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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

ANSWER DOWNLOAD EXAMIANS APP