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Question
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing
Options:
A .  remains constant at all speeds
B .  is minimum at zero speed and increases monotonically with increase in speed
C .  is maximum at zero speed and decreases monotonically with increase in speed
D .  becomes minimum at an optimum speed and then increases with further increase in speed
Answer: Option D
Answer: (d).becomes minimum at an optimum speed and then increases with further increase in speed

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