Materials Science and Manufacturing Engineering Miscellaneous


Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering

  1. A 30 mm hole shaft assembly results in minimum and maximum clearances of 0.03 mm and 0.30 mm respectively. The hole has a unilateral tolerance with zero fundamental deviation. If the tolerance on the shaft is 0.08 mm, the maximum size of the hole is









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    Min. clearance
    = Holemin – Shaftmax = 0.03 .......(i)
    Max clearance
    = Holemin – Shaftmax = 0.30 ............(ii)
    Shaftmax – Shaftmin = 0.08 ...............(iii)
    Since, hole has unilateral tolerance,
    Hmin = 30 mm
    From eq. (i), we get
    Shaftmax = 30 – 0.03 = 29.97 min
    From eq. (iii), we get
    Shaftmin = 29.89 mm
    From eq. (ii), we get
    Holemax = 30.19 mm

    Correct Option: C

    Min. clearance
    = Holemin – Shaftmax = 0.03 .......(i)
    Max clearance
    = Holemin – Shaftmax = 0.30 ............(ii)
    Shaftmax – Shaftmin = 0.08 ...............(iii)
    Since, hole has unilateral tolerance,
    Hmin = 30 mm
    From eq. (i), we get
    Shaftmax = 30 – 0.03 = 29.97 min
    From eq. (iii), we get
    Shaftmin = 29.89 mm
    From eq. (ii), we get
    Holemax = 30.19 mm


  1. A shaft of diameter 20−0.10+0.20 mm and a hole of diameter 20+0.20 +0.10mm when assembled would yield.









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    NA

    Correct Option: C

    NA



  1. In an interference microscope, a groove produces a band distortion of 4 band spacing. If the wave length of the monochromatic light source is 0.5 microns, the groove depth is.... mm









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    Groove depth =
    h
    .
    λ
    =
    4
    ×
    0.5
    μm = 0.5μm
    2222

    Correct Option: A

    Groove depth =
    h
    .
    λ
    =
    4
    ×
    0.5
    μm = 0.5μm
    2222


  1. The combination of slip gauges to obtain a dimension of 10.35 mm will be









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    Normally, slip gauge box set does not have slip of less than 1 mm thickness. Always use minimum number of slipgauges in combination & less than 1mm thickness is not in set.

    Correct Option: B

    Normally, slip gauge box set does not have slip of less than 1 mm thickness. Always use minimum number of slipgauges in combination & less than 1mm thickness is not in set.



  1. Outside diameter of bush is turned using a mandrel. The mandrel diameter is maintained as 0.000 0.050 30.000−0.0500.000 mm and the bore diameter is 30.000−0.0000.050 mm. The maximum value in mm of the eccentricity on the bush due to the locating mandrel









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    Maximum size of Bore = 30.050mm
    Minimum size of Mandrel = 29.95mm
    Diametral Gap = 0.1mm

    Eccentricity =
    0.1
    = 0.05 mm
    2

    Correct Option: A

    Maximum size of Bore = 30.050mm
    Minimum size of Mandrel = 29.95mm
    Diametral Gap = 0.1mm

    Eccentricity =
    0.1
    = 0.05 mm
    2