NCCER Module 6 Plumbing Questions
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the primary purpose of a plumbing vent system?
✔✔ A plumbing vent system allows air to enter the pipes, preventing vacuums that could disrupt
the flow of wastewater and gases from escaping.
What are the common materials used for plumbing pipes?
✔✔ Common materials include PVC, copper, PEX, and galvanized steel, each serving different
purposes based on the installation needs.
Why should you use a pipe wrench when working with plumbing pipes?
✔✔ A pipe wrench provides a secure grip on pipes, preventing damage during installation or
removal while allowing for high torque.
What does the term “slope” refer to in plumbing?
✔✔ Slope refers to the slight incline of drain pipes that helps wastewater flow towards the sewer
system by gravity.
1
, What’s the purpose of a trap in a plumbing system?
✔✔ A trap holds a small amount of water to block sewer gases from entering the building,
maintaining a seal in the drain system.
What type of pipe is commonly used for water supply lines?
✔✔ Copper and PEX are commonly used for water supply lines due to their durability,
flexibility, and resistance to corrosion.
How can you tell if a pipe is clogged?
✔✔ Signs of a clogged pipe include slow drainage, gurgling sounds, and foul odors coming from
the drain.
What is the function of a pressure reducing valve (PRV)?
✔✔ A PRV controls and reduces water pressure to a safe level, protecting plumbing fixtures and
pipes from damage.
Why should pipe insulation be used in cold climates?
✔✔ Insulating pipes in cold climates prevents freezing, which can cause pipes to burst and cause
costly damage.
2
and Answers | Latest Version | 2024/2025
| Correct & Verified
What is the primary purpose of a plumbing vent system?
✔✔ A plumbing vent system allows air to enter the pipes, preventing vacuums that could disrupt
the flow of wastewater and gases from escaping.
What are the common materials used for plumbing pipes?
✔✔ Common materials include PVC, copper, PEX, and galvanized steel, each serving different
purposes based on the installation needs.
Why should you use a pipe wrench when working with plumbing pipes?
✔✔ A pipe wrench provides a secure grip on pipes, preventing damage during installation or
removal while allowing for high torque.
What does the term “slope” refer to in plumbing?
✔✔ Slope refers to the slight incline of drain pipes that helps wastewater flow towards the sewer
system by gravity.
1
, What’s the purpose of a trap in a plumbing system?
✔✔ A trap holds a small amount of water to block sewer gases from entering the building,
maintaining a seal in the drain system.
What type of pipe is commonly used for water supply lines?
✔✔ Copper and PEX are commonly used for water supply lines due to their durability,
flexibility, and resistance to corrosion.
How can you tell if a pipe is clogged?
✔✔ Signs of a clogged pipe include slow drainage, gurgling sounds, and foul odors coming from
the drain.
What is the function of a pressure reducing valve (PRV)?
✔✔ A PRV controls and reduces water pressure to a safe level, protecting plumbing fixtures and
pipes from damage.
Why should pipe insulation be used in cold climates?
✔✔ Insulating pipes in cold climates prevents freezing, which can cause pipes to burst and cause
costly damage.
2
