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UPSC Civil Service Exam Questions - Engineering

Q1:

In a circular sewer of diameter D, if the depth of flow is D/4, what is the wetted perimeter equal to ?

A πD/4

B πD/2

C πD/3

D 2πD/3

ANS:C - πD/3

d/D = 1/2(1-cosa/2)
Cosa/2 =1/2
a=120*
p= pi * D *a /360
p = pi *D/3