31. The relation between dendrite arm spacing (x) and the solidification time (t) is given by (A and n are constants)
32. The hardenability of steels decreases with
33. The angle between the line vector and the burgers vector of an edge dislocation is
34. Which of the following cooling curves (shown in schematic) in an eutectoid steel will produce 50% bainitic structure?
35. At 910°C γ-Fe transforms to α - Fe resulting in a percentage volume expansion of
36. The boundary line between (liquid) and (liquid+solid) regions is called
37. Metal A nucleates as a spheres in a melt. Assuming Y(liquid/solid surface energy) = 200mJ/m2 and ΔGv (change in volume free energy) = -108 J/M3 the critical radius (in nm) for stable nuclei is
38. Two Cu-Ni alloys, one with 47 wt.% Ni and the other with 53 wt.% Ni, are kept in separate crucibles and are allowed to equilibrate at the same-temperature T1 between the liquidus and the solidus. The two alloys have
39. Match the following.
Gruop-I
Gruop-II
P. Line defect
1. Vacancy
Q. Point defect
2. Grain boundary
R. Area defect
3. Voids
S. Volume defect
4. Dislocations
| Gruop-I | Gruop-II |
| P. Line defect | 1. Vacancy |
| Q. Point defect | 2. Grain boundary |
| R. Area defect | 3. Voids |
| S. Volume defect | 4. Dislocations |
40. The primary strengthening mechanism in 70 : 30 brass is
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