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Railways NTPC (Technical Ability) Metal Forming, Casting and Cutting Question Bank Metal Forming

  • question_answer
                       A blank of 30 mm diameter is to be produced out of 10 mm thick sheet on a simple die. If 6% clearance is recommended, then the nominal diameters of die and punch are respectively:                 

    A) 30.6 mm and 29.4 mm              

    B) 30.6 mm and 30 mm                  

    C) 30 mm and 29.4 mm                   

    D) 30 mm and 28.8 mm    

    Correct Answer: C

    Solution :

    In banking operation, clearance is provided on punch. Here clearance \[=6\times \frac{10}{100}=0.6=0.6\,mm\] Punch size \[=30-0.6=29.4\,mm\]


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