Railways Technical Ability Metrology and Inspection Question Bank Metrology and Inspection

  • question_answer A 60-foot gear when hobbed on a differential hobber with a two-start hob, the index change gear ratio is governed by which one of the following kinematic balance equations?

    A) 1 revolution of gear blank \[=1/60\] of hob revolutions                  

    B) 1 revolution of gear blank \[=1/60\] of hob revolutions

    C) 1 revolution of hob\[=2/60\] of hob revolutions

    D) 1 revolution of hob \[=1/60\] of blank revolutions.

    Correct Answer: C


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