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 maximum at zero speed and decreases monotonically with increase in speed
Is minimum at zero speed and increases monotonically with increase in speed

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Machine Design
A tap bolt

Has both the ends threaded
Has a head on one end and a nut fitted to the other
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined

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