41. In fracture toughness characterised by KIC or JIC, I in the subscript indicates loading by
42. Springback in sheet metal bending depends upon
43. Match the following failure/fracture observations in Group 1 with the likely deformation/process in Group 2.
Group 1
Group 2
P. Cup and cone
1. Creep failure
Q. Beach marks
2. Brittle failure
R. Clevage
3. Normal ductile failure
S. Triple point cracking
4. Completely ductile failure
5. Fatigue failure
| Group 1 | Group 2 |
| P. Cup and cone | 1. Creep failure |
| Q. Beach marks | 2. Brittle failure |
| R. Clevage | 3. Normal ductile failure |
| S. Triple point cracking | 4. Completely ductile failure |
| 5. Fatigue failure |
44. The pressure required to maintain flow during indirect extrusion
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio
P. decreases with decreasing rate of the billet
Q. Increases with increasing extrusion ratio
R. is independent of the length of the billet
S. is independent of the extrusion ratio
45. The typical dislocation density (lines/cm2) of a hot rolled material is
46. Amongst the following equipments, the productivity is the maximum for
47. Match the loading conditions in Group 1 with the characteristics in Group 2.
Group 1
Group 2
P. Tensile
1. Barelling
Q. Compressive
2. Intergrannular cracking
R. Fatigue
3. Striations
S. Creep
4. Cup and cone
5. Earing
| Group 1 | Group 2 |
| P. Tensile | 1. Barelling |
| Q. Compressive | 2. Intergrannular cracking |
| R. Fatigue | 3. Striations |
| S. Creep | 4. Cup and cone |
| 5. Earing |
48. Extrusion pressure is proportional to
49. A 480 mm thick slab is hot-rolled using a roll of 720 mm diameter. For a coefficient of friction of 0.5, the maximum possible reduction (in mm) is
50. Determine the correctness or otherwise of the following Assertion (a) and Reason (r).
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.
Assertion: During rolling, front tension and (or) back tension are (is) employed to decrease rolling load.
Reason: Roll pressure decreases due to lowering of flow stress as a result of front tension/back tension.