Railways Technical Ability Metrology and Inspection Question Bank Metrology and Inspection

  • question_answer Three blocks \[{{B}_{1}},\] \[{{B}_{2}}\] and \[{{B}_{3}}\] are to inserted in cannel of width S maintaining a minimum gap of width \[T=0.125\,\,m,\] as shown in figure. For \[=\,18.75\pm 0.08\,;\,Q=25.00\pm 0.12\,;\,R=28.125\pm 0.1\]and \[S=72.35+X,\] (where all dimensions are in mm), the tolerance X is:

    A) \[+0.38\]                      

    B) \[-\,0.38\]

    C) \[+0.05\]                      

    D) \[-\,0.05\]

    Correct Answer: D

    Solution :

    Tolerance build up, \[P+Q+R+T=(18.75\pm 0.08)+(25.00\pm 0.12)+\] \[(28.125\pm 0.10)+0.125\] \[=72.000\pm 0.30\] \[72.35+X=72.00\pm 0.30\] \[X=72.30-72.35=-\,0.05\,mm\]


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