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
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

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Machine Design
Spring index is

Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Indication of quality of spring
Its capability of storing energy

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