Machine Design
Form coefficient of spring is

Concerned with strength of wire of spring
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy

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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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