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  1. The operation of making a cone-shaped enlargement of the end of a hole is known as

    2. A.

     Counter-sinking
    B.

     Counter-boring
    C.

     Trepanning
    D.

     Spot facing

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    Answer : Option A

    Explanation :

    Counter sinking is used to enlarge the upper part of (a cavity), especially by chamfering, to receive the cone-shaped head of a screw, bolt. The operation of making a cone-shaped enlargement of the end of a hole is known as Counter-sinking

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