Machine Design
The resilience of a bolt may be increased by

Increasing its shank diameter
Decreasing its shank diameter
Decreasing its length
Increasing its length

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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
In cross or regular lay ropes

Wires in two adjacent strands are twisted in opposite direction
Wires are not twisted
Direction of twist of wires and strands are same
Direction of twist of wires in strands is opposite to the direction of twist of strands

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