Materials and densities

What are the 3 most common pipework materials used in plumbing?

The coefficient of linear expansion for copper is 0.000016, but what does this mean?

• How much a material shrinks

• How much a material doubles in size

• How much a materials length changes

• How much a material desolves

What grade are straight lengths of copper used predominantly in plumbing?

• R250

• R220

• R290

• R320

What colour signifies that a pipe is carrying gas?

• Green

• Blue

• White

• Yellow

What are the 3 grades of LCS and their colours?

Polybutylene is micro-porous, what does this mean?

What is this?

• Maximum density polyethylene

• Medium durability polyethylene

• Medium density polyethylene

• Moisture defying polyethylene

MDPE pipe supplying domestic houses is now commonly what size?

• 20mm

• 25mm

• 28mm

• 30mm

What is the name of the fitting required if you have to connect on to an old lead pipe?

On earth, gravity is....

• 9.81N

• 8.19n

• 8.91n

• 9.18n