Theory of Machine
The Klein's diagram is useful to find

Displacement of various parts
Velocity of various parts
Acceleration of various parts
Angular acceleration of various parts

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Theory of Machine
The inversion of a mechanism is

Turning its upside down
Changing of a higher pair to a lower pair
Obtained by reversing the input and output motion
Obtained by fixing different links in a kinematic chain

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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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