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A Sliding contact bearing is operating under stable condition. The pressure developed in oil film is p when the journal rotates at N r.p.m The dynamic viscosity of lubricant is $\mu$ and effective coefficient of friction between bearing and journal of diameter D is f. which one of the following statements is correct for the bearing?     

(a)  f is directly proportional to  $\mu$ and P

(b) f is directly proportional to $\mu$ and N

(c) f is inversely proportional to p and D

(d) f is directly proportional to  $\mu$ and  inversely proportional to  N

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