ME or MEng Master of Engineering Structural Analysis and Materials Science 2

Question 1

Face-centered cubic (FCC) crystal structures are generally:

Accepted Answer

Ductile and have many slip systems

Answer

Brittle and hard

Answer

Magnetic and high-strength only

Answer

Found only in ceramics

Question 2

The stress intensity factor K_I in fracture mechanics represents:

Accepted Answer

Stress amplification at a crack tip under Mode I (opening) loading

Answer

Average stress across the cross section

Answer

The yield strength reduction factor

Answer

Impact energy absorbed per unit area

Question 3

Fatigue failure in metals typically initiates at:

Accepted Answer

Surface stress concentrations or defects

Answer

The center of the cross section under tension

Answer

Grain boundaries in the bulk material

Answer

The neutral axis of a bending member

Question 4

In a simply supported beam with a central point load P and span L, the maximum bending moment is:

Accepted Answer

PL/4

Answer

PL/8

Answer

PL/2

Answer

PL

Question 5

Which heat treatment process diffuses carbon into the surface of low-carbon steel to increase surface hardness?

Accepted Answer

Carburizing

Answer

Annealing

Answer

Quenching

Answer

Normalizing

Question 6

The modulus of resilience for a material is defined as:

Accepted Answer

Stress at the proportional limit squared divided by twice the elastic modulus

Answer

Area under the stress-strain curve up to fracture

Answer

Ultimate strength times elongation to fracture

Answer

Yield strength divided by Young's modulus