Materials Science and Manufacturing Engineering Miscellaneous
- The size of BUE in metal cutting increases with
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NA
Correct Option: B
NA
- Two 1 mm thick steel sheets are to be spot welded at a current of 5000 A. Assuming effective resistance to be 200 micro-ohms and current f low time of 0.2 second, heat generated during the process will be
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Heat generated during the process = i2R∆t
Heat generated during the process = (5000)2 × (200 × 10–6) × 0.2 = 1000 Joules.Correct Option: D
Heat generated during the process = i2R∆t
Heat generated during the process = (5000)2 × (200 × 10–6) × 0.2 = 1000 Joules.
- Two plates of the same metal having equal thickness are to be butt welded with electric arc. When the plate thickness changes, welding is achieved by
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Increasing the current setting increases the heat generation, so larger material Deposition takes place.
Correct Option: A
Increasing the current setting increases the heat generation, so larger material Deposition takes place.
- Preheating before welding is done to
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Due to decreased Thermal conductivity, at higher temperature less heat transportation so less thermal stresses leads to less distortion.
Correct Option: D
Due to decreased Thermal conductivity, at higher temperature less heat transportation so less thermal stresses leads to less distortion.
- The electrodes used in arc welding are coated. This is not expected to
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Coating is provided for first three options not for prevention from external contaminates.
Correct Option: D
Coating is provided for first three options not for prevention from external contaminates.
