Machine Design
Spring index is

Its capability of storing energy
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Indication of quality of spring

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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