Plumbing Water Supply Systems 3

Question 1

What type of valve is used as the main shutoff valve for a residential water supply?

Accepted Answer

Ball valve or gate valve

Answer

Ball valves or gate valves are used as main shutoff valves because they provide full-bore flow when open and a complete shutoff when closed.

Question 2

How is copper pipe typically joined in a residential water supply system?

Accepted Answer

Sweat (solder) fitting or press fitting

Answer

Copper pipe is most commonly joined using sweat (solder) fittings or press fittings, with sweat soldering being the traditional method and press fittings gaining popularity.

Question 3

What is the required minimum distance between a water supply line and a drain line when running parallel in a wall?

Accepted Answer

No minimum required

Answer

The IPC does not specify a minimum horizontal separation distance between supply and drain lines running parallel, but they must not come into contact.

Question 4

What is a manifold system in residential plumbing?

Accepted Answer

A multi-outlet distribution center that feeds individual supply lines to each fixture

Answer

A plumbing manifold is a central distribution hub, typically used with PEX, that feeds dedicated supply lines to each fixture for individual shutoff capability.

Question 5

What is the purpose of insulating water supply pipes in unconditioned spaces?

Accepted Answer

To prevent freezing and reduce heat loss from hot water lines

Answer

Insulating pipes in unconditioned spaces (attics, crawl spaces, garages) prevents freezing in cold climates and reduces heat loss from hot water supply lines.

Plumbing Practice Test

Plumbing Practice Test

Plumbing Water Supply Systems 3