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  1. The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

    2. A.

     Hot piercing
    B.

     Extrusion
    C.

     Cold peening
    D.

     Cold heading

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    Answer : Option C

    Explanation :

    The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as Cold peening

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