Theory of Machine
In a drag link quick return mechanism, the shortest link is always fixed. The sum of the shortest and longest link is

Greater than sum of other two
There is no such relationship
Less than sum of other two
Equal to sum of other two

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Theory of Machine
In a hydrodynamic journal bearing, there is

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
A thick film of lubricant between the journal and the bearing

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