302-L2-1

What is the primary difference between low carbon steel and high carbon steel?

• Amount of chromium

• Amount of carbon

• Amount of nickel

• Amount of copper

Answer explanation

The primary difference between low carbon steel and high carbon steel is the amount of carbon. Low carbon steel contains less carbon, making it more ductile, while high carbon steel has a higher carbon content, increasing its hardness and strength.

Which of the following is a non-ferrous metal?

• Cast iron

• Stainless steel

• Aluminium

• Low alloy steel

Answer explanation

Aluminium is a non-ferrous metal, meaning it does not contain significant amounts of iron. In contrast, cast iron, stainless steel, and low alloy steel all contain iron, making them ferrous metals.

What is a common characteristic of thermoplastic materials?

• They are brittle

• They can be remoulded

• They are conductive

• They are magnetic

Answer explanation

A common characteristic of thermoplastic materials is that they can be remoulded when heated. This property allows them to be reshaped multiple times without significant degradation, unlike brittle materials.

Which material is known for its high tensile strength and is often used in composites?

• Glass fibre

• Lead

• Bronze

• Nickel

Answer explanation

Glass fibre is renowned for its high tensile strength, making it a popular choice in composite materials. Unlike lead, bronze, and nickel, which do not possess the same level of tensile strength, glass fibre excels in reinforcing structures.

What is the main component of brass?

• Copper and zinc

• Copper and tin

• Copper and nickel

• Copper and aluminium

Answer explanation

Brass is primarily an alloy of copper and zinc. The combination of these two metals gives brass its characteristic properties, making 'Copper and zinc' the correct answer.

Which of the following is a characteristic of ceramics?

• High ductility

• High thermal conductivity

• High brittleness

• High malleability

Answer explanation

Ceramics are known for their high brittleness, meaning they can break easily under stress. Unlike metals, they do not exhibit high ductility or malleability, and their thermal conductivity is generally lower than that of metals.

Which type of wood is typically softer and easier to work with?

• Hard wood

• Soft wood

• Composite wood

• Reinforced wood

Answer explanation

Soft wood is typically softer and easier to work with compared to hard wood, making it a preferred choice for many woodworking projects.

What is the primary alloying element in stainless steel?

• Chromium

• Zinc

• Tin

• Lead

Answer explanation

The primary alloying element in stainless steel is chromium, which provides corrosion resistance and enhances the material's strength. Other elements like zinc, tin, and lead are not primary components of stainless steel.

Which of the following is a thermosetting plastic?

• Polyethylene

• Epoxy resin

• Polypropylene

• Polyvinyl chloride

Answer explanation

Epoxy resin is a thermosetting plastic, meaning it hardens permanently when cured. In contrast, polyethylene, polypropylene, and polyvinyl chloride are thermoplastics, which can be remolded upon heating.

What is the main advantage of using titanium in engineering applications?

• High density

• High corrosion resistance

• High electrical conductivity

• High thermal expansion

Answer explanation

The main advantage of titanium in engineering is its high corrosion resistance, making it ideal for applications in harsh environments. This property ensures durability and longevity, unlike materials with high density or poor conductivity.