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Discussion :: Tunneling

  1. The concentration of the dust particles of the size 0.5 to 5 microns adjacent to the working face should not be more than

    2. A.
    200 particles/cm3
    B.
    250 particles/cm3
    C.
    300 particles/cm3
    D.
    450 particles/cm3
    E.
    400 particles/cm3

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    Workspace

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    Answer : Option D

    Explanation :

    No answer description available for this question.

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