Machine Design
Slenderness ratio is the ratio of

Width of column to depth of column
Effective length of column to least radius of gyration of the column
Effective length of column to width of column
Maximum size of column to minimum size of column

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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 maximum at zero speed and decreases monotonically with increase in speed
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

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