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
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open belt drive transmits more power than crossed belt drive
Open and crossed belt drives transmit same power
Crossed belt drive transmits more power than open belt drive
Power transmission does not depend upon open and crossed types of constructions

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