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Average values of effective coefficient of friction for bearings are described below.

1. Viscosity of the oil            

2. Clearance between shaft and bearing

3. Shaft speed

Select the correct answer using the code given below:

(a) 1 and 2 only             (b) 1 and 3 only

(c)  2 and 3 only             (d) 1,2 and 3

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