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Railways NTPC (Technical Ability) Tool Engineering Question Bank Tool Engineering

  • question_answer
    In a machine tool gear box, the smallest and largest spindles are 100 rpm and 1120 rpm respectively. If there are 8 speeds in all, the fourth speed will be:

    A) 400 rpm           

    B) 280 rpm

    C) 800 rpm           

    D) 535 rpm

    Correct Answer: B

    Solution :

    \[{{\phi }^{8\,-\,1}}=\frac{1120}{100}\phi =11.2\] \[\phi =1.412\] \[{{N}_{1}}=100\,rpm,\] \[{{N}_{2}}=100\times 1.412\]  \[=\text{ }0.141.2\text{ }rpm\] \[{{N}_{3}}=141.2\times 1.412=200\] \[{{N}_{4}}=280\,rpm\]


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