Theory of Machine
Which of the following mechanisms produces mathematically an exact straight line motion?

Watt mechanism
Tchebicheff mechanism
Peaucellier's mechanism
Grasshopper mechanism

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Theory of Machine
In a hydrodynamic journal bearing, there is

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

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