21. Which one of the following metal forming processes is the earing defect associated with?
22. From a 2 m × 1.2m sheet, squares are Cut out from each of the four comers as shown in the figure and then the sides are bent to form an open box. The maximum possible volume (in m3) of the box is
23. Match the following products to their method of manufacture.
P. Seamless tubes
1. Deep drawing
Q. Aluminium toothpaste tubes
2. Stamping
R. Currency coins
3. Impact extrusion
S. Car bodies
4. Roll piercing or extrusion
| P. Seamless tubes | 1. Deep drawing |
| Q. Aluminium toothpaste tubes | 2. Stamping |
| R. Currency coins | 3. Impact extrusion |
| S. Car bodies | 4. Roll piercing or extrusion |
24. For ideal defect free deep drawability of material, it should have
25. Match the mechanical behaviour in Group 1 with the terms in Group 2.
Group 1
Group 2
P. Low cycle fatigue
1. Charpy test
Q. Creep
2. Portevin-LeChatelier effect
R. Impact toughness
3. Coffin-Manson equation
S. Stretcher strains
4. Larson-Miller parameter
5. Jominy test
| Group 1 | Group 2 |
| P. Low cycle fatigue | 1. Charpy test |
| Q. Creep | 2. Portevin-LeChatelier effect |
| R. Impact toughness | 3. Coffin-Manson equation |
| S. Stretcher strains | 4. Larson-Miller parameter |
| 5. Jominy test |
26. A wedge shaped piece of copper is plastically deformed to a plate of uniform thickness. The finest recrystallised grains will be observed at
27. In sheet metal forming, stretcher strains occur in
28. Which of the following is a typical rolling defect?
29. Earing is a defect found in steels after the following metal working operation (s)?
30. Identify the correct metal forming operations in Group 1 with the product in Group 2.
Group 1
Group 2
P. Drawing
1. Tailoring needles
Q. Cold forging
2. Beverage cans
R. Extrusion
3. Radiator caps
S. Swaging
4. Steel half domes
| Group 1 | Group 2 |
| P. Drawing | 1. Tailoring needles |
| Q. Cold forging | 2. Beverage cans |
| R. Extrusion | 3. Radiator caps |
| S. Swaging | 4. Steel half domes |