Free IPC Compliance and Plumbing Systems Questions and Answers 1 — Questions and Answers
Question 1: A plumbing permit is required for the replacement of which of the following?
- Water closet
- Water heater (Correct answer)
- Bathing unit
- Faucet
Correct answer: Water heater
Explanation: <br> A plumbing permit is not needed for the direct replacement of any plumbing fixture, except for a water heater. However, if a fixture location is changed, a permit is required. In other words, you can remove a toilet and replace it with a new one without the need for a permit. But, if you move the closest flange in any way, a permit is required. This is true for all plumbing fixtures.
Question 2: The provisions for licensing are determined by which of the following:
- State Board of Plumbing
- Authority having jurisdiction (Correct answer)
- Plumbing inspector
- The responsible master plumber
Correct answer: Authority having jurisdiction
Explanation: <br> The authority having jurisdiction determines the provisions for licensing. State Plumbing Boards determine requirements and provide testing of qualified applicants to become licensed. Plumbing inspectors enforce codes adopted by the AHJ.
Question 3: The minimum vertical distance from the bottom of an indirect drain line to its receptor's flood rim is __________________.
- 1" (Correct answer)
- ¾"
- ½"
- 2"
Correct answer: 1"
"Explanation: <br> The minimum vertical distance from the bottom of an indirect drain line to its receptors flood rim is 1".
Question 4: Which of the following types of fixtures can be served by a combination waste and vent system?
- Urinals
- Toilets
- Sinks (Correct answer)
- Bidets
Correct answer: Sinks
Explanation: <br> Combination-waste-and-vent (CWV) systems do not require independent vents on all fixtures. Instead of a vertical vent the fixtures approved for a CWV installation are installed with oversized drains. Due to the larger drain diameter the fixture obtains the needed air for drainage in the top section of the oversized piping. Urinals, toilets, and bidets are not allowed to be installed on CWV systems.
Question 5: You are connecting two back-to-back lavatories, two urinals and two water closets to one horizontal branch. What are the maximum number of fixtures that can be connected to a horizontal branch?
- 3
- 4
- 6
- 8 (Correct answer)
Correct answer: 8
Explanation: <br> The plumbing code allows a maximum of eight fixture connections to a horizontal branch drain. This is also called a circuit vent.
Question 6: Piping for building drains and horizontal drainage branches requires the installation of cleanouts. Spacing for these cleanouts is determined by the diameter of the drain and other factors. In this scenario, the drain pipe diameter is three inches. This drain has a running length of 40 feet. During this run the pipe takes one 90-degree turn and one 45-degree turn. How many cleanouts are required for this installation?
- 2 (Correct answer)
- 3
- 4
- 6
Correct answer: 2
Explanation: <br> Under the IPC, a cleanout is needed for every change of direction exceeding 45 degrees. Also, when there is more than one change of direction in a run of pipe, there needs to be a cleanout for every 40 feet of developed length. Using these standards, we need 1 cleanout for the 90-degree turn and 1 cleanout for the 40 feet of developed length.
Question 7: One trap arm may serve a total of how many P-traps?
- 3
- 1 (Correct answer)
- 2
- 4
Correct answer: 1
Explanation: <br> Not more than one trap is permitted on a trap arm.
Question 8: What is the typical amount of grade required per liner foot on a household drainage pipe?
- 1/8 inch
- 1/4 inch (Correct answer)
- 3/4 inch
- 1 inch
Correct answer: 1/4 inch
Explanation: <br> The amount of grade, also referred to as pitch or fall, for a drain pipe is determined by the size of the drain pipe. Master plumbers and other design professionals establish these elements of a plumbing system based on the minimum standards required by local code requirements. As a general rule of thumb, the proper amount of grade for a drain up to 4 inches in diameter is .25 inches per liner foot.
Question 9: What will result when a 4-inch pipe is reduced in size in the direction of the flow?
- The waste will travel faster which will allow for better cleaning of the pipe.
- This could cause blockage to build up at the reduction point. (Correct answer)
- This could cause slugging in the waste system.
- This will have no effect on the drainage system.
Correct answer: This could cause blockage to build up at the reduction point.
Explanation: <br> At the reduction point, because of the direction of flow, waste can build up which will result in piping system blockage.
Question 10: Flux can only be used in the brazing process when:
- Brazing copper to brass (Correct answer)
- Brazing copper to copper
- Not allowed
- Both A and B
Correct answer: Brazing copper to brass
Explanation: <br> Flux may only be used to braze dissimilar metals.
Question 11: Gas piping installed in a laundry chute ____________.
- Must be secured at maximum intervals of 6 feet
- Must be protected from damage in the normal course of use of the chute
- Is required to be installed with only vertical pipe sections
- Is a code violation (Correct answer)
Correct answer: Is a code violation
Explanation: <br> Gas piping is not allowed to be installed in laundry chutes, dumbwaiters, air-circulating ducts, or elevators. The chutes, shafts, and ducts can transport gas to various locations in a building if a leak should occur. Therefore, it is inappropriate to install gas piping in a location that could distribute gas beyond the location of the leak.
Free IPC Compliance and Plumbing Systems Questions and Answers 1
A plumbing permit is required for the replacement of which of the following?