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

NCCER Plumbing 1 Module 1 Questions and Answers | Latest Version | 2024/2025 | Correct & Verified What is the function of a water supply system in plumbing? The water supply system delivers clean water to fixtures and appliances for daily use. What does the drain, waste, and vent system do in plumbing? The drain, waste, and vent system removes wastewater and ensures proper airflow for the system. Why is it important to maintain proper water pressure in plumbing? Proper water pressure ensures that water flows efficiently to all parts of the plumbing system and provides reliable service. What is a plumbing fixture? A plumbing fixture is any device that uses water, such as a sink, toilet, shower, or faucet. What is a trap in plumbing? 2 A trap is a curved section of pipe designed to hold water, preventing sewer gases from entering the home. What is the difference between a supply line and a drain line? A supply line brings clean water to fixtures, while a drain line removes wastewater and waste. What type of pipe is commonly used for residential water supply? Copper and PEX pipes are commonly used for residential water supply because of their durability and resistance to corrosion. What is the purpose of a vent pipe in a plumbing system? A vent pipe allows air to enter the plumbing system, which helps wastewater flow freely and prevents pressure buildup. What is the primary material used for modern drain lines? PVC (Polyvinyl Chloride) is the primary material used for modern drain lines because it is lightweight, durable, and cost-effective. 3 Why is it necessary to slope drain lines slightly? Sloping drain lines slightly ensures that wastewater flows by gravity, preventing clogs and backups. What is the purpose of a shutoff valve in plumbing? A shutoff valve is used to stop the flow of water to a specific area or appliance, making repairs or maintenance easier. What is the process of soldering in plumbing? Soldering is the process of joining two metal pipes together using a melted metal alloy, typically lead-free solder. What are the safety precautions to take when working with plumbing tools? Safety precautions include wearing protective gear like gloves and goggles, ensuring the workspace is clean and free of hazards, and turning off the water supply. What does “backflow” mean in plumbing? Backflow occurs when water flows in the opposite direction, potentially contaminating the clean water supply. 4 Why is it important to insulate pipes in cold climates? Insulating pipes in cold climates helps prevent them from freezing and bursting during cold weather. What is the purpose of a pressure-reducing valve in plumbing? A pressure-reducing valve is used to lower water pressure to safe levels, preventing damage to pipes and appliances. How is a water heater installed in a plumbing system? A water heater is installed by connecting it to the water supply and drain lines, as well as the electrical or gas supply, according to manufacturer instructions. What type of pipe should be used for gas lines? Black steel pipe is commonly used for gas lines because