Metals and Alloying Quiz

What are the four main categories of engineering materials?

• Metals, Polymers, Ceramics, Composites
• Metals, Plastics, Glass, Composites
• Metals, Polymers, Glass, Ceramics
• Metals, Plastics, Ceramics, Composites

Why is iron considered one of the most important metals in engineering?

• It is the lightest metal
• It is used to create steel
• It is the most expensive metal
• It has the highest melting point

What is the main reason aluminum is commonly used in engineering?

• High melting point
• High strength-to-weight ratio
• Low density
• High cost

Which crystal structure is associated with copper at room temperature?

• Body-centered cubic (BCC)
• Face-centered cubic (FCC)
• Hexagonal close-packed (HCP)
• Amorphous

What is a key characteristic of metals that allows them to be strengthened by alloying?

• High density
• Crystalline structure
• Low melting point
• Amorphous structure

How does grain size affect the strength of a polycrystalline material?

• Larger grains increase strength
• Smaller grains increase strength
• Grain size has no effect
• Grain size only affects ductility

What is the primary mechanism behind plastic deformation in metals?

• Elastic stretching of atomic bonds
• Motion of dislocations
• Thermal expansion
• Phase transformation

What is the effect of adding chromium to steel?

• Increases ductility
• Provides resistance to corrosion
• Decreases melting point
• Increases density

What is the main difference between ferrous and non-ferrous alloys?

• Presence of iron
• Melting point
• Density
• Cost

What is the purpose of adding inoculants to molten metal?

• To increase melting point
• To control grain size
• To decrease density
• To improve ductility