Materials Science and Manufacturing Engineering Miscellaneous


Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering

  1. 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.


  1. 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.



  1. 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.


  1. The size of BUE in metal cutting increases with









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    NA

    Correct Option: B

    NA



  1. 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.