Engineering Materials and Their Properties

The video introduces five classifications of engineering materials: metals, ceramics, polymers, composites, and advanced materials. It focuses on the first four, discussing their properties and examples. Metals include pure metals and alloys, with distinctions between ferrous and non-ferrous types. Ceramics are chemically bonded materials like oxides and nitrides. Polymers, often called plastics, are categorized into thermoplastics and thermosetting plastics. Composites combine materials to enhance properties, with examples like reinforced concrete and Kevlar composites.

Which of the following is NOT one of the four main classifications of engineering materials discussed in the video?

• Polymers

• Ceramics

• Advanced Materials

• Metals

What is a key characteristic of metal alloys?

• They are chemically bonded.

• They are mixtures of metals and nonmetals.

• They are always pure metals.

• They cannot be recycled.

Which of the following is a non-ferrous metal?

• Steel

• Copper

• Cast Iron

• Stainless Steel

What is a common application of silicon carbide?

• Body armor

• Grinding disks

• Electrical wiring

• Plastic bottles

Which property is NOT typical of ceramics?

• Good electrical conductivity

• Brittleness

• Resistance to scratching

• High melting points

What distinguishes thermoplastics from thermosetting plastics?

• Thermoplastics are always heavier.

• Thermosetting plastics are more flexible.

• Thermosetting plastics can be recycled.

• Thermoplastics can be remelted and reshaped.

Which of the following is a characteristic of polymers?

• High melting point

• High electrical conductivity

• High elasticity

• High density

What is a key benefit of composite materials?

• They are made of a single material.

• They combine properties of parent materials.

• They are always more expensive.

• They are always lightweight.

Which composite material is known for its use in body armor?

• Kevlar composite

• Carbon fiber reinforced polymer

• Glass fiber reinforced polymer

• Reinforced concrete

What is the main advantage of carbon fiber reinforced polymer?

• High density

• High strength-to-weight ratio

• High cost

• High electrical conductivity