Which one of the following metal forming processes is the earing defect associated with?
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Metallurgical Engineering · all questionsMechanical Metallurgy
Mechanical Metallurgy
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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
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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 |
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For ideal defect free deep drawability of material, it should have
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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 |
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A wedge shaped piece of copper is plastically deformed to a plate of uniform thickness. The finest recrystallised grains will be observed at
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In sheet metal forming, stretcher strains occur in
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Which of the following is a typical rolling defect?
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Earing is a defect found in steels after the following metal working operation (s)?
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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 |
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For the manufacture of thin foil of aluminium, the following rolling mill is used:
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If a cylindrical billet of height 1.0 m and diameter 0.5 m is upset forged to form a cylindrical pancake of height 0.25 m, the diameter of the pancake (in m) is
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The most serious manufacturing defect from fracture toughness point of view is
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Match the processes given in Group 1 with corresponding typical defects in Group 2.
| Group 1 | Group 2 |
| P. Forging | 1. Alligatoring |
| Q. Rolling | 2. Cold shut |
| R. Deep drawing | 3. Chevron Cracks |
| S. Extrusion | 4. Wrinkles |
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Match the deformation processes in Column I with the corresponding stress states listed in Column II.
| Column I | Column II |
| P. Wire Drawing | 1. Direct Compression |
| Q. Forging | 2. Indirect Compression |
| R. Stretch Forming | 3. Tension |
| S. Cutting | 4. Shear |
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Match the fracture processes in Group 1 to the fracture surface morphologies in Group 2.
| Group 1 | Group 2 |
| P. Ductile fracture | 1. Clevage |
| Q. Brittle fracture | 2. Dimples |
| R. Fatigue fracture | 3. Striations |
| 4. Veins |
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The maximum possible reduction in a single pass for cold rolling of a 200 mm slab is (given the co-efficient of friction 0.1 and roll diameter is 400 mm) . . . . . . . . mm.
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Patenting process is a
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Match the following components with their method of production.
| P. Automobile crankshaft | 1. Powder metallurgy |
| Q. Boiler drum | 2. Submerged arc welding |
| R. Tungsten | 3. Extrusion |
| S. Seamless tube | 4. Forging |
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A steel plate of 10 mm thickness is to be cold rolled. The mill has rolls of diameter 72 mm. If the co-efficient of friction μ = 0.3 the maximum possible thickness reduction in the first pass will approximately be . . . . . . . . %.
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