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In journal bearing design, the factor  $\frac{ZN}{P}$ is called the ‘Bearing characteristic number’ where Z= absolute viscosity of the lubricant, N = Speed  of journal in rpm and P = Bearing pressure on the projected bearing area. The value of  $\frac{ZN}{P}$ corresponding to the  Minimum amount of friction is called the bearing modulus ‘K’. For  hydrodynamic lubrication of the bearing, $\frac{ZN}{P}$  should be         

(a) Larger than K          (b) Smaller than K

(c) Equal to K               (d)  Equl to zero.

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