NCCER Plumbing Module 1 Study Guide: Questions and Answers | Latest Version | 2024/2025 | Correct & Verified

NCCER Plumbing Module 1 Study Guide: Questions and Answers | Latest Version | 2024/2025 | Correct & Verified Why is proper pipe sizing important in plumbing? Proper pipe sizing ensures adequate water flow and pressure throughout the plumbing system. What tool is commonly used to cut PVC pipes? A PVC pipe cutter or a hacksaw. What is the purpose of a P-trap in a plumbing system? To prevent sewer gases from entering the building by maintaining a water seal. Why is venting important in a plumbing system? Venting allows sewer gases to escape and ensures proper drainage by preventing pressure buildup. What type of pipe is commonly used for residential water supply? 2 Copper, PEX, or CPVC pipes are commonly used for residential water supply. What is the main advantage of using PEX piping over traditional copper pipes? PEX piping is flexible, easier to install, and resistant to freezing and corrosion. Why is it necessary to test a plumbing system after installation? To check for leaks and ensure the system functions properly. What is the purpose of a shut-off valve in a plumbing system? To control the flow of water to a specific fixture or area of the plumbing system. What is the difference between a ball valve and a gate valve? A ball valve uses a rotating ball to control flow, while a gate valve uses a sliding gate. What is the function of a water meter? To measure the amount of water used in a building. Why is it important to slope drainpipes correctly? 3 To ensure wastewater flows properly and prevents blockages. What safety precautions should be taken when soldering copper pipes? Wear safety goggles, work in a well-ventilated area, and keep a fire extinguisher nearby. What is a cleanout, and why is it used in plumbing? A cleanout provides access to the plumbing system for cleaning and clearing blockages. What is the purpose of a pressure-reducing valve? To lower incoming water pressure to a safe and manageable level. What causes water hammer, and how can it be prevented? Water hammer occurs when water flow is suddenly stopped, creating pressure shockwaves; it can be prevented with water hammer arrestors. Why is backflow prevention important? To prevent contamination of the clean water supply by reversing water flow. 4 What is the function of a plumbing fixture? A plumbing fixture is a device connected to the plumbing system that uses water, such as sinks, toilets, or showers. Why is it essential to use the correct type of sealant on threaded pipe connections? To prevent leaks and ensure a secure connection. What is the purpose of a septic tank? To treat and dispose of wastewater in areas without access to a municipal sewer system. Why is insulation important for plumbing pipes in cold climates? Insulation prevents pipes from freezing and bursting in cold temperatures. What is the purpose of a water softener? To remove minerals like calcium and magnesium from water, reducing hardness and scale buildup. What tool is used to remove clogs from a drain? 5 A drain snake or auger. Why is it necessary to use a dielectric union when connecting copper and galvanized steel pipes? To prevent galvanic corrosion between dissimilar