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What is the co-efficient of friction for lubricant?

a) Cf = \(\frac{ZN}{P} \)
b) Cf = \(\frac{PN}{Z} \)
c) Cf = \(\frac{ZP}{N} \)
d) Cf = ZPN

Answer: a
Explanation: The lubricated friction depends on the operating conditions such as the sliding speed, lubricant viscosity, temperature etc. In the formula, Z is the viscosity or oil thickness, N is the surface speed and P is the pressure caused by the weight.

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