Machine Design
A key way lowers

The rigidity of the shaft
The strength of the shaft
The ductility of the shaft
Both the strength and rigidity of the shaft

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

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