Machine Design
Turn buckle has

Left hand threads on both ends
No threads
Right hand threads on bout ends
Left hand threads on one end and right hand threads on other end

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

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

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