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

Globe valve

Answer

Needle valve

Answer

Butterfly valve

Question 2

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

Accepted Answer

Sweat (solder) fitting or press fitting

Answer

Solvent welding

Answer

Crimping

Answer

Compression coupling only

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

1 inch

Answer

6 inches

Answer

12 inches

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 type of water softener

Answer

A drain collection system under a slab

Answer

A manifold for gas distribution

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

To prevent water pressure loss

Answer

To reduce water noise in walls

Answer

To meet electrical code requirements

Question 6

What is a backflow preventer and when is it required on a residential irrigation system?

Accepted Answer

A device preventing contaminated water from flowing back into the potable supply; required on all irrigation connections

Answer

A pressure booster; required when pressure is below 30 psi

Answer

A filter for irrigation water; required in hard water areas

Answer

A flow meter; required for rebate programs