Machine Design
A sliding bearing which operates without any lubricant present, is called

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

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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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