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

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

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Machine Design
The creep in the belt is due to

Unequal extensions in the belt due to tight and slack side tensions
Effect of temperature on belt
Stresses beyond elastic limit of belt material
Material of belt

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