Machine Design
When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads

Tension
Compression
Shear
Combined loads

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

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