Materials Science and Manufacturing Engineering Miscellaneous

Materials Science and Manufacturing Engineering Miscellaneous

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Materials Science and Manufacturing Engineering

Materials Science and Manufacturing Engineering Miscellaneous
  1. The figure shows an incomplete schematic of a conventional lathe to be used for cutting threads with different pitches. The speed gear box Us is shown and the feed gear box Us is to be placed. P, Q, R and S denote locations and have no other significance. Changes in Uv should NOT affect the pitch of the thread being cut and changes in Us should NOT affect the cutting speed.

    The correct connections and the correct placement of Us are given by








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    Taking the engineering of a conventional lathe, Uv is the back gear arrangement and Us is the feed gear box (a) and (b) are then completely wrong.
    Now if (c) is true then, if gear ratio of Uv is changed the relative velocity of spindle with respect to lead source in changed and hence pitch is changed.

    Correct Option: C

    Taking the engineering of a conventional lathe, Uv is the back gear arrangement and Us is the feed gear box (a) and (b) are then completely wrong.
    Now if (c) is true then, if gear ratio of Uv is changed the relative velocity of spindle with respect to lead source in changed and hence pitch is changed.

  1. If in a turning operation both the feed rate and the nose radius are doubled the surface finish value will be








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    Hmax1 =
    f2
    8R

    Hmax2 =
    (2f)²
    		 =
    2f²
    8 &time; (2R)8R

    High of surface roughness be doubled means surface finished hill be decreased by 50%

    Correct Option: A

    Hmax1 =
    f2
    8R

    Hmax2 =
    (2f)²
    		 =
    2f²
    8 &time; (2R)8R

    High of surface roughness be doubled means surface finished hill be decreased by 50%

  1. In twist drills.... (small/large) point angle and ...(small/large) helix angle are provided for drilling soft, low strength steel.








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    Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material

    Correct Option: D

    Small point angle large Helix angle Point angle similar to SCEA by Decreasing point angle chips become thinner and order. Helix angle related to back rake angle. Higher back rake angle gain for soft & ductile material

  1. Pure metal pose machinability problem in turning operations. The reason is the








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    Pure metals are ductile, produces long & continuous chip

    Correct Option: A

    Pure metals are ductile, produces long & continuous chip

  1. If the longitudinal feed in centreless grinding is expressed by Vf = πDN sinα, D stands for








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    Correct Option: C