BE/B Eng Bachelor of Engineering Materials Engineering 1

Question 1

What is the crystal structure of most common metals at room temperature called?

Accepted Answer

Face-Centered Cubic (FCC), Body-Centered Cubic (BCC), or Hexagonal Close-Packed (HCP)

Answer

Most engineering metals adopt FCC (e.g., aluminum, copper), BCC (e.g., iron, tungsten), or HCP (e.g., titanium, zinc) crystal structures depending on their atomic bonding.

Question 2

What is the glass transition temperature (Tg) of a polymer?

Accepted Answer

The temperature below which a polymer transitions from a rubbery to a glassy, brittle state

Answer

Below Tg, polymer chain segments lose mobility and the material becomes rigid and brittle (glassy); above Tg, the polymer is rubbery and flexible.

Question 3

What is the purpose of alloying in metals?

Accepted Answer

To improve mechanical properties such as strength, hardness, or corrosion resistance

Answer

Alloying adds one or more elements to a base metal to alter its microstructure and enhance properties like strength, ductility, toughness, or corrosion resistance.

Question 4

What does a phase diagram for a binary alloy system show?

Accepted Answer

The equilibrium phases present at various temperatures and compositions

Answer

A binary phase diagram maps the stable phases (solid, liquid, or mixtures) present in a two-component system across a range of temperatures and compositions.

Question 5

What is the Vickers Hardness Test used to measure?

Accepted Answer

A material's resistance to permanent deformation by indentation

Answer

The Vickers hardness test presses a pyramid-shaped diamond indenter into the material surface under a defined load and measures the size of the resulting indentation to calculate hardness (HV).

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Practice Test

BE/B Eng Bachelor of Engineering Materials Engineering 1