Machine Design
The resilience of a bolt may be increased by

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

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Permit each leaf to act as an overhanging beam
Have variable bending moment (M) in each leaf
Make M/I constant throughout the length of the leaf
Obtain variable moment of inertia (I) in each leaf

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