STUPIDSID
1 (a)
Define the terms space lattice, until cell and APF.
6 M
1 (b)
Cr has an atomic radius of 0.125mm, a BCC crystal structure and an atomic weight of 52g/mol. Calculate the density. (Avogadro number is 6.023×1023).
6 M
1 (c)
Differentiate between edge and screw dislocation with neat sketches.
8 M
2 (a)
Draw the stress-strain diagram of Aluminium and explain the following properties
i) Proof stress ii) Toughness
i) Proof stress ii) Toughness
5 M
2 (b)
A 10mm aluminium alloy rod is subjected to a 6kN tensile load. If the diameter of the rod is 9mm at this load determine the engineering stress, engineering strain, true stress and true strain.
8 M
2 (c)
Distinguish between slip and twinning with neat sketch.
7 M
3 (a)
Define the following terms with sketches.
i) Fatigue limit
ii) Fatigue strength
iii) Fatigue life.
i) Fatigue limit
ii) Fatigue strength
iii) Fatigue life.
6 M
3 (b)
Explain the different stages of creep with a neat sketch of the creep curve.
8 M
3 (c)
Compare ductile and brittle fracture with neat sketches.
6 M
4 (a)
What is a solid solutions? Explain the Hume-Rothary rules for the formation of substitutional solid solution with examples.
8 M
4 (b)
Compare homogeneous and heterogeneous nucleation with sketches.
6 M
4 (c)
Write short notes on intermediate phases.
6 M
5 (a)
Give the three invariant reactions of the Fe-C system indicating the temperature and composition.
6 M
5 (b)
Explain the solidification of hypoeutectoid steel containing 0.3%C indicating the micro strictures at different stages with a neat sketch.
8 M
5 (c)
Construct a phase diagram for two metals completely soluble in the liquid state but partially soluble in the solid state. Give any two examples.
6 M
6 (a)
Draw the CCC diagram and explain briefly for a plain carbon eutectoid steel.
7 M
6 (b)
Explain age hardening of Al-Cu alloy with a sketch.
8 M
6 (c)
Distinguish between process annealing and speroidising with a sketch.
5 M
7 (a)
Compare SG iron, Grey cast Iron and white caste Iron with respect to composition, microstructure, properties and applications.
12 M
7 (b)
Write short notes on the following:
i) Al-Si alloys
ii) Brasses
i) Al-Si alloys
ii) Brasses
8 M
8 (a)
Define a composite. What is the role of matrix in a composite materials?
6 M
8 (b)
Explain with a neat sketch the pultrusion process or hand layup process.
8 M
8 (c)
Give three commonly used matrix materials and reinforcement fibers used in the Production of FRP'S.
6 M
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