Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
More
More or less depending on quantum of load
Same

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

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

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