Machine Design
A sliding bearing which can support steady loads without any relative motion between the journal and the bearing, is called

Boundary lubricated bearing
Zero film bearing
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing

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

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
Open and crossed belt drives transmit same power

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