Machine Design
The strap end of a connecting rod of steam engine is joined by

Spigot socket cotter joint
Knuckle joint
Gib of cotter joint
Sleeve and cotter joint

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Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch

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