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

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is thrice the centrifugal tension
None of these
The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension

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