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Journeyman Plumber Exam practice questions

205 free questions with answers and explanations.

Practice test
  1. 151.A plumber is designing a DWV system where a portion of the horizontal drainage piping will be installed underground outside the building. Which of the following materials is generally NOT approved for underground building sewer installations?Drainage, Waste, and Venting (DWV) Systems
  2. 152.A plumber is installing a P-trap for a kitchen sink. What is the minimum trap seal depth typically required by plumbing codes?Drainage, Waste, and Venting (DWV) Systems
  3. 153.A plumber is installing a main building drain in a commercial facility. The drain will receive discharge from several fixtures, totaling 180 DFU. What is the minimum required diameter for this building drain if it has a slope of 1/8 inch per foot?Drainage, Waste, and Venting (DWV) Systems
  4. 154.A plumber is installing a water service line using Type L copper tubing. The local plumbing code specifies a minimum burial depth of 12 inches for water service lines to protect against physical damage. However, the trench depth available is only 8 inches in a specific section due to existing utilities. What is the most appropriate action the plumber should take to comply with code?Water Supply Systems
  5. 155.A plumber is sizing a vent pipe for a 3-inch horizontal branch drain that receives discharge from multiple fixtures with a total drainage fixture unit (DFU) load of 25. The vent is connected within 5 feet of the trap arm of the most distant fixture. What is the minimum diameter of the vent pipe required?Drainage, Waste, and Venting (DWV) Systems
  6. 156.A homeowner reports a persistent odor of natural gas near their gas meter and main shutoff valve outside the house. A plumber investigates and confirms a small leak at a threaded connection. After isolating the section and making the repair, what is the MOST critical safety procedure to perform before restoring gas service to the house?Gas Piping
  7. 157.A plumber is conducting a water test on a newly installed DWV system in a two-story residential building. The highest fixture served by the system is a bathtub on the second floor. To properly test the system, to what level must the water be filled?Drainage, Waste, and Venting (DWV) Systems
  8. 158.A plumber is installing a 3-inch horizontal drainage pipe. What is the maximum number of drainage fixture units (DFUs) that this pipe can serve if it has a slope of 1/8 inch per foot?Drainage, Waste, and Venting (DWV) Systems
  9. 159.A plumber is installing a water service line that will be buried underground. The trench has been dug, and the pipe is laid. Before backfilling, what is the minimum required pressure for the initial air or water pressure test of the water service piping, according to most plumbing codes?Water Supply Systems
  10. 160.A plumber is installing a water distribution system in a commercial kitchen. The local code allows the use of CPVC for hot water distribution, but the plumber is concerned about its long-term performance under continuous high-temperature conditions. What is the primary limitation of CPVC piping compared to copper or PEX for commercial hot water applications, especially above 140°F (60°C)?Water Supply Systems
  11. 161.A plumber is installing a chemical waste system in a laboratory. Which of the following materials is most appropriate for the drainage piping in this application?Drainage, Waste, and Venting (DWV) Systems
  12. 162.A plumber is installing a natural gas line for a new commercial kitchen. The gas meter is located 80 feet from the kitchen, and the total load for all appliances is 350,000 BTU/hr. The gas supply pressure is 0.5 psi (14 inches water column). Using a pressure drop of 0.5 inches water column, what is the minimum nominal pipe size required for black iron pipe if the specific gravity of the gas is 0.60?Gas Piping
  13. 163.A plumber is selecting piping material for a new hot water distribution system in a commercial laundry facility. The system will operate with water temperatures consistently above 140°F (60°C) and requires high durability against corrosion and abrasion from potential chemicals. Which of the following materials would be the most suitable choice?Water Supply Systems
  14. 164.A plumber is troubleshooting a domestic hot water recirculation system. The homeowner reports that hot water is no longer 'instant' at distant fixtures, and the recirculation pump seems to be running constantly. Upon inspection, the plumber finds that the check valve in the recirculation line is stuck in the open position. What is the most direct consequence of this check valve failure?Water Supply Systems
  15. 165.A plumber is installing a main building drain. What is the maximum distance a cleanout can be located from the upstream end of a horizontal drainage pipe?Drainage, Waste, and Venting (DWV) Systems
  16. 166.A plumber is performing a final inspection of a DWV system in a new residential construction. What is the maximum allowable pressure drop during a 15-minute air test?Drainage, Waste, and Venting (DWV) Systems
  17. 167.A plumber is installing a water distribution system in a new commercial building with multiple water closets and urinals. The local code requires that these fixtures, if supplied directly from the water distribution system, must be protected against backflow. Which type of backflow prevention assembly is typically required for a direct connection to a flush valve-type water closet or urinal?Water Supply Systems
  18. 168.When installing a new segment of black iron pipe for a natural gas system, what is the generally accepted and required method for making threaded connections to ensure a leak-free seal?Gas Piping
  19. 169.A plumber is installing a gas-fired water heater in a utility closet. The closet has a louvered door, and the appliance requires both upper and lower combustion air openings. What is the minimum required free area for each opening for proper combustion and ventilation, assuming the closet volume is sufficient and the openings are communicating with the interior of the building?Gas Piping
  20. 170.A plumber is installing a backwater valve in a building's main drain. Where should this valve typically be installed to prevent sewage from backing up into the building from the public sewer?Drainage, Waste, and Venting (DWV) Systems
  21. 171.A plumber is designing the vent system for a commercial restroom. A 4-inch main vent stack is required. What is the minimum height above the roof a vent pipe termination must be located?Drainage, Waste, and Venting (DWV) Systems
  22. 172.A plumber is installing a water distribution system for a small office building. The system includes a water softener and a hot water heater. To prevent the softened water from mixing with the cold water supply used for drinking fountains and toilets before the softener, where should the cold water branch for these fixtures ideally be taken off the main supply?Water Supply Systems
  23. 173.A plumber discovers a gas appliance that draws its combustion air from the living space and also has a draft hood. This appliance is exhibiting flue gas spillage at the draft hood. Which of the following is the MOST likely cause of this spillage?Gas Piping
  24. 174.A plumber is troubleshooting a domestic hot water system in a multi-story building where residents on upper floors report insufficient hot water flow. The building has a 100-foot rise from the main water entry to the highest fixture. What is the approximate static pressure loss due to elevation in PSI at the topmost floor?Water Supply Systems
  25. 175.A plumber is installing a main vent stack for a 6-story commercial building. The building's main soil stack is 6 inches in diameter. According to plumbing codes, what is the minimum required diameter for the main vent stack?Drainage, Waste, and Venting (DWV) Systems
  26. 176.A journeyman plumber is preparing to cut cast iron pipe in a confined space. Which of the following personal protective equipment (PPE) is most critical to prevent respiratory hazards from dust and fumes?Tools, Equipment, and Safety
  27. 177.A plumber is working on a commercial project requiring the installation of large-diameter steel pipe. Which type of pipe cutting tool is typically used to make clean, square cuts on schedule 40 steel pipe ranging from 2 to 6 inches in diameter?Tools, Equipment, and Safety
  28. 178.A plumbing crew is excavating a trench for a new sewer line. The trench is planned to be 6 feet deep and 3 feet wide. According to OSHA regulations, what is the minimum requirement for trench protection in stable rock?Tools, Equipment, and Safety
  29. 179.A plumber is using an acetylene torch to braze copper pipes. Which type of fire extinguisher should be readily available for immediate use?Tools, Equipment, and Safety
  30. 180.When working with PVC pipe and fittings, a plumber uses a specialized primer and cement. What is the primary purpose of applying the primer before the cement?Tools, Equipment, and Safety
  31. 181.A plumber is using a drain cleaning machine with a rotating cable. What is the most important personal protective equipment (PPE) to wear to prevent the cable from snagging clothing or causing injury?Tools, Equipment, and Safety
  32. 182.A plumber is installing a water heater in a cramped utility closet. To ensure proper and safe tightening of pipe connections in a limited space, which tool is best suited for this task?Tools, Equipment, and Safety
  33. 183.A plumber is preparing to enter a large underground stormwater vault for inspection. The vault has limited entry/exit, poor ventilation, and may contain standing water. Which of the following is the most appropriate initial step before entry?Tools, Equipment, and Safety
  34. 184.A plumber is working in a trench that is 5-feet deep and the soil is classified as Type C. According to OSHA regulations, what is the maximum allowable slope for the trench walls?Tools, Equipment, and Safety
  35. 185.A journeyman plumber is using a power threading machine to prepare steel pipe. Which of the following safety practices is most crucial to prevent injury during this operation?Tools, Equipment, and Safety
  36. 186.A plumber is installing a pressure vacuum breaker (PVB) on a supply line to a commercial kitchen fixture that requires backflow protection. What is the minimum required height that the critical level (CL) of the PVB must be installed above the flood level rim (FLR) of the fixture it serves?Drainage, Waste, and Venting (DWV) Systems
  37. 187.A plumbing crew is preparing to work on a municipal water main located in a trench 7 feet deep. The soil is visibly granular, easily crumbles when dry, and does not exhibit cohesive properties. According to OSHA standards, what is the maximum allowable slope for the excavation walls in this soil type?Tools, Equipment, and Safety
  38. 188.A plumber is installing a fixture trap for a commercial floor drain in a restaurant kitchen. The drain is intended to receive discharge that may contain food particles and grease. What is the minimum required trap seal depth for this application?Drainage, Waste, and Venting (DWV) Systems
  39. 189.A plumber is inspecting a newly installed 4-inch building sewer. What is the minimum required size for the cleanout fitting that serves this building sewer, according to most plumbing codes?Drainage, Waste, and Venting (DWV) Systems
  40. 190.A plumber is designing a DWV system for a new medical laboratory. The lab will generate corrosive chemical waste that requires special handling. Which of the following piping materials is most suitable for this chemical waste system?Drainage, Waste, and Venting (DWV) Systems
  41. 191.A plumber is installing a main stack vent that extends through the roof of a single-family dwelling. There is a window located on the roof directly above the vent pipe. What is the minimum required horizontal clearance between the vent terminal and any openable window, door, or other opening into the building?Drainage, Waste, and Venting (DWV) Systems
  42. 192.A plumber is installing a 3-inch horizontal branch drain that will serve three water closets and two lavatories. The water closets each have a drainage fixture unit (DFU) value of 4, and the lavatories each have a DFU value of 1. According to common plumbing codes, what is the minimum required size for the vent pipe connected to this branch drain?Drainage, Waste, and Venting (DWV) Systems
  43. 193.A journeyman plumber is tasked with removing a corroded galvanized steel union that has seized. The union is in a tight space, making it difficult to apply significant leverage. Which of the following tools is best suited for breaking loose the seized union without damaging adjacent piping or fittings?Tools, Equipment, and Safety
  44. 194.A plumber is installing a main building drain that will connect to the public sewer. The building drain will serve a total of 1200 drainage fixture units (DFU). If the drain is installed with a slope of 1/4 inch per foot, what is the minimum required diameter for this building drain?Drainage, Waste, and Venting (DWV) Systems
  45. 195.A plumber is installing a main building drain in a new commercial building. The drain will eventually connect to the public sewer system. Which of the following is the most suitable material for this underground application, considering durability, resistance to corrosion, and common code acceptance?Drainage, Waste, and Venting (DWV) Systems
  46. 196.A plumber is installing a main building drain in a commercial facility. The drain will receive discharge from fixtures totaling 300 drainage fixture units (DFU). The drain will have a slope of 1/8 inch per foot. What is the minimum required diameter for this building drain?Drainage, Waste, and Venting (DWV) Systems
  47. 197.A plumber is installing a fixture trap for a commercial dishwasher in a restaurant. The dishwasher discharges indirectly into a floor sink. What is the minimum required trap arm size for this commercial dishwasher?Drainage, Waste, and Venting (DWV) Systems
  48. 198.A plumber is installing a main vent stack for a 5-story commercial building. The building's largest soil or waste stack is 4 inches in diameter. According to most plumbing codes, what is the minimum required diameter for the main vent stack?Drainage, Waste, and Venting (DWV) Systems
  49. 199.A plumber is installing a new natural gas line in a residential home. According to most plumbing codes, what is the minimum working pressure at which the gas piping system must be tested?Gas Piping
  50. 200.A plumber is sizing a gas line for a new commercial kitchen. The kitchen includes a range with an input rating of 150,000 BTU/hr, an oven with 100,000 BTU/hr, and a water heater with 75,000 BTU/hr. All appliances are located approximately 75 feet from the gas meter. Assuming a supply pressure of 7 inches of water column and a maximum pressure drop of 0.5 inches of water column, what is the total demand for the gas line?Gas Piping