Machine Design
Spring index is

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

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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
Is minimum at zero speed and increases 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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