Machine Design
In hydrodynamic bearings

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

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
None of these
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction

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