51. Match the terms in Group 1 to their descriptions in Group 2.
Group 1
Group 2
P. Hall-Petch effect
1. Solute dislocation interaction
Q. Bauschinger effect
2. Dislocation multiplication
R. Cottreli atmosphere
3. Grain boundary strengthening
4. Barelling under compression
5. Mechanical hysterisis during plasticity
| Group 1 | Group 2 |
| P. Hall-Petch effect | 1. Solute dislocation interaction |
| Q. Bauschinger effect | 2. Dislocation multiplication |
| R. Cottreli atmosphere | 3. Grain boundary strengthening |
| 4. Barelling under compression | |
| 5. Mechanical hysterisis during plasticity |
52. Fatigue resistance of a steel is reduced by
53. Flash in a close die forging.
54. Match the stress state with the corresponding forming process.
P. Direct compressive
1. Wire drawing
Q. Indirect compressive
2. Sheet blanking
R. Tensile
3. Forging
S. Shear
4. Stretch forming
| P. Direct compressive | 1. Wire drawing |
| Q. Indirect compressive | 2. Sheet blanking |
| R. Tensile | 3. Forging |
| S. Shear | 4. Stretch forming |
55. The spring back phenomenon in metal sheet bending can be compensated by
56. Match the items in Group 1 with the manufacturing processes in Group 2.
Group 1
Group 2
P. Upsetting operation
1. Extrusion
Q. Port hole die
2. Forging
R. Bullblock
3. Rolling
S. Orange peel effect
4. Wire drawing
5. Deep drawing
6. Sheet forming
| Group 1 | Group 2 |
| P. Upsetting operation | 1. Extrusion |
| Q. Port hole die | 2. Forging |
| R. Bullblock | 3. Rolling |
| S. Orange peel effect | 4. Wire drawing |
| 5. Deep drawing | |
| 6. Sheet forming |
57. In extrusion of metals, which of the following statement(s) is/are true?
58. Match the defects listed in Group I with the processes listed in Group II.
Group I
Group II
P. Cold Shut
1. Rolling
Q. Earing
2. Forging
R. Alligatoring
3. Deep drawing
S. Shrinkage porosity
4. Fusion welding
| Group I | Group II |
| P. Cold Shut | 1. Rolling |
| Q. Earing | 2. Forging |
| R. Alligatoring | 3. Deep drawing |
| S. Shrinkage porosity | 4. Fusion welding |
59. Match the manufacturing process of Group I to be used for producing the product for Group II.
Group I
Group II
P. Drawing
1. Large curved disc
Q. Forging
2. Tube
R. Rolling
3. Crank shaft
S. Stretch forming
4. Plate
| Group I | Group II |
| P. Drawing | 1. Large curved disc |
| Q. Forging | 2. Tube |
| R. Rolling | 3. Crank shaft |
| S. Stretch forming | 4. Plate |