Machine Design
Factor of safety for fatigue loading is the ratio of

Endurance limit to the working stress
Elastic limit to the working stress
Elastic limit to the yield point
Young's modulus to the ultimate tensile strength

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Machine Design
An open belt 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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