Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

Perpendicular to the link joining the points
At 45° to the link joining the points
Parallel to the link joining the points
None of the listed here

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Theory of Machine
In a hydrodynamic journal bearing, there is

A thick film of lubricant between the journal and the bearing
No lubricant between the journal and the bearing
A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
A forced lubricant between the journal and the bearing

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