Machine Design
The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Full annealing
Process annealing
Spheroidising
Normalising

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Machine Design
Turn buckle has

No threads
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends

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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
Make M/I constant throughout the length of the leaf
Permit each leaf to act as an overhanging beam

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