213 PPT2 Galvanic scale and Material Expansion

What does an inhibitor protect in a heating system?

• Plastic surfaces

• Steel surfaces

• Wooden surfaces

• Glass surfaces

Which metals are mentioned as being part of a plumbing system?

• Gold and silver

• Copper and LCS

• Tin and lead

• Zinc and nickel

What is a common fitting in plumbing that uses an olive to make a seal?

• Plastic fittings

• Brass compression fittings

• Rubber fittings

• Wooden fittings

Answer explanation

Brass compression fittings are commonly used in plumbing and utilize an olive (or ferrule) to create a watertight seal when tightened. This makes them ideal for connecting pipes securely.

What is the role of an electrolyte in electrolytic corrosion?

• It prevents corrosion

• It causes corrosion

• It cleans the metal

• It strengthens the metal

What is the effect of electrolytic corrosion on a galvanized pipe?

• It strengthens the pipe

• It causes the pipe to corrode

• It makes the pipe shiny

• It cools the pipe

What happens when metals are further away in the electromotive series?

• The corrosion is less reactive

• The corrosion is more reactive

• The metals become magnetic

• The metals become non-conductive

What effect does heat have on the corrosion process?

• It slows it down

• It stops it completely

• It makes the process happen faster

• It has no effect

What is the main cause of electrolytic corrosion?

• Lack of water

• Contact between different metals from an electrolyte

• Excessive heat

• Absence of air

Which metal is more likely to corrode in the presence of an electrolyte?

• Copper

• Tin

• Magnesium

• Lead

What is the effect of the electromotive series on corrosion?

• It reduces corrosion

• It increases corrosion

• It determines the reactivity of corrosion

• It has no effect