Machine Design
When a metal or alloy is cold worked,

Both (A) and (B)
It is worked below recrystallization temperature
Its hardness and strength increases
None of these

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

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

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