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

  • question_answer
    The ratio of time of return stroke to time of forward stroke of a shaping machine is 0.6. The stroke is 250 mm and it makes 30 double strokes per minute. What is the overall average speed of operation?

    A) 3.75 m/min                   

    B) 5.0 m/min

    C) 7.5 m/min                     

    D) 12 m/min

    Correct Answer: C

    Solution :

    Average speed of operation \[=\frac{2NL}{{{10}^{3}}}=\frac{30\times 250}{{{10}^{3}}}\]  \[=\text{ }7.5\text{ }m/min\]


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