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

  • question_answer
    The installation cost of a machine is Rs. 2000. The cost of repairs increases Rs.  40 annual). The scrap value of the machine is Rs. 200. The economic repair life of the machine is nearly:

    A) \[5\frac{1}{2}\] Years                

    B) \[7\frac{1}{2}\] years           

    C) \[9\frac{1}{2}\] Years                

    D) \[11\frac{1}{2}\] years 

    Correct Answer: C

    Solution :

    Economic repair life, \[x={{\left[ \frac{2(C-S)}{b} \right]}^{1/2}}\] \[x={{\left[ \frac{2(200-200)}{400} \right]}^{1/2}}=9.5\,years\]


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