Machine Design
A woodruff key is

Capable of tilting in a recess milled out in the shaft
A tapered key with head at one end
Fitted in pairs at right angles
All of these

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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
Becomes minimum at an optimum speed and then increases with further increase in speed
Remains constant at all speeds

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