Machine Design
In hydrodynamic bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Grease is used for lubrication

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

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

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