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

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making the metal to metal contact
Move towards right of the bearing making no metal to metal contact

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