Machine Design
Residual stress in materials

Becomes zero when external load is removed
Is always harmful
Is independent of external loads
Acts when external load is applied

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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
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
Shafts are arranged parallel and rotate in the same directions

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