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UPSC Civil Service Exam Questions

Q1:

Due to rise in temperature, the viscosity and unit weight of percolating fluid are reduced to 70% and 90% respectively. Other things being constant, the change in coefficient of permeability will be

A 20.0%

B 28.6%

C 63.0%

D 77.8%

ANS:B - 28.6%

Taylor's equation based on Poiseuille's law for laminar flow through the circular tube is given by

k=rμe31+ec2D

Change in the coefficient of permeability.

k1 = 0.9r0.7μe31 + ecD2.
k1k = 0.90.7 * 100 = 128.57%.

change = 28.57%.



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