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

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

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Machine Design
Coaxing is the procedure of increasing

Metal resistance to corrosion by coating
Metal strength by cycling
Metal hardness by surface treatment
Fatigue limit by over-stressing the metal by successively increasing loadings

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