Theory of Machine
The unbalanced primary forces in a reciprocating engine are

Balanced completely
Balanced partially
Balanced by secondary forces
Not balanced

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Theory of Machine
In a hydrodynamic journal bearing, there is

A forced 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
No lubricant between the journal and the bearing
A thick film of lubricant between the journal and the bearing

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