Materials Science and Manufacturing Engineering Miscellaneous
- In comparison to HSS, super HS contains higher percentage of
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Vanadium increases the wear resistance of High speed steel.
Correct Option: C
Vanadium increases the wear resistance of High speed steel.
- Most of the metal cutting heat goes into the
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Chip takes away heat from the working zone otherwise tool life and work piece surface finish would get spoiled.
Correct Option: A
Chip takes away heat from the working zone otherwise tool life and work piece surface finish would get spoiled.
- Crater wear always starts at some distance from the tool tip because at that point
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Maximum temperature at the chip tool interface is 2 – 3 mm away from cutting edge because shank provides rapid heat dissipation just below the cutting edge.
Correct Option: B
Maximum temperature at the chip tool interface is 2 – 3 mm away from cutting edge because shank provides rapid heat dissipation just below the cutting edge.
- 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.