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

Process annealing
Spheroidising
Full annealing
Normalising

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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