Machine Design
Oldham coupling is used to connect two shafts

Which are not in exact alignment
Whose axes intersect at a small angle
Which have lateral misalignment
Which are perfectly aligned

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Machine Design
Form coefficient of spring is

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

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

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

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