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  1. During hot working of metals

    2. A.

     Porosity of the metal is largely eliminated
    B.

     Grain structure of the metal is refined
    C.

     Mechanical properties are improved due to refinement of grains
    D.

     All of the above

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    Answer : Option D

    Explanation :

    During hot working of metals the Porosity of the metal is largely eliminated and Grain structure of the metal is refined and Mechanical properties are improved due to refinement of grains

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