Question $2$

a$)$ Highlight two properties and two common uses of the following materials:

Metals,

Polymers, and

$[4]$

Ceramics.

$[4]$

b$)$ With the aid of examples explain how heat treatment is used to control the properties of engineering materials.

$[9]$

c$)$ Alloying elements are elements added to control the matrix microstructure of engineering metals. Outline two alloying elements highlighting their effects when added to metals.

Question $3$

a$)$ With the aid of examples explain how Ashby charts $($Figure Q$3$a$)$ are used to select suitable engineering material.

$12$

Figure Q$3$a: Ashby Chart

b$)$ With the aid of examples explain how the Galvanic Table is effective when selecting engineering materials for assembly design.

$[13]$

Question $4$

a$)$ With the aid of sketches$/$diagrams explain the following processes:

$\frac{3}{3}$

Investment casting,

$[5]$

Sand casting,

$[5]$

Permanent casting, and

$[5]$

Centrifugal casting.

$[5]$

b$)$ With the aid of sketches explain the principle of operation of the following:

Compound die, and

$[3]$

Progressive die.

$[2]$