Railways Technical Ability Metrology and Inspection Question Bank Metrology and Inspection

  • question_answer The tolerance specified by the designer for the diameter of a shaft is 20.00 \[\pm \] 0.025 mm. The shafts produced by three different machines A, B and C have mean diameters of 19.99 mm, 20.00 mm and 20.01 mm respectively, with same standard deviation. What will be the percentage rejection for the shafts produced by machines A, B and C?

    A) Same for the machine A, B and C since the standard deviation is same for the three machines

    B) Least for machine A

    C) Least for machine B

    D) Least for machine C.

    Correct Answer: A

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