ISRO Mechanical & Aerospace 2011 - Question 60

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To ensure self locking in a screw jack, it is essential that helix angle is

  • A. Larger than friction angle
  • B. None of these
  • C. Equal to friction angle
  • D. Smaller than friction angle

Answer: D. Smaller than friction angle

Explanation: Self-locking requires $\alpha < \phi$.

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