum required slope for a 4-inch building sewer pipe, according to common plumbing codes like the IPC?Plumbing Code and Regulations
  4. 54.A plumbing contractor is preparing to install a new water service line from the public main to a commercial building. The local plumbing code, based on the International Plumbing Code (IPC), specifies that all underground potable water service pipes must maintain a minimum horizontal distance from any building sewer or septic tank. What is this minimum horizontal separation distance?Plumbing Code and Regulations
  5. 55.A plumber is sizing a water service pipe for a commercial building. The building has a total of 150 fixture units (FU) and the available street main pressure is 60 psi. The building is 4 stories high, and the highest fixture is 40 feet above the street main connection. The code requires a minimum residual pressure of 20 psi at the highest fixture. What is the maximum allowable pressure loss due to friction and other factors in the water service pipe?Water Supply Systems
  6. 56.A plumber is installing a commercial dishwasher in a restaurant kitchen. The dishwasher's drain line must discharge through an air gap into a floor sink. The local plumbing code requires the air gap to be at least twice the effective diameter of the drain pipe. If the dishwasher's drain pipe has an effective diameter of 1 1/2 inches, what is the minimum required air gap?Fixtures, Faucets, and Other Appliances
  7. 57.A plumber is installing a water distribution system in a new home. The water supply line from the main to the house is 1-inch (25 mm) copper. According to the International Plumbing Code (IPC), what is the minimum working pressure required at the furthest fixture outlet supplied by this system, under normal operating conditions?Plumbing Code and Regulations
  8. 58.A client wants to install a new kitchen island sink. Due to the island's location, it is impossible to run a conventional vent pipe directly up through the roof or connect to a nearby vertical vent stack. Which of the following alternative venting methods is generally accepted by plumbing codes (e.g., UPC/IPC) for an island fixture?Fixtures, Faucets, and Other Appliances
  9. 59.A plumber is inspecting a new commercial building's sanitary drainage system before the final inspection. All horizontal drainage piping must be installed with a minimum uniform slope to ensure proper gravity flow. What is the minimum required slope for a 3-inch (75 mm) horizontal drainage pipe?Plumbing Code and Regulations
  10. 60.A plumber is installing a water closet in a newly constructed residential bathroom. The rough-in for the water closet is 12 inches from the finished wall. What is the minimum required distance from the center of the water closet to any side wall or obstruction?Fixtures, Faucets, and Other Appliances
  11. 61.A plumber is inspecting a newly installed back-to-back water closet connection. To prevent siphonage and ensure proper venting, which of the following reventing methods is most appropriate for this configuration, according to common plumbing codes (e.g., UPC or IPC)?Fixtures, Faucets, and Other Appliances
  12. 62.A plumber is calculating the total fixture units for a new commercial restroom. The restroom includes two water closets, two lavatories, and one floor drain. According to the Uniform Plumbing Code (UPC), what is the total drainage fixture unit (DFU) count for these fixtures?Plumbing Code and Regulations
  13. 63.A client is replacing a standard kitchen sink with a new triple-bowl sink that includes a garbage disposal in one of the bowls. The existing drain line is 1 1/2 inches. What is the minimum required drainage fixture unit (DFU) value for a kitchen sink with a garbage disposal?Fixtures, Faucets, and Other Appliances
  14. 64.A client wants to install a new hot tub on an outdoor deck. The plumber knows that a permit is required for this installation. Which of the following is NOT typically a reason why a plumbing permit is required for installing a hot tub?Plumbing Code and Regulations
  15. 65.A plumber is installing a new kitchen sink with a single basin and a garbage disposal. According to the Uniform Plumbing Code (UPC), what is the minimum trap size required for this combination?Fixtures, Faucets, and Other Appliances
  16. 66.A plumber is installing a hot water recirculation pump for a multi-story commercial building. The local plumbing code, based on the IPC, requires that all circulating hot water systems serving more than one dwelling unit or designed for recirculation must be provided with a means to automatically limit the water temperature to what maximum value?Plumbing Code and Regulations
  17. 67.A plumber is installing a PVC drainage pipe in a non-combustible commercial building. According to the International Plumbing Code (IPC), what is the maximum spacing for horizontal supports for 3-inch (75 mm) diameter PVC drainage pipe?Plumbing Code and Regulations
  18. 68.A plumber is performing a final inspection of a newly installed residential plumbing system. According to the International Plumbing Code (IPC), what is the maximum permissible lead content in plumbing materials that come into contact with potable water?Plumbing Code and Regulations
  19. 69.A plumber is inspecting a backflow prevention assembly (e.g., an RPZ or DCVA) that has been installed for several years. What is the most critical maintenance requirement for these devices to ensure their continued effectiveness?Water Supply Systems
  20. 70.A plumber is installing a dishwasher in a residential kitchen. The dishwasher manufacturer specifies a minimum water supply pressure of 20 PSI for proper operation. The building's static water pressure is 60 PSI. What is the maximum allowed length of the 1/2-inch copper supply tubing to the dishwasher before excessive pressure drop becomes a concern for the appliance?Fixtures, Faucets, and Other Appliances
  21. 71.A plumber is preparing to install new copper water distribution piping in a residential renovation. Which of the following methods is NOT an approved or common joining method for copper water tubing in potable water systems, according to most plumbing codes?Water Supply Systems
  22. 72.A plumber is installing a water-supplied appliance in a new residential construction. The local jurisdiction follows the International Plumbing Code (IPC). What is the maximum length allowed for a flexible water connector supplying a fixture or appliance?Plumbing Code and Regulations
  23. 73.A client is requesting a new high-efficiency condensing boiler installation in their commercial building. The plumber must ensure proper disposal of the condensate, which is acidic. According to plumbing codes, what is the most common and required method for treating or neutralizing acidic condensate before it enters the building's drainage system?Plumbing Code and Regulations
  24. 74.A plumber is installing a water service line from the public water main to a new single-family residence. The local plumbing code specifies that the water service line must be installed with a minimum depth of cover to protect against freezing. In a region with a typical frost line of 30 inches, what is the most common minimum burial depth for a water service line, assuming no other specific local requirements are more stringent?Water Supply Systems
  25. 75.A plumber is installing a combination waste and vent system for a series of floor drains in a commercial kitchen. This system uses a horizontal wet vent. What is the maximum number of drainage fixture units (DFUs) that a 3-inch horizontal wet vent can serve?Drainage, Waste, and Venting (DWV) Systems
  26. 76.A plumber is installing a 2-inch continuous waste and vent system for a double kitchen sink. The fixture unit load for the sink is 3 DFUs. What is the minimum size of the wet vent required for this setup?Drainage, Waste, and Venting (DWV) Systems
  27. 77.A plumber is inspecting an existing gas water heater installation. The vent connector from the water heater rises vertically 2 feet, then turns 90 degrees horizontally for 8 feet through an unoccupied attic space, and then connects to a common vent. The water heater is a Category I appliance. Which of the following conditions represents a code violation?Gas Piping
  28. 78.A plumber is installing a floor sink that receives indirect discharge from a commercial ice machine. The air gap for this indirect waste connection must be at least how many inches?Drainage, Waste, and Venting (DWV) Systems
  29. 79.A plumber is performing a water test on a newly installed DWV system. The system includes a 30-foot stack. To what height above the highest fitting or connection must the water be maintained for the test?Drainage, Waste, and Venting (DWV) Systems
  30. 80.A plumber is installing a new atmospheric vacuum breaker (AVB) on a sillcock for an outdoor hose connection. What is the minimum vertical distance the AVB's critical level (CL) must be installed above the highest point of usage or flood level rim of the fixture it serves?Water Supply Systems
  31. 81.A plumber is installing a water distribution system using PEX tubing with crimp-style connections. Which of the following statements about proper crimp ring installation is correct?Water Supply Systems
  32. 82.A plumber is installing a vacuum breaker on a supply line to a commercial kitchen fixture to prevent back-siphonage. Which of the following statements accurately describes the required installation height for a pressure vacuum breaker (PVB)?Drainage, Waste, and Venting (DWV) Systems
  33. 83.A plumber is installing a gas clothes dryer and a gas range in a residential kitchen. Both appliances will be connected using flexible appliance connectors. What is the maximum allowable length for a flexible gas appliance connector, according to most plumbing codes?Gas Piping
  34. 84.A plumber is installing a water distribution system in a new commercial building. The design calls for a main water service line that must withstand high pressures and be highly resistant to corrosion and physical damage, as it will be buried under heavy vehicle traffic areas. Which pipe material is best suited for this application?Water Supply Systems
  35. 85.A plumber is installing a gas-fired unit heater in a commercial garage. The heater has an input rating of 150,000 BTUs per hour. The gas meter is 75 feet away, and the gas pressure is 0.5 psig. The piping will be Schedule 40 steel. Using a 0.5 inches water column pressure drop, what is the minimum nominal pipe size required for this installation?Gas Piping
  36. 86.A plumber is installing a water distribution system in a new commercial office building. The system requires a reduced pressure zone (RPZ) backflow preventer. Which of the following is an essential requirement for the installation location of an RPZ assembly?Water Supply Systems
  37. 87.A plumber is installing a water service line from the municipal main to a new single-family residence. The trench for the service line must cross a sewer line. According to plumbing codes, what is the minimum vertical separation required between the top of the sewer line and the bottom of the water service line, assuming the water line is installed above the sewer line?Water Supply Systems
  38. 88.A plumber is inspecting a residential water heater installation. The water heater is installed in a garage and is equipped with a temperature and pressure (T&P) relief valve. To comply with plumbing codes, the discharge pipe from this T&P valve must terminate in which of the following manners?Water Supply Systems
  39. 89.A plumber is installing a main building drain in a commercial facility. The drain will receive discharge from a total of 150 drainage fixture units (DFUs) and has a slope of 1/8 inch per foot. What is the minimum required diameter for this building drain?Drainage, Waste, and Venting (DWV) Systems
  40. 90.A plumber is designing a DWV system for a new medical laboratory. The lab will generate corrosive chemical waste from various sinks. Which of the following materials is most suitable for the drainage piping carrying this waste?Drainage, Waste, and Venting (DWV) Systems
  41. 91.A plumber is laying out a new commercial kitchen. An indirect waste receptor is required for a commercial dishwasher. What is the minimum air gap required between the indirect waste pipe and the flood-level rim of the receptor?Drainage, Waste, and Venting (DWV) Systems
  42. 92.A plumber is installing a battery of three lavatories, each with a 1 1/2-inch trap, connected to a horizontal branch drain. The branch drain is 15 feet long. What is the minimum required size for the vent pipe serving this branch?Drainage, Waste, and Venting (DWV) Systems
  43. 93.A plumber is installing a water distribution system in a new commercial building. The building's potable water supply is subject to significant pressure fluctuations, occasionally dropping below 20 psi. Which of the following devices is most appropriate to ensure consistent water pressure throughout the building?Water Supply Systems
  44. 94.A plumber is installing a main vent stack for a 4-story building. The building's main soil stack is 4 inches in diameter. What is the minimum required diameter for this main vent stack?Drainage, Waste, and Venting (DWV) Systems
  45. 95.A plumber is installing an outdoor gas grill. The gas supply line will be run underground from the main house supply. What type of piping material is typically approved for direct burial for natural gas residential applications?Gas Piping
  46. 96.A plumber is testing a newly installed water distribution system in a multi-story building. The system is pressurized to 100 psi for the test. However, after 30 minutes, the pressure gauge reading has dropped to 95 psi, with no visible leaks. What is the most likely cause of this pressure drop without visible water leakage?Water Supply Systems
  47. 97.A plumber is installing a new natural gas furnace in a residential basement. The furnace requires a dedicated shutoff valve. According to most plumbing codes, what is the maximum distance allowed between the union or connector and the appliance shutoff valve?Gas Piping
  48. 98.A plumber is installing a relief vent for a horizontal branch drain that serves multiple fixtures. From what point on the branch drain must the relief vent be connected?Drainage, Waste, and Venting (DWV) Systems
  49. 99.A medical clinic requires a special waste system for laboratory drains that will carry corrosive chemicals. Which of the following piping materials is most suitable for this application?Drainage, Waste, and Venting (DWV) Systems
  50. 100.Which of the following materials is generally NOT approved for use as a potable water distribution pipe within a building, but IS commonly approved for drainage, waste, and vent (DWV) systems?Drainage, Waste, and Venting (DWV) Systems