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UPSC Civil Service Exam Questions - Engineering

Q1:

When the recirculation ratio in a high rate trickling filter is unity, then what is the value of the recirculation factor ?

A 1

B > 1

C < 1

D Zero

ANS:B - > 1

F = [1+R]/[1+.1R]^2.
R = 1.
So,

F = 2/1.1^2.
1.65>1