Expansion of Materials in Plumbing

What is the coefficient of linear expansion for Lead?

• 0.00018

• 0.00029

• 0.000016

• 0.000011

What is the coefficient of linear expansion for Steel?

• 0.00018

• 0.00029

• 0.000016

• 0.000011

What type of metals can contribute to corrosion when in contact?

• Dissimilar metals

• Similar metals

• Precious metals

• Heavy metals

What is the relationship between the position of metals in the electromotive series and their reactivity?

• Closer metals are more reactive.

• Further away metals are more reactive.

• Position does not affect reactivity.

• Only the first metal is reactive.

What is the consequence for the most anodic metal in a dissimilar metal pair?

• It remains unchanged.

• It corrodes the least.

• It comes off worst.

• It becomes a cathode.

What is the primary factor that increases the rate of electrolytic corrosion?

• Cold temperatures

• Lack of water

• Heat

• Absence of metals

Which metal is more anodic than Aluminium?

• Magnesium

• Zinc

• Iron

• Copper

What material is a sacrificial anode typically made of in a hot water cylinder?

• Magnesium

• Copper

• Brass

• Steel

What are burrs in the context of plumbing erosion?

• Smooth surfaces on pipes

• Sharp edges left on tube ends

• Protective coatings on pipes

• Insulation materials

What is dezincification?

• A form of corrosion in plumbing systems

• A method of water purification

• A type of metal alloy

• A process of zinc production