Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering Miscellaneous

Easy Questions
Moderate Questions
Difficult Questions

Materials Science and Manufacturing Engineering

Materials Science and Manufacturing Engineering Miscellaneous
  1. Grinding ratio is defined as Volume of wheel wear








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    Volume of work material removed
    Volume of wheel wear

    Correct Option: B

    Volume of work material removed
    Volume of wheel wear

  1. The binding material used in cemented carbide cutting tools is








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    Cobalt used as a binding agent in cemented carbide tool. which increases the grain size transverse rapture strength increases & hot hardness decreases.

    Correct Option: D

    Cobalt used as a binding agent in cemented carbide tool. which increases the grain size transverse rapture strength increases & hot hardness decreases.

  1. During turning of a low carbon steel bar with TiN coated carbide insert, one needs to improve surface finish without sacrificing material removal rate. The achieve improved surface finish one should








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    By increasing nose radius, surface finish increases.

    Hmax =
    f2
    8R

    Hmax ↓ R ↑

    Correct Option: B

    By increasing nose radius, surface finish increases.

    Hmax =
    f2
    8R

    Hmax ↓ R ↑

  1. Consider the following statements: The helical flute in a twist drill provides the necessary
    1. Clearance angle for the cutting edge.
    2. Rake angle for the cutting edge.
    3. Space for the chip to come out during drilling.
    4. Guidance for the drill to enter into the work piece.
    Which of the statements given above are correct?








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    Helical provide rake angle which is zero at centre and increase to helical angle at the periphery form which space chips are coming out.

    Correct Option: B

    Helical provide rake angle which is zero at centre and increase to helical angle at the periphery form which space chips are coming out.

  1. A Φ–20 mm through hole is to be drilled in a 30 mm thick plate using a double fluted, 120° lip angle drill. The drill tip is at a distance of 3 mm from the plate surface when cutting is started and an over travel of 2 mm is recommended as a margin to ensure drilling through the full thickness of the plate. If the drill rotates at 500 rev/min and the feed per tooth is 0.01 mm, the machining time of the operation (in min) will be








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    D = 20 mm
    Plate thickness = 30 mm
    Double fluted
    AP = 3 mm
    OR = 2 mm
    N = 500 rpm
    Feed/tooth = 0.01 mm

    Total travel distance = 30 + 3+ 2 + 0.25 × 20 = 45 mm
    Double fluted = so feed = 0.01×2 = 0.02 mm
    Machining time

    =
    L
    		=
    45
    		= 4.5 min
    fN0.02 × 500

    Correct Option: A

    D = 20 mm
    Plate thickness = 30 mm
    Double fluted
    AP = 3 mm
    OR = 2 mm
    N = 500 rpm
    Feed/tooth = 0.01 mm

    Total travel distance = 30 + 3+ 2 + 0.25 × 20 = 45 mm
    Double fluted = so feed = 0.01×2 = 0.02 mm
    Machining time

    =
    L
    		=
    45
    		= 4.5 min
    fN0.02 × 500