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

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Directly proportional to the applied torque and the polar moment of inertia

ANSWER DOWNLOAD EXAMIANS APP