What is the primary purpose of cathodic protection in engineering materials?

• To increase the electrical conductivity of metals

• To prevent corrosion by making the metal a cathode

• To enhance the aesthetic appearance of metals

• To increase the tensile strength of metals

Which of the following is a common method of cathodic protection?

• Painting the metal surface

• Using sacrificial anodes

• Applying a wax coating

• Heat treating the metal

Anodic protection is most effective for which type of metals?

• Metals that are highly reactive

• Metals that form a passive oxide layer

• Metals with high thermal conductivity

• Metals with low melting points

Which material is known for its corrosion-resistant properties?

• Mild steel

• Aluminium

• Copper

• Stainless steel

What is the main advantage of using protective coatings on metals?

• To increase the weight of the metal

• To enhance the metal's electrical properties

• To provide a barrier against environmental factors

• To improve the metal's magnetic properties

Which process involves coating a metal with a layer of zinc to prevent corrosion?

• Anodising

• Galvanisation

• Electroplating

• Passivation

What is the primary function of corrosion inhibitors?

• To increase the hardness of metals

• To slow down or prevent corrosion

• To enhance the colour of metals

• To improve the thermal conductivity of metals

Which of the following is a common type of protective coating used in engineering?

• Polyurethane paint

• Graphite powder

• Aluminium foil

• Copper wire

What is the role of a sacrificial anode in cathodic protection?

• To absorb moisture from the environment

• To corrode in place of the protected metal

• To increase the metal's tensile strength

• To enhance the metal's thermal properties

Which metal is commonly used as a sacrificial anode?

• Gold

• Zinc

• Silver

• Platinum