Civil Engineering - UPSC Civil Service Exam Questions - Discussion
Discussion Forum : UPSC Civil Service Exam Questions - Section 4 (Q.No. 2)
2.
If the efficiencies of BOD removal of first-stage and second-stage trickling filters are each 65.0%, then what is the overall BOD removal efficiency of these filters ?
Discussion:
6 comments Page 1 of 1.
Vicky Vikrant said:
9 years ago
Efficienct = 1 - (1 - n1)(1 - n2) = 1 - (1 - 0.65)(1 - 0.65) = 0.8775 i.e 87.75%.
Mayank said:
9 years ago
This can be solved by following this method.
= .65 + .65 * 0.35.
= .65 + .65 * 0.35.
Lara said:
8 years ago
I think the answer should be C.
Sunil kumar said:
7 years ago
Yes, C option is correct.
Rahul verma said:
2 years ago
Here; n = n1+(1-n1)n2.
(1)
Naresh kumar meena said:
5 years ago
Thanks @Mayank.
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