Machine Design
The flank of the tooth is the

Surface of the tooth above the pitch surface
Surface of the top of the tooth
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle

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

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