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UPSC Civil Service Exam Questions - Engineering

Q1:

A saturated clay layer with single drainage face takes 4 years to attain 50% degree of consolidation. If the clay layer had double drainage, then the time required to attain 50% degree of consolidation is

A 8 years

B 4 years

C 2 years

D 1 year

ANS:D - 1 year

For single drainage face, time (ts) = 4 years to attain 50% consolidation.
For double drainage face, time (td) = 1/4 & time taken for single drainage face to attain 50% consolidation.

td = 1/4 x 4 = 1 year.