Machine Design
The bending stress in a curved beam is

Maximum at the neutral axis
Zero at the centroidal axis
Zero at the point other than centroidal axis
None of these

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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 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
It has a lower curvature than the outer side

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Machine Design
A woodruff key is

A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft
All of these
Fitted in pairs at right angles

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