Plumbing Competency Test Quiz: Trivia!

Explanation
A dialectric union is required to join copper with a galvanized pipe. This fitting is necessary because copper and galvanized pipes are made of different materials and have different properties. A dialectric union is designed to prevent the two metals from coming into direct contact, which helps to prevent corrosion and damage to the pipes. It consists of a rubber or plastic sleeve that separates the two pipes and a metal coupling that holds them together. This fitting ensures a secure and leak-free connection between the copper and galvanized pipes.

Explanation
The correct answer is 1 1/4". The diameter of a lavatory tailpiece refers to the size of the pipe that connects the sink drain to the plumbing system. In this case, the diameter is 1 1/4 inches, indicating that the tailpiece has a width of 1 1/4 inches.

Explanation
A 1 1/2" P-Trap is required for a kitchen sink. The P-Trap is a U-shaped pipe that prevents sewer gases from entering the kitchen through the sink drain. It is typically installed below the sink and connects the sink drain to the main drain line. The 1 1/2" size is commonly used for kitchen sinks as it provides sufficient drainage capacity for the water and waste generated in the kitchen.

Explanation
A trap adapter is a fitting that connects the P-trap, which is a curved pipe that prevents sewer gases from entering the building, to the drain. It is specifically designed to create a secure and leak-proof connection between the P-trap and the drain pipe. This fitting ensures that wastewater flows smoothly from the P-trap into the drain, preventing any backflow or leaks.

Explanation
The correct answer is "End Outlet Continuous Waste." This trap assembly is used when the drain is centered under one bowl of the kitchen sink. It is called "end outlet" because the outlet of the trap is located at the end, allowing the waste water to flow out. It is called "continuous waste" because it is a type of trap assembly that is designed to provide a continuous flow of waste water from the sink to the drain.

Explanation
A P-Trap is a type of plumbing trap that is designed to prevent gases from entering a home or building. It is a U-shaped pipe that is installed in the plumbing system, typically under sinks or other fixtures. The shape of the trap allows water to flow through, creating a barrier that prevents gases from the sewer or septic system from entering the building. This helps to maintain a healthy and odor-free environment inside the home or building.

Explanation
The minimum size drain for a water closet is 3". This is because a water closet, also known as a toilet, requires a larger drain size to accommodate the flow of waste and prevent clogging. A 3" drain allows for efficient drainage and reduces the likelihood of blockages. Drain sizes smaller than 3" may not be sufficient for proper waste disposal and can lead to plumbing issues.

Explanation
A combination tub/shower typically requires a drain size of 1 1/2". This size is commonly used for residential tubs and showers as it provides adequate drainage capacity for the water flow. Drain sizes larger than 1 1/2" may be used in certain cases where there is a higher volume of water flow, such as in commercial or industrial settings. However, for a standard combination tub/shower in a residential setting, a 1 1/2" drain is sufficient.

Explanation
A shower stall requires a 2" drain size. This is because the drain needs to be able to handle the volume of water that is typically used during a shower. A smaller drain size, such as 1 1/2", may not be able to handle the amount of water and could lead to clogging or slow drainage. A larger drain size, such as 3" or 4", is not necessary for a shower stall and would be excessive. Therefore, the correct answer is 2".

Explanation
A washing machine typically requires a 2" drain. This size is necessary to handle the amount of water and debris that is discharged from the machine during the washing and spinning cycles. A smaller drain size may not be able to handle the volume of water, leading to clogs and backups. A larger drain size may not be necessary and could potentially cause issues with water flow. Therefore, a 2" drain is the appropriate size for a washing machine.