Machine Design
Which of the following screw thread is used for power transmission in one direction only?

Buttress threads
Square threads
Multiple threads
Acme threads

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

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