Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Shot peening
Hot working
Cold working
Grinding and lapping surface

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged parallel and rotate in the opposite directions
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 same directions

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