Machine Design
Failure of a material is called fatigue when it fails

Below the elastic limit
Below the yield point
At the yield point
At the elastic limit

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Machine Design
An open belt drive is used when

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
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions

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