Machine Design
A screw is said to be over hauling screw, if the

Friction angle is equal to helix angle
Efficiency of screw is 100%
Friction angle is more than helix angle
Friction angle is less than helix angle

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Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is more stretched than the outer side during the manufacturing process
It is subjected to a higher stress than the outer side
It has a lower curvature than the outer side
It is subjected to a higher cyclic loading than the outer side

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