Efficiency of Self Locking Screws MCQ

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• The load cup of a screw jack is made separate from the head of the spindle to
  ক

  enhance the load carrying capacity of the jack

  খ

  reduce the effort needed for lifting the working load

  গ

  reduce the value of frictional torque required to be countered for lifting the load

  ঘ

  prevent the rotation of load being lifted
• While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
  ক

  both ends fixed

  খ

  both ends hinged

  গ

  one end fixed and other end hinged

  ঘ

  one end fixed and other end free.
• A screw is said to be over hauling screw, if its efficiency is
  ক

  less than 50%

  খ

  more than 50%

  গ

  equal to 50%

  ঘ

  none of the mentioned
• Screws used for power transmission should have
  ক

  low efficiency

  খ

  high efficiency

  গ

  very fine threads

  ঘ

  strong teeth
• Multiple threads are used to secure
  ক

  low efficiency

  খ

  high efficiency

  গ

  high load lifting capacity

  ঘ

  high mechanical advantage
• Which of the following screw thread is adopted for power transmission in either direction?
  ক

  Acme threads

  খ

  Square threads

  গ

  Buttress threads

  ঘ

  Multiple threads