Machine Design
In skew bevel gearing, the axes of shafts are

Non-intersecting and non-parallel and the teeth are straight
Intersecting and the teeth are curved
None of these
Non-intersecting and nonparallel and the teeth are curved

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

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