Journeyman Plumbers Exam General Plumbing Regulations 3 — Questions and Answers
Question 1: Under IPC, what is the maximum developed length of a trap arm (from trap weir to vent) for a 1-1/2 inch pipe?
- 3 feet
- 5 feet (Correct answer)
- 6 feet
- 8 feet
Correct answer: 5 feet
The IPC allows a maximum trap arm length of 5 feet for a 1-1/2 inch pipe.
Question 2: Which type of valve is required to be installed on the water supply to a water heater to allow for servicing?
- Check valve
- Gate valve or full-port ball valve (Correct answer)
- Pressure reducing valve
- Backflow preventer
Correct answer: Gate valve or full-port ball valve
A gate valve or full-port ball valve must be installed on the cold water supply to a water heater to allow isolation for service.
Question 3: Under the IPC, the maximum water pressure at any fixture in a building shall not exceed:
- 60 psi
- 80 psi (Correct answer)
- 100 psi
- 120 psi
Correct answer: 80 psi
The IPC sets 80 psi as the maximum allowable water pressure at any fixture; a pressure reducing valve must be installed if supply exceeds this.
Question 4: A plumber installs a clothes washer standpipe. Under IPC, what is the minimum height of the standpipe above the trap?
- 12 inches
- 18 inches
- 24 inches (Correct answer)
- 30 inches
Correct answer: 24 inches
IPC requires the standpipe for a clothes washer to extend at least 18 inches but not more than 42 inches above the trap.
Question 5: Which of the following materials is NOT approved for potable water supply piping under the IPC?
- Type L copper
- CPVC
- ABS pipe (Correct answer)
- PEX tubing
Correct answer: ABS pipe
ABS (acrylonitrile butadiene styrene) is a drain-waste-vent material and is not approved for potable water supply piping.
Question 6: Under IPC, what is the minimum distance a water closet centerline must be from a side wall or obstruction?
- 12 inches
- 15 inches (Correct answer)
- 18 inches
- 21 inches
Correct answer: 15 inches
The IPC requires a minimum of 15 inches from the water closet centerline to any side wall or obstruction.
Question 7: Under IPC, an interceptor or separator is required for which of the following types of facilities?
- Residential kitchens
- Commercial kitchens and food service establishments (Correct answer)
- Hotel lobbies
- Office break rooms with a single sink
Correct answer: Commercial kitchens and food service establishments
The IPC requires grease interceptors for commercial kitchens and food service facilities where grease-laden waste is discharged.
Journeyman Plumbers Exam General Plumbing Regulations 3
Under IPC, what is the maximum developed length of a trap arm (from trap weir to vent) for a 1-1/2 inch pipe?