A screw gauge has a screw having 2 threads in  1mm. The circular scale has 50 divisions. Find the diameter of wire, if the main scale shows 6th division and the circular reads 4

A screw gauge has a screw having 2 threads in  1mm. The circular scale has 50 divisions. Find the diameter of wire, if the main scale shows 6th division and the circular reads 4

  1. A

    6.46 mm

  2. B

    3.46mm

  3. C

    6.54mm

  4. D

    3.04mm

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    Solution:

    Least count=pitchNumber of divisions=0.550=0.01 mm

    Diameter of wire=6×0.5+4×0.01=3.04mm

    Therefore, the correct answer is (D).

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