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

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

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed
Becomes minimum at an optimum speed and then increases with further increase in speed
Is maximum at zero speed and decreases monotonically with increase in speed

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