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

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Mr. Dubey

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Q. In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

(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

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✅ Correct Answer: (D) Becomes minimum at an optimum speed and then increases with further increase in speed

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