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UPSC Civil Service Exam Questions - Engineering

Q1:

A circular sewer of diameter 1 m carries storm water to a depth of 0.75 m. The hydraulic radius is approximately

A 0.3 m

B 0.4 m

C 0.5 m

D 0.6 m

ANS:A - 0.3 m

r=radius of sewer pipe.
y= depth of water.
Hydraulic radius =(ry/2y+r).
= (1*0.75)/2(0.75+1)
= 0.3 m.