Machine Design
Stress concentration factor is defined as the ratio of

Nominal stress to the endurance limit
Nominal stress to the maximum stress
Maximum stress to the nominal stress
Maximum stress to the endurance limit

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

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
Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed

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