ISRO Mechanical & Aerospace 2013 - Question 45

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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. smaller than friction angle
  • C. equal to friction angle
  • D. such as to give maximum efficiency in lifting

Answer: B. smaller than friction angle

Explanation: Self locking condition: \alpha < \phi.

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